Re: 96 Grand Cherokee Stalling
 

DougW wrote:
>
> Have you replaced the ignition coil?
>
> --
> DougW

Yes. That was the first thing I tried last weekend. I replaced the
distributor cap just now, and still got it to stall out. This time I
had a fuel pressure gage with me. Right after it stalled, I hooked up
the gage, but saw zero pressure. Then I turned off the ignition and
back on, and got a full 49 psi. It started back up, ran less than a
minute and cut off again. This time the fuel pressure gage was still
reading 49 psi. I started it again, and it ran very rough for about a
minute, but the fuel pressure was rock steady at 49 psi.

If not for that initial reading of zero, I'd be confident that it was
not the fuel pump. Naturally, I haven't been able to get it to stall
again while sitting in the yard. I'm really getting tired of having to
do this out in traffic.

Doug B.

Re: 96 Grand Cherokee Stalling
 

DougW wrote:
>
> Have you replaced the ignition coil?
>
> --
> DougW

Yes. That was the first thing I tried last weekend. I replaced the
distributor cap just now, and still got it to stall out. This time I
had a fuel pressure gage with me. Right after it stalled, I hooked up
the gage, but saw zero pressure. Then I turned off the ignition and
back on, and got a full 49 psi. It started back up, ran less than a
minute and cut off again. This time the fuel pressure gage was still
reading 49 psi. I started it again, and it ran very rough for about a
minute, but the fuel pressure was rock steady at 49 psi.

If not for that initial reading of zero, I'd be confident that it was
not the fuel pump. Naturally, I haven't been able to get it to stall
again while sitting in the yard. I'm really getting tired of having to
do this out in traffic.

Doug B.

Re: 96 Grand Cherokee Stalling
 

DougW wrote:
>
> Have you replaced the ignition coil?
>
> --
> DougW

Yes. That was the first thing I tried last weekend. I replaced the
distributor cap just now, and still got it to stall out. This time I
had a fuel pressure gage with me. Right after it stalled, I hooked up
the gage, but saw zero pressure. Then I turned off the ignition and
back on, and got a full 49 psi. It started back up, ran less than a
minute and cut off again. This time the fuel pressure gage was still
reading 49 psi. I started it again, and it ran very rough for about a
minute, but the fuel pressure was rock steady at 49 psi.

If not for that initial reading of zero, I'd be confident that it was
not the fuel pump. Naturally, I haven't been able to get it to stall
again while sitting in the yard. I'm really getting tired of having to
do this out in traffic.

Doug B.

Re: 96 Grand Cherokee Stalling
 

Outatime wrote:
> It doesn't sound like fuel delivery is the problem, especially if it
> will not restart immediately. Translate a code 43 for me: it doesn't
> sound like the OBD that I am accustomed to.
>
> Regardless of what code it is throwing, basic ignition continuity should
> be checked. Intermittant problems are difficult to diagnose and are
> labor intensive. Wiggle testing might be your next assignment.

According the engine code chart on Doug Wilson's excellent web page, a
code 43 can be either of the following:

43 Peak primary circuit current not achieved with maximum dwell time.
43 Misfire detected in one or more cylinders 1 thru 6. (4 and 6 cyls.)


What in particular should I try wiggling?

Thanks,
Doug B.

Re: 96 Grand Cherokee Stalling
 

Outatime wrote:
> It doesn't sound like fuel delivery is the problem, especially if it
> will not restart immediately. Translate a code 43 for me: it doesn't
> sound like the OBD that I am accustomed to.
>
> Regardless of what code it is throwing, basic ignition continuity should
> be checked. Intermittant problems are difficult to diagnose and are
> labor intensive. Wiggle testing might be your next assignment.

According the engine code chart on Doug Wilson's excellent web page, a
code 43 can be either of the following:

43 Peak primary circuit current not achieved with maximum dwell time.
43 Misfire detected in one or more cylinders 1 thru 6. (4 and 6 cyls.)


What in particular should I try wiggling?

Thanks,
Doug B.

