Need help in troubleshooting ignition problem
 

My 95 Grand Cherokee would not start today. It is not getting any ignition.
The engine turns over fine but there is no spark from spark plug wires or
from the coil. I've tested the coil with a ohmmeter and it checked out fine.
I replaced the distributor cap and rotor button, but that didn't help. I
fear it might be the Powertrain Control Module(PCM). My Haynes repair manual
does not explain how to test this. Does anyone here know? Is there something
else I should check? I have a 4.0L V6 motor.

Any suggestions would be greatly appreciated.

BTW- If it is the Powertrain Control Module, is it possible to purchase an
after-market PCM that is better? I saw this on Ebay:
http://cgi.ebay.com/ebaymotors/ws/eB...category=33597
but I don't know if it a PCM replacement or just an add on.


Steve Smith

Re: Need help in troubleshooting ignition problem
 

Hi Steve,
Ninety nine and nine tens percent of the time it is the Crankshaft
Position Sensor:
http://www.off-road.com/jeep/cheroke...tdcsensor.html
Pictured:
http://members.cox.net/wilsond/Fixes...tml#CPSdetails
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Steve Smith wrote:
>
> My 95 Grand Cherokee would not start today. It is not getting any ignition.
> The engine turns over fine but there is no spark from spark plug wires or
> from the coil. I've tested the coil with a ohmmeter and it checked out fine.
> I replaced the distributor cap and rotor button, but that didn't help. I
> fear it might be the Powertrain Control Module(PCM). My Haynes repair manual
> does not explain how to test this. Does anyone here know? Is there something
> else I should check? I have a 4.0L V6 motor.
>
> Any suggestions would be greatly appreciated.
>
> BTW- If it is the Powertrain Control Module, is it possible to purchase an
> after-market PCM that is better? I saw this on Ebay:
> http://cgi.ebay.com/ebaymotors/ws/eB...category=33597
> but I don't know if it a PCM replacement or just an add on.
>
> Steve Smith

Re: Need help in troubleshooting ignition problem
 

Hi Steve,
Ninety nine and nine tens percent of the time it is the Crankshaft
Position Sensor:
http://www.off-road.com/jeep/cheroke...tdcsensor.html
Pictured:
http://members.cox.net/wilsond/Fixes...tml#CPSdetails
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Steve Smith wrote:
>
> My 95 Grand Cherokee would not start today. It is not getting any ignition.
> The engine turns over fine but there is no spark from spark plug wires or
> from the coil. I've tested the coil with a ohmmeter and it checked out fine.
> I replaced the distributor cap and rotor button, but that didn't help. I
> fear it might be the Powertrain Control Module(PCM). My Haynes repair manual
> does not explain how to test this. Does anyone here know? Is there something
> else I should check? I have a 4.0L V6 motor.
>
> Any suggestions would be greatly appreciated.
>
> BTW- If it is the Powertrain Control Module, is it possible to purchase an
> after-market PCM that is better? I saw this on Ebay:
> http://cgi.ebay.com/ebaymotors/ws/eB...category=33597
> but I don't know if it a PCM replacement or just an add on.
>
> Steve Smith

Re: Need help in troubleshooting ignition problem
 

Hi Steve,
Ninety nine and nine tens percent of the time it is the Crankshaft
Position Sensor:
http://www.off-road.com/jeep/cheroke...tdcsensor.html
Pictured:
http://members.cox.net/wilsond/Fixes...tml#CPSdetails
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Steve Smith wrote:
>
> My 95 Grand Cherokee would not start today. It is not getting any ignition.
> The engine turns over fine but there is no spark from spark plug wires or
> from the coil. I've tested the coil with a ohmmeter and it checked out fine.
> I replaced the distributor cap and rotor button, but that didn't help. I
> fear it might be the Powertrain Control Module(PCM). My Haynes repair manual
> does not explain how to test this. Does anyone here know? Is there something
> else I should check? I have a 4.0L V6 motor.
>
> Any suggestions would be greatly appreciated.
>
> BTW- If it is the Powertrain Control Module, is it possible to purchase an
> after-market PCM that is better? I saw this on Ebay:
> http://cgi.ebay.com/ebaymotors/ws/eB...category=33597
> but I don't know if it a PCM replacement or just an add on.
>
> Steve Smith

Re: Need help in troubleshooting ignition problem
 

On Sat, 2 Apr 2005 22:29:00 -0500, "Steve Smith"
<s.w.smithREMOVECAPS@ctliving.net> wrote:

>My 95 Grand Cherokee would not start today. It is not getting any ignition.
>The engine turns over fine but there is no spark from spark plug wires or
>from the coil. I've tested the coil with a ohmmeter and it checked out fine.
>I replaced the distributor cap and rotor button, but that didn't help. I
>fear it might be the Powertrain Control Module(PCM). My Haynes repair manual
>does not explain how to test this. Does anyone here know? Is there something
>else I should check? I have a 4.0L V6 motor.
>
>Any suggestions would be greatly appreciated.
>
>BTW- If it is the Powertrain Control Module, is it possible to purchase an
>after-market PCM that is better? I saw this on Ebay:
>http://cgi.ebay.com/ebaymotors/ws/eB...category=33597
>but I don't know if it a PCM replacement or just an add on.
>
>
>Steve Smith

First check the Crankcase Position Sensor. Many a jeep owner has
cursed the *%$**!! who designed that stupid thing!