Re: 96 Grand Cherokee Stalling
 

Outatime wrote:
> It doesn't sound like fuel delivery is the problem, especially if it
> will not restart immediately. Translate a code 43 for me: it doesn't
> sound like the OBD that I am accustomed to.
>
> Regardless of what code it is throwing, basic ignition continuity should
> be checked. Intermittant problems are difficult to diagnose and are
> labor intensive. Wiggle testing might be your next assignment.

According the engine code chart on Doug Wilson's excellent web page, a
code 43 can be either of the following:

43 Peak primary circuit current not achieved with maximum dwell time.
43 Misfire detected in one or more cylinders 1 thru 6. (4 and 6 cyls.)


What in particular should I try wiggling?

Thanks,
Doug B.

Re: 96 Grand Cherokee Stalling
 

How long will it hold fuel pressure?

Leaking fuel injectors will make restart difficult....... do you get an
initial puff of black smoke when it does start?


<dougguitar@yahoo.com> wrote in message
news:1164576776.170319.260250@45g2000cws.googlegro ups.com...
>
> DougW wrote:
>>
>> Have you replaced the ignition coil?
>>
>> --
>> DougW
>
> Yes. That was the first thing I tried last weekend. I replaced the
> distributor cap just now, and still got it to stall out. This time I
> had a fuel pressure gage with me. Right after it stalled, I hooked up
> the gage, but saw zero pressure. Then I turned off the ignition and
> back on, and got a full 49 psi. It started back up, ran less than a
> minute and cut off again. This time the fuel pressure gage was still
> reading 49 psi. I started it again, and it ran very rough for about a
> minute, but the fuel pressure was rock steady at 49 psi.
>
> If not for that initial reading of zero, I'd be confident that it was
> not the fuel pump. Naturally, I haven't been able to get it to stall
> again while sitting in the yard. I'm really getting tired of having to
> do this out in traffic.
>
> Doug B.
>

Re: 96 Grand Cherokee Stalling
 

How long will it hold fuel pressure?

Leaking fuel injectors will make restart difficult....... do you get an
initial puff of black smoke when it does start?


<dougguitar@yahoo.com> wrote in message
news:1164576776.170319.260250@45g2000cws.googlegro ups.com...
>
> DougW wrote:
>>
>> Have you replaced the ignition coil?
>>
>> --
>> DougW
>
> Yes. That was the first thing I tried last weekend. I replaced the
> distributor cap just now, and still got it to stall out. This time I
> had a fuel pressure gage with me. Right after it stalled, I hooked up
> the gage, but saw zero pressure. Then I turned off the ignition and
> back on, and got a full 49 psi. It started back up, ran less than a
> minute and cut off again. This time the fuel pressure gage was still
> reading 49 psi. I started it again, and it ran very rough for about a
> minute, but the fuel pressure was rock steady at 49 psi.
>
> If not for that initial reading of zero, I'd be confident that it was
> not the fuel pump. Naturally, I haven't been able to get it to stall
> again while sitting in the yard. I'm really getting tired of having to
> do this out in traffic.
>
> Doug B.
>

Re: 96 Grand Cherokee Stalling
 

How long will it hold fuel pressure?

Leaking fuel injectors will make restart difficult....... do you get an
initial puff of black smoke when it does start?


<dougguitar@yahoo.com> wrote in message
news:1164576776.170319.260250@45g2000cws.googlegro ups.com...
>
> DougW wrote:
>>
>> Have you replaced the ignition coil?
>>
>> --
>> DougW
>
> Yes. That was the first thing I tried last weekend. I replaced the
> distributor cap just now, and still got it to stall out. This time I
> had a fuel pressure gage with me. Right after it stalled, I hooked up
> the gage, but saw zero pressure. Then I turned off the ignition and
> back on, and got a full 49 psi. It started back up, ran less than a
> minute and cut off again. This time the fuel pressure gage was still
> reading 49 psi. I started it again, and it ran very rough for about a
> minute, but the fuel pressure was rock steady at 49 psi.
>
> If not for that initial reading of zero, I'd be confident that it was
> not the fuel pump. Naturally, I haven't been able to get it to stall
> again while sitting in the yard. I'm really getting tired of having to
> do this out in traffic.
>
> Doug B.
>

Re: 96 Grand Cherokee Stalling
 

billy ray wrote:
> How long will it hold fuel pressure?
>
> Leaking fuel injectors will make restart difficult....... do you get an
> initial puff of black smoke when it does start?
>

No, no black smoke on a restart. I haven't timed it, but it holds fuel
pressure pretty well. At least 15 or 20 minutes.