Next up I would replace the coil anyway. I've seen a perfectly good
reading come from a coil that still won't spark. Rare, but I have
seen it.

Can't think of anything else...but then again it's 4:00am (just
finished putting in a new stereo in the XJ).


Drifter
"I've been here, I've been there..."

Re: Need help in troubleshooting ignition problem
 

On Sat, 2 Apr 2005 22:29:00 -0500, "Steve Smith"
<s.w.smithREMOVECAPS@ctliving.net> wrote:

>My 95 Grand Cherokee would not start today. It is not getting any ignition.
>The engine turns over fine but there is no spark from spark plug wires or
>from the coil. I've tested the coil with a ohmmeter and it checked out fine.
>I replaced the distributor cap and rotor button, but that didn't help. I
>fear it might be the Powertrain Control Module(PCM). My Haynes repair manual
>does not explain how to test this. Does anyone here know? Is there something
>else I should check? I have a 4.0L V6 motor.
>
>Any suggestions would be greatly appreciated.
>
>BTW- If it is the Powertrain Control Module, is it possible to purchase an
>after-market PCM that is better? I saw this on Ebay:
>http://cgi.ebay.com/ebaymotors/ws/eB...category=33597
>but I don't know if it a PCM replacement or just an add on.
>
>
>Steve Smith

First check the Crankcase Position Sensor. Many a jeep owner has
cursed the *%$**!! who designed that stupid thing!

Next up I would replace the coil anyway. I've seen a perfectly good
reading come from a coil that still won't spark. Rare, but I have
seen it.

Can't think of anything else...but then again it's 4:00am (just
finished putting in a new stereo in the XJ).


Drifter
"I've been here, I've been there..."

Re: Need help in troubleshooting ignition problem
 

On Sat, 2 Apr 2005 22:29:00 -0500, "Steve Smith"
<s.w.smithREMOVECAPS@ctliving.net> wrote:

>My 95 Grand Cherokee would not start today. It is not getting any ignition.
>The engine turns over fine but there is no spark from spark plug wires or
>from the coil. I've tested the coil with a ohmmeter and it checked out fine.
>I replaced the distributor cap and rotor button, but that didn't help. I
>fear it might be the Powertrain Control Module(PCM). My Haynes repair manual
>does not explain how to test this. Does anyone here know? Is there something
>else I should check? I have a 4.0L V6 motor.
>
>Any suggestions would be greatly appreciated.
>
>BTW- If it is the Powertrain Control Module, is it possible to purchase an
>after-market PCM that is better? I saw this on Ebay:
>http://cgi.ebay.com/ebaymotors/ws/eB...category=33597
>but I don't know if it a PCM replacement or just an add on.
>
>
>Steve Smith

First check the Crankcase Position Sensor. Many a jeep owner has
cursed the *%$**!! who designed that stupid thing!

Next up I would replace the coil anyway. I've seen a perfectly good
reading come from a coil that still won't spark. Rare, but I have
seen it.

Can't think of anything else...but then again it's 4:00am (just
finished putting in a new stereo in the XJ).


Drifter
"I've been here, I've been there..."

Re: Need help in troubleshooting ignition problem
 

Bill, do V6's have that CPS? He says he has the V6.

But other than a dead CPS, how is the body ground? If bad no spark. I
test them by running a booster cable from the battery negative to the
firewall. On the straight six, the ground is a wire mesh strap from the
head to the firewall, don't know where it is on the V6 or V8.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

"L.W.(ßill) ------ III" wrote:
>
> Hi Steve,
> Ninety nine and nine tens percent of the time it is the Crankshaft
> Position Sensor:
> http://www.off-road.com/jeep/cheroke...tdcsensor.html
> Pictured:
> http://members.cox.net/wilsond/Fixes...tml#CPSdetails
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Steve Smith wrote:
> >
> > My 95 Grand Cherokee would not start today. It is not getting any ignition.
> > The engine turns over fine but there is no spark from spark plug wires or
> > from the coil. I've tested the coil with a ohmmeter and it checked out fine.
> > I replaced the distributor cap and rotor button, but that didn't help. I
> > fear it might be the Powertrain Control Module(PCM). My Haynes repair manual
> > does not explain how to test this. Does anyone here know? Is there something
> > else I should check? I have a 4.0L V6 motor.
> >
> > Any suggestions would be greatly appreciated.
> >
> > BTW- If it is the Powertrain Control Module, is it possible to purchase an
> > after-market PCM that is better? I saw this on Ebay:
> > http://cgi.ebay.com/ebaymotors/ws/eB...category=33597
> > but I don't know if it a PCM replacement or just an add on.
> >
> > Steve Smith

Re: Need help in troubleshooting ignition problem
 

Bill, do V6's have that CPS? He says he has the V6.

But other than a dead CPS, how is the body ground? If bad no spark. I
test them by running a booster cable from the battery negative to the
firewall. On the straight six, the ground is a wire mesh strap from the
head to the firewall, don't know where it is on the V6 or V8.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

"L.W.(ßill) ------ III" wrote:
>
> Hi Steve,
> Ninety nine and nine tens percent of the time it is the Crankshaft
> Position Sensor:
> http://www.off-road.com/jeep/cheroke...tdcsensor.html
> Pictured:
> http://members.cox.net/wilsond/Fixes...tml#CPSdetails
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Steve Smith wrote:
> >
> > My 95 Grand Cherokee would not start today. It is not getting any ignition.
> > The engine turns over fine but there is no spark from spark plug wires or
> > from the coil. I've tested the coil with a ohmmeter and it checked out fine.
> > I replaced the distributor cap and rotor button, but that didn't help. I
> > fear it might be the Powertrain Control Module(PCM). My Haynes repair manual
> > does not explain how to test this. Does anyone here know? Is there something
> > else I should check? I have a 4.0L V6 motor.
> >
> > Any suggestions would be greatly appreciated.
> >
> > BTW- If it is the Powertrain Control Module, is it possible to purchase an
> > after-market PCM that is better? I saw this on Ebay:
> > http://cgi.ebay.com/ebaymotors/ws/eB...category=33597
> > but I don't know if it a PCM replacement or just an add on.
> >
> > Steve Smith

Re: Need help in troubleshooting ignition problem
 

Bill, do V6's have that CPS? He says he has the V6.

But other than a dead CPS, how is the body ground? If bad no spark. I
test them by running a booster cable from the battery negative to the
firewall. On the straight six, the ground is a wire mesh strap from the
head to the firewall, don't know where it is on the V6 or V8.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

"L.W.(ßill) ------ III" wrote:
>
> Hi Steve,
> Ninety nine and nine tens percent of the time it is the Crankshaft
> Position Sensor:
> http://www.off-road.com/jeep/cheroke...tdcsensor.html
> Pictured:
> http://members.cox.net/wilsond/Fixes...tml#CPSdetails
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Steve Smith wrote:
> >
> > My 95 Grand Cherokee would not start today. It is not getting any ignition.
> > The engine turns over fine but there is no spark from spark plug wires or
> > from the coil. I've tested the coil with a ohmmeter and it checked out fine.
> > I replaced the distributor cap and rotor button, but that didn't help. I
> > fear it might be the Powertrain Control Module(PCM). My Haynes repair manual
> > does not explain how to test this. Does anyone here know? Is there something
> > else I should check? I have a 4.0L V6 motor.
> >
> > Any suggestions would be greatly appreciated.
> >
> > BTW- If it is the Powertrain Control Module, is it possible to purchase an
> > after-market PCM that is better? I saw this on Ebay:
> > http://cgi.ebay.com/ebaymotors/ws/eB...category=33597
> > but I don't know if it a PCM replacement or just an add on.
> >
> > Steve Smith

Re: Need help in troubleshooting ignition problem
 

He's dyslexic, he meant I, but typed V. The '95 Grand Cherokee V8
is the old fifties Plymouth push rod, 5.2 liter.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Mike Romain wrote:
>
> Bill, do V6's have that CPS? He says he has the V6.
>
> But other than a dead CPS, how is the body ground? If bad no spark. I
> test them by running a booster cable from the battery negative to the
> firewall. On the straight six, the ground is a wire mesh strap from the
> head to the firewall, don't know where it is on the V6 or V8.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's

Re: Need help in troubleshooting ignition problem
 

He's dyslexic, he meant I, but typed V. The '95 Grand Cherokee V8
is the old fifties Plymouth push rod, 5.2 liter.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Mike Romain wrote:
>
> Bill, do V6's have that CPS? He says he has the V6.
>
> But other than a dead CPS, how is the body ground? If bad no spark. I
> test them by running a booster cable from the battery negative to the
> firewall. On the straight six, the ground is a wire mesh strap from the
> head to the firewall, don't know where it is on the V6 or V8.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's

Re: Need help in troubleshooting ignition problem
 

He's dyslexic, he meant I, but typed V. The '95 Grand Cherokee V8
is the old fifties Plymouth push rod, 5.2 liter.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Mike Romain wrote:
>
> Bill, do V6's have that CPS? He says he has the V6.
>
> But other than a dead CPS, how is the body ground? If bad no spark. I
> test them by running a booster cable from the battery negative to the
> firewall. On the straight six, the ground is a wire mesh strap from the
> head to the firewall, don't know where it is on the V6 or V8.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's

Re: Need help in troubleshooting ignition problem
 

Steve should follow the advice given at the end of Bill's first URL
(below) -- find the 2-wire plug for the CPS driver's side near the
firewall, just behind the valve cover. Carefully unplug (don't break
the keeper off), securely replug. My `89 XJ would refuse to start about
once a year, curiously, usually just after an oil change. Unplug,
reconnect, start up and I'd be good to go another 15,000 miles or so
before it happened again. Never did have to replace the part.