Doug B.

Re: 96 Grand Cherokee Stalling
 

billy ray wrote:
> How long will it hold fuel pressure?
>
> Leaking fuel injectors will make restart difficult....... do you get an
> initial puff of black smoke when it does start?
>

No, no black smoke on a restart. I haven't timed it, but it holds fuel
pressure pretty well. At least 15 or 20 minutes.

Doug B.

Re: 96 Grand Cherokee Stalling
 

billy ray wrote:
> How long will it hold fuel pressure?
>
> Leaking fuel injectors will make restart difficult....... do you get an
> initial puff of black smoke when it does start?
>

No, no black smoke on a restart. I haven't timed it, but it holds fuel
pressure pretty well. At least 15 or 20 minutes.

Doug B.

Re: 96 Grand Cherokee Stalling
 

dougguitar wrote:
> DougW wrote:
>>
>> Have you replaced the ignition coil?

> Yes. That was the first thing I tried last weekend. I replaced the
> distributor cap just now, and still got it to stall out. This time I
> had a fuel pressure gage with me. Right after it stalled, I hooked up
> the gage, but saw zero pressure. Then I turned off the ignition and
> back on, and got a full 49 psi. It started back up, ran less than a
> minute and cut off again. This time the fuel pressure gage was still
> reading 49 psi. I started it again, and it ran very rough for about a
> minute, but the fuel pressure was rock steady at 49 psi.

Your fuel pressure is good, possibly even a bit on the high side. How's the hose look that connects the intake rail to the pressure
regulator at the front of the fuel rail? Measure the pressure then take that hose off and see if it goes up.
It should go up a few psi.

--
DougW

Re: 96 Grand Cherokee Stalling
 

dougguitar wrote:
> DougW wrote:
>>
>> Have you replaced the ignition coil?

> Yes. That was the first thing I tried last weekend. I replaced the
> distributor cap just now, and still got it to stall out. This time I
> had a fuel pressure gage with me. Right after it stalled, I hooked up
> the gage, but saw zero pressure. Then I turned off the ignition and
> back on, and got a full 49 psi. It started back up, ran less than a
> minute and cut off again. This time the fuel pressure gage was still
> reading 49 psi. I started it again, and it ran very rough for about a
> minute, but the fuel pressure was rock steady at 49 psi.

Your fuel pressure is good, possibly even a bit on the high side. How's the hose look that connects the intake rail to the pressure
regulator at the front of the fuel rail? Measure the pressure then take that hose off and see if it goes up.
It should go up a few psi.

--
DougW

Re: 96 Grand Cherokee Stalling
 

dougguitar wrote:
> DougW wrote:
>>
>> Have you replaced the ignition coil?

> Yes. That was the first thing I tried last weekend. I replaced the
> distributor cap just now, and still got it to stall out. This time I
> had a fuel pressure gage with me. Right after it stalled, I hooked up
> the gage, but saw zero pressure. Then I turned off the ignition and
> back on, and got a full 49 psi. It started back up, ran less than a
> minute and cut off again. This time the fuel pressure gage was still
> reading 49 psi. I started it again, and it ran very rough for about a
> minute, but the fuel pressure was rock steady at 49 psi.

Your fuel pressure is good, possibly even a bit on the high side. How's the hose look that connects the intake rail to the pressure
regulator at the front of the fuel rail? Measure the pressure then take that hose off and see if it goes up.
It should go up a few psi.

--
DougW

Re: 96 Grand Cherokee Stalling
 

dougguitar@yahoo.com wrote:
> Outatime wrote:
>> It doesn't sound like fuel delivery is the problem, especially if it
>> will not restart immediately. Translate a code 43 for me: it doesn't
>> sound like the OBD that I am accustomed to.