L.W.(ßill) ------ III wrote:
> Hi Steve,
> Ninety nine and nine tens percent of the time it is the Crankshaft
> Position Sensor:
> http://www.off-road.com/jeep/cheroke...tdcsensor.html
> Pictured:
> http://members.cox.net/wilsond/Fixes...tml#CPSdetails
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Steve Smith wrote:
>
>>My 95 Grand Cherokee would not start today. It is not getting any ignition.
>>The engine turns over fine but there is no spark from spark plug wires or
>>from the coil. I've tested the coil with a ohmmeter and it checked out fine.
>>I replaced the distributor cap and rotor button, but that didn't help. I
>>fear it might be the Powertrain Control Module(PCM). My Haynes repair manual
>>does not explain how to test this. Does anyone here know? Is there something
>>else I should check? I have a 4.0L V6 motor.
>>
>>Any suggestions would be greatly appreciated.
>>
>>BTW- If it is the Powertrain Control Module, is it possible to purchase an
>>after-market PCM that is better? I saw this on Ebay:
>>http://cgi.ebay.com/ebaymotors/ws/eB...category=33597
>>but I don't know if it a PCM replacement or just an add on.
>>
>>Steve Smith

Re: Need help in troubleshooting ignition problem
 

Steve should follow the advice given at the end of Bill's first URL
(below) -- find the 2-wire plug for the CPS driver's side near the
firewall, just behind the valve cover. Carefully unplug (don't break
the keeper off), securely replug. My `89 XJ would refuse to start about
once a year, curiously, usually just after an oil change. Unplug,
reconnect, start up and I'd be good to go another 15,000 miles or so
before it happened again. Never did have to replace the part.


L.W.(ßill) ------ III wrote:
> Hi Steve,
> Ninety nine and nine tens percent of the time it is the Crankshaft
> Position Sensor:
> http://www.off-road.com/jeep/cheroke...tdcsensor.html
> Pictured:
> http://members.cox.net/wilsond/Fixes...tml#CPSdetails
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Steve Smith wrote:
>
>>My 95 Grand Cherokee would not start today. It is not getting any ignition.
>>The engine turns over fine but there is no spark from spark plug wires or
>>from the coil. I've tested the coil with a ohmmeter and it checked out fine.
>>I replaced the distributor cap and rotor button, but that didn't help. I
>>fear it might be the Powertrain Control Module(PCM). My Haynes repair manual
>>does not explain how to test this. Does anyone here know? Is there something
>>else I should check? I have a 4.0L V6 motor.
>>
>>Any suggestions would be greatly appreciated.
>>
>>BTW- If it is the Powertrain Control Module, is it possible to purchase an
>>after-market PCM that is better? I saw this on Ebay:
>>http://cgi.ebay.com/ebaymotors/ws/eB...category=33597
>>but I don't know if it a PCM replacement or just an add on.
>>
>>Steve Smith

Re: Need help in troubleshooting ignition problem
 

Steve should follow the advice given at the end of Bill's first URL
(below) -- find the 2-wire plug for the CPS driver's side near the
firewall, just behind the valve cover. Carefully unplug (don't break
the keeper off), securely replug. My `89 XJ would refuse to start about
once a year, curiously, usually just after an oil change. Unplug,
reconnect, start up and I'd be good to go another 15,000 miles or so
before it happened again. Never did have to replace the part.


L.W.(ßill) ------ III wrote:
> Hi Steve,
> Ninety nine and nine tens percent of the time it is the Crankshaft
> Position Sensor:
> http://www.off-road.com/jeep/cheroke...tdcsensor.html
> Pictured:
> http://members.cox.net/wilsond/Fixes...tml#CPSdetails
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Steve Smith wrote:
>
>>My 95 Grand Cherokee would not start today. It is not getting any ignition.
>>The engine turns over fine but there is no spark from spark plug wires or
>>from the coil. I've tested the coil with a ohmmeter and it checked out fine.
>>I replaced the distributor cap and rotor button, but that didn't help. I
>>fear it might be the Powertrain Control Module(PCM). My Haynes repair manual
>>does not explain how to test this. Does anyone here know? Is there something
>>else I should check? I have a 4.0L V6 motor.
>>
>>Any suggestions would be greatly appreciated.
>>
>>BTW- If it is the Powertrain Control Module, is it possible to purchase an
>>after-market PCM that is better? I saw this on Ebay:
>>http://cgi.ebay.com/ebaymotors/ws/eB...category=33597
>>but I don't know if it a PCM replacement or just an add on.
>>
>>Steve Smith

Re: Need help in troubleshooting ignition problem
 

They get bad connections easy, some spray contact cleaner in them and
dielectric grease on the seal helps. Just unplugging is still good, the
pin gets scratched enough to make a new contact usually.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Lee Ayrton wrote:
>
> Steve should follow the advice given at the end of Bill's first URL
> (below) -- find the 2-wire plug for the CPS driver's side near the
> firewall, just behind the valve cover. Carefully unplug (don't break
> the keeper off), securely replug. My `89 XJ would refuse to start about
> once a year, curiously, usually just after an oil change. Unplug,
> reconnect, start up and I'd be good to go another 15,000 miles or so
> before it happened again. Never did have to replace the part.
>
> L.W.(ßill) ------ III wrote:
> > Hi Steve,
> > Ninety nine and nine tens percent of the time it is the Crankshaft
> > Position Sensor:
> > http://www.off-road.com/jeep/cheroke...tdcsensor.html
> > Pictured:
> > http://members.cox.net/wilsond/Fixes...tml#CPSdetails
> > God Bless America, ßill O|||||||O
> > mailto:-------------------- http://www.----------.com/
> >
> > Steve Smith wrote:
> >
> >>My 95 Grand Cherokee would not start today. It is not getting any ignition.
> >>The engine turns over fine but there is no spark from spark plug wires or
> >>from the coil. I've tested the coil with a ohmmeter and it checked out fine.
> >>I replaced the distributor cap and rotor button, but that didn't help. I
> >>fear it might be the Powertrain Control Module(PCM). My Haynes repair manual
> >>does not explain how to test this. Does anyone here know? Is there something
> >>else I should check? I have a 4.0L V6 motor.
> >>
> >>Any suggestions would be greatly appreciated.
> >>
> >>BTW- If it is the Powertrain Control Module, is it possible to purchase an
> >>after-market PCM that is better? I saw this on Ebay:
> >>http://cgi.ebay.com/ebaymotors/ws/eB...category=33597
> >>but I don't know if it a PCM replacement or just an add on.
> >>
> >>Steve Smith

Re: Need help in troubleshooting ignition problem
 

They get bad connections easy, some spray contact cleaner in them and
dielectric grease on the seal helps. Just unplugging is still good, the
pin gets scratched enough to make a new contact usually.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Lee Ayrton wrote:
>
> Steve should follow the advice given at the end of Bill's first URL
> (below) -- find the 2-wire plug for the CPS driver's side near the
> firewall, just behind the valve cover. Carefully unplug (don't break
> the keeper off), securely replug. My `89 XJ would refuse to start about
> once a year, curiously, usually just after an oil change. Unplug,
> reconnect, start up and I'd be good to go another 15,000 miles or so
> before it happened again. Never did have to replace the part.
>
> L.W.(ßill) ------ III wrote:
> > Hi Steve,
> > Ninety nine and nine tens percent of the time it is the Crankshaft
> > Position Sensor:
> > http://www.off-road.com/jeep/cheroke...tdcsensor.html
> > Pictured:
> > http://members.cox.net/wilsond/Fixes...tml#CPSdetails
> > God Bless America, ßill O|||||||O
> > mailto:-------------------- http://www.----------.com/
> >
> > Steve Smith wrote:
> >
> >>My 95 Grand Cherokee would not start today. It is not getting any ignition.
> >>The engine turns over fine but there is no spark from spark plug wires or
> >>from the coil. I've tested the coil with a ohmmeter and it checked out fine.
> >>I replaced the distributor cap and rotor button, but that didn't help. I
> >>fear it might be the Powertrain Control Module(PCM). My Haynes repair manual
> >>does not explain how to test this. Does anyone here know? Is there something
> >>else I should check? I have a 4.0L V6 motor.
> >>
> >>Any suggestions would be greatly appreciated.
> >>
> >>BTW- If it is the Powertrain Control Module, is it possible to purchase an
> >>after-market PCM that is better? I saw this on Ebay:
> >>http://cgi.ebay.com/ebaymotors/ws/eB...category=33597
> >>but I don't know if it a PCM replacement or just an add on.
> >>
> >>Steve Smith

Re: Need help in troubleshooting ignition problem
 

They get bad connections easy, some spray contact cleaner in them and
dielectric grease on the seal helps. Just unplugging is still good, the
pin gets scratched enough to make a new contact usually.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Lee Ayrton wrote:
>
> Steve should follow the advice given at the end of Bill's first URL
> (below) -- find the 2-wire plug for the CPS driver's side near the
> firewall, just behind the valve cover. Carefully unplug (don't break
> the keeper off), securely replug. My `89 XJ would refuse to start about
> once a year, curiously, usually just after an oil change. Unplug,
> reconnect, start up and I'd be good to go another 15,000 miles or so
> before it happened again. Never did have to replace the part.
>
> L.W.(ßill) ------ III wrote:
> > Hi Steve,
> > Ninety nine and nine tens percent of the time it is the Crankshaft
> > Position Sensor:
> > http://www.off-road.com/jeep/cheroke...tdcsensor.html
> > Pictured:
> > http://members.cox.net/wilsond/Fixes...tml#CPSdetails
> > God Bless America, ßill O|||||||O
> > mailto:-------------------- http://www.----------.com/
> >
> > Steve Smith wrote:
> >
> >>My 95 Grand Cherokee would not start today. It is not getting any ignition.
> >>The engine turns over fine but there is no spark from spark plug wires or
> >>from the coil. I've tested the coil with a ohmmeter and it checked out fine.
> >>I replaced the distributor cap and rotor button, but that didn't help. I
> >>fear it might be the Powertrain Control Module(PCM). My Haynes repair manual
> >>does not explain how to test this. Does anyone here know? Is there something
> >>else I should check? I have a 4.0L V6 motor.
> >>
> >>Any suggestions would be greatly appreciated.
> >>
> >>BTW- If it is the Powertrain Control Module, is it possible to purchase an
> >>after-market PCM that is better? I saw this on Ebay:
> >>http://cgi.ebay.com/ebaymotors/ws/eB...category=33597
> >>but I don't know if it a PCM replacement or just an add on.
> >>
> >>Steve Smith