96 is OBDII

>> Regardless of what code it is throwing, basic ignition continuity
>> should be checked. Intermittant problems are difficult to diagnose
>> and are labor intensive. Wiggle testing might be your next
>> assignment.
>
> According the engine code chart on Doug Wilson's excellent web page, a
> code 43 can be either of the following:
>
> 43 Peak primary circuit current not achieved with maximum dwell time.
(it's going to be this one)

This is telling me the coil circuit is having problems. It could be the connector, the engine ground, or the coil. The only other
thing it can be is the computer. That's not likely. What coil did you use?

When I was having problems in my 93 I found out the napa part with harness was needed. This was the same coil Jeep installed to
solve an earlier idle problem. The harness has an internal resistor.

The coil gets 12v from the ASD relay, make sure it's pins are clean. Actually you might swap that relay with the AC or Fog relay
just to make sure.



--
DougW

Re: 96 Grand Cherokee Stalling
 

dougguitar@yahoo.com wrote:
> Outatime wrote:
>> It doesn't sound like fuel delivery is the problem, especially if it
>> will not restart immediately. Translate a code 43 for me: it doesn't
>> sound like the OBD that I am accustomed to.

96 is OBDII

>> Regardless of what code it is throwing, basic ignition continuity
>> should be checked. Intermittant problems are difficult to diagnose
>> and are labor intensive. Wiggle testing might be your next
>> assignment.
>
> According the engine code chart on Doug Wilson's excellent web page, a
> code 43 can be either of the following:
>
> 43 Peak primary circuit current not achieved with maximum dwell time.
(it's going to be this one)

This is telling me the coil circuit is having problems. It could be the connector, the engine ground, or the coil. The only other
thing it can be is the computer. That's not likely. What coil did you use?

When I was having problems in my 93 I found out the napa part with harness was needed. This was the same coil Jeep installed to
solve an earlier idle problem. The harness has an internal resistor.

The coil gets 12v from the ASD relay, make sure it's pins are clean. Actually you might swap that relay with the AC or Fog relay
just to make sure.



--
DougW

Re: 96 Grand Cherokee Stalling
 

dougguitar@yahoo.com wrote:
> Outatime wrote:
>> It doesn't sound like fuel delivery is the problem, especially if it
>> will not restart immediately. Translate a code 43 for me: it doesn't
>> sound like the OBD that I am accustomed to.

96 is OBDII

>> Regardless of what code it is throwing, basic ignition continuity
>> should be checked. Intermittant problems are difficult to diagnose
>> and are labor intensive. Wiggle testing might be your next
>> assignment.
>
> According the engine code chart on Doug Wilson's excellent web page, a
> code 43 can be either of the following:
>
> 43 Peak primary circuit current not achieved with maximum dwell time.
(it's going to be this one)

This is telling me the coil circuit is having problems. It could be the connector, the engine ground, or the coil. The only other
thing it can be is the computer. That's not likely. What coil did you use?

When I was having problems in my 93 I found out the napa part with harness was needed. This was the same coil Jeep installed to
solve an earlier idle problem. The harness has an internal resistor.

The coil gets 12v from the ASD relay, make sure it's pins are clean. Actually you might swap that relay with the AC or Fog relay
just to make sure.



--
DougW

Re: 96 Grand Cherokee Stalling
 

dougguitar wrote:
> billy ray wrote:
>> How long will it hold fuel pressure?
>>
>> Leaking fuel injectors will make restart difficult....... do you get
>> an initial puff of black smoke when it does start?
>>
>
> No, no black smoke on a restart. I haven't timed it, but it holds fuel
> pressure pretty well. At least 15 or 20 minutes.

It should hold pressure for over 4-5 hours. Given this and your 45psi for fuel pressure I'm starting to think the regulator might
be shot. When you take the vac line off see if there is gas dribbling out.

--
DougW

Re: 96 Grand Cherokee Stalling
 

dougguitar wrote:
> billy ray wrote:
>> How long will it hold fuel pressure?
>>
>> Leaking fuel injectors will make restart difficult....... do you get
>> an initial puff of black smoke when it does start?
>>
>
> No, no black smoke on a restart. I haven't timed it, but it holds fuel
> pressure pretty well. At least 15 or 20 minutes.

It should hold pressure for over 4-5 hours. Given this and your 45psi for fuel pressure I'm starting to think the regulator might
be shot. When you take the vac line off see if there is gas dribbling out.