Re: Need help in troubleshooting ignition problem
 

Good catch Mike. I am reasonably sure that the V6 4.0 in the 95 ZJ
still has a CPS. Unfortunately the sensor itself is constructed of
pure "FailureToReadTheFineManualanium" and therefore quite expensive.
It is also somewhat difficult to locate, since the first problem
would be locating the other cylinder bank under the hood.

Mike Romain proclaimed:

> Bill, do V6's have that CPS? He says he has the V6.
>
> But other than a dead CPS, how is the body ground? If bad no spark. I
> test them by running a booster cable from the battery negative to the
> firewall. On the straight six, the ground is a wire mesh strap from the
> head to the firewall, don't know where it is on the V6 or V8.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> "L.W.(ßill) ------ III" wrote:
>
>>Hi Steve,
>> Ninety nine and nine tens percent of the time it is the Crankshaft
>>Position Sensor:
>>http://www.off-road.com/jeep/cheroke...tdcsensor.html
>>Pictured:
>>http://members.cox.net/wilsond/Fixes...tml#CPSdetails
>> God Bless America, ßill O|||||||O
>>mailto:-------------------- http://www.----------.com/
>>
>>Steve Smith wrote:
>>
>>>My 95 Grand Cherokee would not start today. It is not getting any ignition.
>>>The engine turns over fine but there is no spark from spark plug wires or
>>>from the coil. I've tested the coil with a ohmmeter and it checked out fine.
>>>I replaced the distributor cap and rotor button, but that didn't help. I
>>>fear it might be the Powertrain Control Module(PCM). My Haynes repair manual
>>>does not explain how to test this. Does anyone here know? Is there something
>>>else I should check? I have a 4.0L V6 motor.
>>>
>>>Any suggestions would be greatly appreciated.
>>>
>>>BTW- If it is the Powertrain Control Module, is it possible to purchase an
>>>after-market PCM that is better? I saw this on Ebay:
>>>http://cgi.ebay.com/ebaymotors/ws/eB...category=33597
>>>but I don't know if it a PCM replacement or just an add on.
>>>
>>>Steve Smith

Re: Need help in troubleshooting ignition problem
 

Good catch Mike. I am reasonably sure that the V6 4.0 in the 95 ZJ
still has a CPS. Unfortunately the sensor itself is constructed of
pure "FailureToReadTheFineManualanium" and therefore quite expensive.
It is also somewhat difficult to locate, since the first problem
would be locating the other cylinder bank under the hood.

Mike Romain proclaimed:

> Bill, do V6's have that CPS? He says he has the V6.
>
> But other than a dead CPS, how is the body ground? If bad no spark. I
> test them by running a booster cable from the battery negative to the
> firewall. On the straight six, the ground is a wire mesh strap from the
> head to the firewall, don't know where it is on the V6 or V8.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> "L.W.(ßill) ------ III" wrote:
>
>>Hi Steve,
>> Ninety nine and nine tens percent of the time it is the Crankshaft
>>Position Sensor:
>>http://www.off-road.com/jeep/cheroke...tdcsensor.html
>>Pictured:
>>http://members.cox.net/wilsond/Fixes...tml#CPSdetails
>> God Bless America, ßill O|||||||O
>>mailto:-------------------- http://www.----------.com/
>>
>>Steve Smith wrote:
>>
>>>My 95 Grand Cherokee would not start today. It is not getting any ignition.
>>>The engine turns over fine but there is no spark from spark plug wires or
>>>from the coil. I've tested the coil with a ohmmeter and it checked out fine.
>>>I replaced the distributor cap and rotor button, but that didn't help. I
>>>fear it might be the Powertrain Control Module(PCM). My Haynes repair manual
>>>does not explain how to test this. Does anyone here know? Is there something
>>>else I should check? I have a 4.0L V6 motor.
>>>
>>>Any suggestions would be greatly appreciated.
>>>
>>>BTW- If it is the Powertrain Control Module, is it possible to purchase an
>>>after-market PCM that is better? I saw this on Ebay:
>>>http://cgi.ebay.com/ebaymotors/ws/eB...category=33597
>>>but I don't know if it a PCM replacement or just an add on.
>>>
>>>Steve Smith

Re: Need help in troubleshooting ignition problem
 

Good catch Mike. I am reasonably sure that the V6 4.0 in the 95 ZJ
still has a CPS. Unfortunately the sensor itself is constructed of
pure "FailureToReadTheFineManualanium" and therefore quite expensive.
It is also somewhat difficult to locate, since the first problem
would be locating the other cylinder bank under the hood.

Mike Romain proclaimed:

> Bill, do V6's have that CPS? He says he has the V6.
>
> But other than a dead CPS, how is the body ground? If bad no spark. I
> test them by running a booster cable from the battery negative to the
> firewall. On the straight six, the ground is a wire mesh strap from the
> head to the firewall, don't know where it is on the V6 or V8.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> "L.W.(ßill) ------ III" wrote:
>
>>Hi Steve,
>> Ninety nine and nine tens percent of the time it is the Crankshaft
>>Position Sensor:
>>http://www.off-road.com/jeep/cheroke...tdcsensor.html
>>Pictured:
>>http://members.cox.net/wilsond/Fixes...tml#CPSdetails
>> God Bless America, ßill O|||||||O
>>mailto:-------------------- http://www.----------.com/
>>
>>Steve Smith wrote:
>>
>>>My 95 Grand Cherokee would not start today. It is not getting any ignition.
>>>The engine turns over fine but there is no spark from spark plug wires or
>>>from the coil. I've tested the coil with a ohmmeter and it checked out fine.
>>>I replaced the distributor cap and rotor button, but that didn't help. I
>>>fear it might be the Powertrain Control Module(PCM). My Haynes repair manual
>>>does not explain how to test this. Does anyone here know? Is there something
>>>else I should check? I have a 4.0L V6 motor.
>>>
>>>Any suggestions would be greatly appreciated.
>>>
>>>BTW- If it is the Powertrain Control Module, is it possible to purchase an
>>>after-market PCM that is better? I saw this on Ebay:
>>>http://cgi.ebay.com/ebaymotors/ws/eB...category=33597
>>>but I don't know if it a PCM replacement or just an add on.
>>>
>>>Steve Smith

Re: Need help in troubleshooting ignition problem
 

Merely unplugging it may bring it back to life, just like many times
we are forced to do that via instructions for hand held computers, my
phone machine, and my DirecTV satellite decoder.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Mike Romain wrote:
>
> They get bad connections easy, some spray contact cleaner in them and
> dielectric grease on the seal helps. Just unplugging is still good, the
> pin gets scratched enough to make a new contact usually.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's

Re: Need help in troubleshooting ignition problem
 

Merely unplugging it may bring it back to life, just like many times
we are forced to do that via instructions for hand held computers, my
phone machine, and my DirecTV satellite decoder.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Mike Romain wrote:
>
> They get bad connections easy, some spray contact cleaner in them and
> dielectric grease on the seal helps. Just unplugging is still good, the
> pin gets scratched enough to make a new contact usually.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's

Re: Need help in troubleshooting ignition problem
 

Merely unplugging it may bring it back to life, just like many times
we are forced to do that via instructions for hand held computers, my
phone machine, and my DirecTV satellite decoder.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Mike Romain wrote:
>
> They get bad connections easy, some spray contact cleaner in them and
> dielectric grease on the seal helps. Just unplugging is still good, the
> pin gets scratched enough to make a new contact usually.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's

Re: Need help in troubleshooting ignition problem
 

Thanks for the great help. It was the Crank Position Sensor. I purchased a
replacement from AutoZone for $55. After installing it, the car cranked
right up. The Crankshaft Position Sensor is not even mentioned in my Haynes
Jeep repair manual. I would not have been able to fix this if it was not for
the help in this group, especially L.W. ("ßill") ------ III . I can't thank
you enough.
Steve Smith

Re: Need help in troubleshooting ignition problem
 

Thanks for the great help. It was the Crank Position Sensor. I purchased a
replacement from AutoZone for $55. After installing it, the car cranked
right up. The Crankshaft Position Sensor is not even mentioned in my Haynes
Jeep repair manual. I would not have been able to fix this if it was not for
the help in this group, especially L.W. ("ßill") ------ III . I can't thank
you enough.
Steve Smith

Re: Need help in troubleshooting ignition problem
 

Thanks for the great help. It was the Crank Position Sensor. I purchased a
replacement from AutoZone for $55. After installing it, the car cranked
right up. The Crankshaft Position Sensor is not even mentioned in my Haynes
Jeep repair manual. I would not have been able to fix this if it was not for
the help in this group, especially L.W. ("ßill") ------ III . I can't thank
you enough.
Steve Smith