--
DougW

Re: 96 Grand Cherokee Stalling
 

dougguitar wrote:
> billy ray wrote:
>> How long will it hold fuel pressure?
>>
>> Leaking fuel injectors will make restart difficult....... do you get
>> an initial puff of black smoke when it does start?
>>
>
> No, no black smoke on a restart. I haven't timed it, but it holds fuel
> pressure pretty well. At least 15 or 20 minutes.

It should hold pressure for over 4-5 hours. Given this and your 45psi for fuel pressure I'm starting to think the regulator might
be shot. When you take the vac line off see if there is gas dribbling out.

--
DougW

Re: 96 Grand Cherokee Stalling
 

DougW wrote:
> It should hold pressure for over 4-5 hours. Given this and your 45psi for fuel pressure I'm starting to think the regulator might
> be shot. When you take the vac line off see if there is gas dribbling out.
>
> --
> DougW

OK, I timed it. After 4 minutes, the pressure had dropped from around
49 psi to about 35 psi. After 12 minutes, it had dropped to 20 psi. To
add to my fun, the 96 GC does not have the fuel pressure regulator
attached to the fuel rail: it's built into the fuel pump. @#$% There's
just a direct connect fuel line going to the fuel rail.

Will a regulator fail in this intermittent way? If that's the case,
then I have to pony up the $300 plus for a new fuel pump. Sure wish I
could be sure before I make the financial plunge.

By the way, the coil I used was regular old AutoZone Duralast.

Doug B.

Re: 96 Grand Cherokee Stalling
 

DougW wrote:
> It should hold pressure for over 4-5 hours. Given this and your 45psi for fuel pressure I'm starting to think the regulator might
> be shot. When you take the vac line off see if there is gas dribbling out.
>
> --
> DougW

OK, I timed it. After 4 minutes, the pressure had dropped from around
49 psi to about 35 psi. After 12 minutes, it had dropped to 20 psi. To
add to my fun, the 96 GC does not have the fuel pressure regulator
attached to the fuel rail: it's built into the fuel pump. @#$% There's
just a direct connect fuel line going to the fuel rail.

Will a regulator fail in this intermittent way? If that's the case,
then I have to pony up the $300 plus for a new fuel pump. Sure wish I
could be sure before I make the financial plunge.

By the way, the coil I used was regular old AutoZone Duralast.

Doug B.

Re: 96 Grand Cherokee Stalling
 

DougW wrote:
> It should hold pressure for over 4-5 hours. Given this and your 45psi for fuel pressure I'm starting to think the regulator might
> be shot. When you take the vac line off see if there is gas dribbling out.
>
> --
> DougW

OK, I timed it. After 4 minutes, the pressure had dropped from around
49 psi to about 35 psi. After 12 minutes, it had dropped to 20 psi. To
add to my fun, the 96 GC does not have the fuel pressure regulator
attached to the fuel rail: it's built into the fuel pump. @#$% There's
just a direct connect fuel line going to the fuel rail.

Will a regulator fail in this intermittent way? If that's the case,
then I have to pony up the $300 plus for a new fuel pump. Sure wish I
could be sure before I make the financial plunge.

By the way, the coil I used was regular old AutoZone Duralast.

Doug B.

Re: 96 Grand Cherokee Stalling
 

did u replace the cap and rotor too?

dougguitar@yahoo.com wrote:

> The saga continues...
>
> I've changed the spark plugs and wires, and added some fuel injector
> cleaner. I've checked the fuel pressure at the rail; it's got plenty of
> fuel pressure. Nevertheless, sometimes it will just up and stall out on
> me. It can be at idle, or at 35 mph. I can even get a quick buck or
> hesitation at 50 mph or higher. If I really give it a ton of gas, I
> might keep it running, but when I do that it usually sputters, coughs
> and chokes, acting like it's running on one or two cylinders. When it
> stalls, it rarely wants to start right back up. I have to keep trying
> and praying for several minutes. After the last episode, it set five
> separate code 43's. Yes, five of them.
>
> I also put in a brand new crankshaft position sensor. Obviously, that
> didn't do the trick, even though the old one showed considerably less
> than infinite resistance across terminals B and C (suggesting it was
> bad).
>
> I guess I'll pull the distributor cap and take a look at the rotor.
> Grrr....
>
> Doug