Re: Need help in troubleshooting ignition problem
 

Hi Steve,
Thanks for telling us what your problem was.
I merely referred you to the site:
http://www.off-road.com/jeep/cheroke...tdcsensor.html
as I do 99% of the time.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Steve Smith wrote:
>
> Thanks for the great help. It was the Crank Position Sensor. I purchased a
> replacement from AutoZone for $55. After installing it, the car cranked
> right up. The Crankshaft Position Sensor is not even mentioned in my Haynes
> Jeep repair manual. I would not have been able to fix this if it was not for
> the help in this group, especially L.W. ("ßill") ------ III . I can't thank
> you enough.
> Steve Smith

Re: Need help in troubleshooting ignition problem
 

Hi Steve,
Thanks for telling us what your problem was.
I merely referred you to the site:
http://www.off-road.com/jeep/cheroke...tdcsensor.html
as I do 99% of the time.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Steve Smith wrote:
>
> Thanks for the great help. It was the Crank Position Sensor. I purchased a
> replacement from AutoZone for $55. After installing it, the car cranked
> right up. The Crankshaft Position Sensor is not even mentioned in my Haynes
> Jeep repair manual. I would not have been able to fix this if it was not for
> the help in this group, especially L.W. ("ßill") ------ III . I can't thank
> you enough.
> Steve Smith

Re: Need help in troubleshooting ignition problem
 

Hi Steve,
Thanks for telling us what your problem was.
I merely referred you to the site:
http://www.off-road.com/jeep/cheroke...tdcsensor.html
as I do 99% of the time.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Steve Smith wrote:
>
> Thanks for the great help. It was the Crank Position Sensor. I purchased a
> replacement from AutoZone for $55. After installing it, the car cranked
> right up. The Crankshaft Position Sensor is not even mentioned in my Haynes
> Jeep repair manual. I would not have been able to fix this if it was not for
> the help in this group, especially L.W. ("ßill") ------ III . I can't thank
> you enough.
> Steve Smith

Re: Need help in troubleshooting ignition problem
 

I forgot to mention, I was incorrect to type "V6" in my original post. It's
a I6. I realized my error right after I posted, but I figured you guys would
know what I meant to type.
Steve Smith

Re: Need help in troubleshooting ignition problem
 

I forgot to mention, I was incorrect to type "V6" in my original post. It's
a I6. I realized my error right after I posted, but I figured you guys would
know what I meant to type.
Steve Smith

Re: Need help in troubleshooting ignition problem
 

I forgot to mention, I was incorrect to type "V6" in my original post. It's
a I6. I realized my error right after I posted, but I figured you guys would
know what I meant to type.
Steve Smith

Re: Need help in troubleshooting ignition problem
 

I'm still getting used to you Americans calling it an "Inline 6" instead of
a "Straight 6" :-)


Dave Milne, Scotland
'91 Grand Wagoneer, '99 TJ

"Steve Smith" <s.w.smithREMOVECAPS@ctliving.net> wrote in message
news:c2%3e.13753$%d7.8698@lakeread03...
> I forgot to mention, I was incorrect to type "V6" in my original post.
It's
> a I6. I realized my error right after I posted, but I figured you guys
would
> know what I meant to type.
> Steve Smith

Re: Need help in troubleshooting ignition problem
 

I'm still getting used to you Americans calling it an "Inline 6" instead of
a "Straight 6" :-)


Dave Milne, Scotland
'91 Grand Wagoneer, '99 TJ

"Steve Smith" <s.w.smithREMOVECAPS@ctliving.net> wrote in message
news:c2%3e.13753$%d7.8698@lakeread03...
> I forgot to mention, I was incorrect to type "V6" in my original post.
It's
> a I6. I realized my error right after I posted, but I figured you guys
would
> know what I meant to type.
> Steve Smith

Re: Need help in troubleshooting ignition problem
 

I'm still getting used to you Americans calling it an "Inline 6" instead of
a "Straight 6" :-)


Dave Milne, Scotland
'91 Grand Wagoneer, '99 TJ

"Steve Smith" <s.w.smithREMOVECAPS@ctliving.net> wrote in message
news:c2%3e.13753$%d7.8698@lakeread03...
> I forgot to mention, I was incorrect to type "V6" in my original post.
It's
> a I6. I realized my error right after I posted, but I figured you guys
would
> know what I meant to type.
> Steve Smith

Re: Need help in troubleshooting ignition problem
 

Dave Milne did pass the time by typing:
> I'm still getting used to you Americans calling it an "Inline 6" instead of
> a "Straight 6" :-)

Well, the designation on the ZJs paperwork is L6, linear 6 I suppose.



--
DougW

Re: Need help in troubleshooting ignition problem
 

Dave Milne did pass the time by typing:
> I'm still getting used to you Americans calling it an "Inline 6" instead of
> a "Straight 6" :-)

Well, the designation on the ZJs paperwork is L6, linear 6 I suppose.



--
DougW

Re: Need help in troubleshooting ignition problem
 

Dave Milne did pass the time by typing:
> I'm still getting used to you Americans calling it an "Inline 6" instead of
> a "Straight 6" :-)

Well, the designation on the ZJs paperwork is L6, linear 6 I suppose.



--
DougW