Re: 96 Grand Cherokee Stalling
 

did u replace the cap and rotor too?

dougguitar@yahoo.com wrote:

> The saga continues...
>
> I've changed the spark plugs and wires, and added some fuel injector
> cleaner. I've checked the fuel pressure at the rail; it's got plenty of
> fuel pressure. Nevertheless, sometimes it will just up and stall out on
> me. It can be at idle, or at 35 mph. I can even get a quick buck or
> hesitation at 50 mph or higher. If I really give it a ton of gas, I
> might keep it running, but when I do that it usually sputters, coughs
> and chokes, acting like it's running on one or two cylinders. When it
> stalls, it rarely wants to start right back up. I have to keep trying
> and praying for several minutes. After the last episode, it set five
> separate code 43's. Yes, five of them.
>
> I also put in a brand new crankshaft position sensor. Obviously, that
> didn't do the trick, even though the old one showed considerably less
> than infinite resistance across terminals B and C (suggesting it was
> bad).
>
> I guess I'll pull the distributor cap and take a look at the rotor.
> Grrr....
>
> Doug

Re: 96 Grand Cherokee Stalling
 

did u replace the cap and rotor too?

dougguitar@yahoo.com wrote:

> The saga continues...
>
> I've changed the spark plugs and wires, and added some fuel injector
> cleaner. I've checked the fuel pressure at the rail; it's got plenty of
> fuel pressure. Nevertheless, sometimes it will just up and stall out on
> me. It can be at idle, or at 35 mph. I can even get a quick buck or
> hesitation at 50 mph or higher. If I really give it a ton of gas, I
> might keep it running, but when I do that it usually sputters, coughs
> and chokes, acting like it's running on one or two cylinders. When it
> stalls, it rarely wants to start right back up. I have to keep trying
> and praying for several minutes. After the last episode, it set five
> separate code 43's. Yes, five of them.
>
> I also put in a brand new crankshaft position sensor. Obviously, that
> didn't do the trick, even though the old one showed considerably less
> than infinite resistance across terminals B and C (suggesting it was
> bad).
>
> I guess I'll pull the distributor cap and take a look at the rotor.
> Grrr....
>
> Doug

Re: 96 Grand Cherokee Stalling
 

while it's running spray water on the coil and wires and watch for sparkage
archage

billy ray wrote:

> How long will it hold fuel pressure?
>
> Leaking fuel injectors will make restart difficult....... do you get an
> initial puff of black smoke when it does start?
>
> <dougguitar@yahoo.com> wrote in message
> news:1164576776.170319.260250@45g2000cws.googlegro ups.com...
> >
> > DougW wrote:
> >>
> >> Have you replaced the ignition coil?
> >>
> >> --
> >> DougW
> >
> > Yes. That was the first thing I tried last weekend. I replaced the
> > distributor cap just now, and still got it to stall out. This time I
> > had a fuel pressure gage with me. Right after it stalled, I hooked up
> > the gage, but saw zero pressure. Then I turned off the ignition and
> > back on, and got a full 49 psi. It started back up, ran less than a
> > minute and cut off again. This time the fuel pressure gage was still
> > reading 49 psi. I started it again, and it ran very rough for about a
> > minute, but the fuel pressure was rock steady at 49 psi.
> >
> > If not for that initial reading of zero, I'd be confident that it was
> > not the fuel pump. Naturally, I haven't been able to get it to stall
> > again while sitting in the yard. I'm really getting tired of having to
> > do this out in traffic.
> >
> > Doug B.
> >

Re: 96 Grand Cherokee Stalling
 

while it's running spray water on the coil and wires and watch for sparkage
archage

billy ray wrote:

> How long will it hold fuel pressure?
>
> Leaking fuel injectors will make restart difficult....... do you get an
> initial puff of black smoke when it does start?
>
> <dougguitar@yahoo.com> wrote in message
> news:1164576776.170319.260250@45g2000cws.googlegro ups.com...
> >
> > DougW wrote:
> >>
> >> Have you replaced the ignition coil?
> >>
> >> --
> >> DougW
> >
> > Yes. That was the first thing I tried last weekend. I replaced the
> > distributor cap just now, and still got it to stall out. This time I
> > had a fuel pressure gage with me. Right after it stalled, I hooked up
> > the gage, but saw zero pressure. Then I turned off the ignition and
> > back on, and got a full 49 psi. It started back up, ran less than a
> > minute and cut off again. This time the fuel pressure gage was still
> > reading 49 psi. I started it again, and it ran very rough for about a
> > minute, but the fuel pressure was rock steady at 49 psi.
> >
> > If not for that initial reading of zero, I'd be confident that it was
> > not the fuel pump. Naturally, I haven't been able to get it to stall
> > again while sitting in the yard. I'm really getting tired of having to
> > do this out in traffic.
> >
> > Doug B.
> >

Re: 96 Grand Cherokee Stalling
 

while it's running spray water on the coil and wires and watch for sparkage
archage

billy ray wrote:

> How long will it hold fuel pressure?
>
> Leaking fuel injectors will make restart difficult....... do you get an
> initial puff of black smoke when it does start?
>
> <dougguitar@yahoo.com> wrote in message
> news:1164576776.170319.260250@45g2000cws.googlegro ups.com...
> >
> > DougW wrote:
> >>
> >> Have you replaced the ignition coil?
> >>
> >> --
> >> DougW
> >
> > Yes. That was the first thing I tried last weekend. I replaced the
> > distributor cap just now, and still got it to stall out. This time I
> > had a fuel pressure gage with me. Right after it stalled, I hooked up
> > the gage, but saw zero pressure. Then I turned off the ignition and
> > back on, and got a full 49 psi. It started back up, ran less than a
> > minute and cut off again. This time the fuel pressure gage was still
> > reading 49 psi. I started it again, and it ran very rough for about a
> > minute, but the fuel pressure was rock steady at 49 psi.
> >
> > If not for that initial reading of zero, I'd be confident that it was
> > not the fuel pump. Naturally, I haven't been able to get it to stall
> > again while sitting in the yard. I'm really getting tired of having to
> > do this out in traffic.
> >
> > Doug B.
> >

Re: 96 Grand Cherokee Stalling
 

it should hold no less that 10 psi over nite if it goes to big fat 0 there is a problem

DougW wrote:

> dougguitar wrote:
> > billy ray wrote:
> >> How long will it hold fuel pressure?
> >>
> >> Leaking fuel injectors will make restart difficult....... do you get
> >> an initial puff of black smoke when it does start?
> >>
> >
> > No, no black smoke on a restart. I haven't timed it, but it holds fuel
> > pressure pretty well. At least 15 or 20 minutes.
>
> It should hold pressure for over 4-5 hours. Given this and your 45psi for fuel pressure I'm starting to think the regulator might
> be shot. When you take the vac line off see if there is gas dribbling out.
>
> --
> DougW

Re: 96 Grand Cherokee Stalling
 

it should hold no less that 10 psi over nite if it goes to big fat 0 there is a problem

DougW wrote:

> dougguitar wrote:
> > billy ray wrote:
> >> How long will it hold fuel pressure?
> >>
> >> Leaking fuel injectors will make restart difficult....... do you get
> >> an initial puff of black smoke when it does start?
> >>
> >
> > No, no black smoke on a restart. I haven't timed it, but it holds fuel
> > pressure pretty well. At least 15 or 20 minutes.
>
> It should hold pressure for over 4-5 hours. Given this and your 45psi for fuel pressure I'm starting to think the regulator might
> be shot. When you take the vac line off see if there is gas dribbling out.
>
> --
> DougW

Re: 96 Grand Cherokee Stalling
 

it should hold no less that 10 psi over nite if it goes to big fat 0 there is a problem

DougW wrote:

> dougguitar wrote:
> > billy ray wrote:
> >> How long will it hold fuel pressure?
> >>
> >> Leaking fuel injectors will make restart difficult....... do you get
> >> an initial puff of black smoke when it does start?
> >>
> >
> > No, no black smoke on a restart. I haven't timed it, but it holds fuel
> > pressure pretty well. At least 15 or 20 minutes.
>
> It should hold pressure for over 4-5 hours. Given this and your 45psi for fuel pressure I'm starting to think the regulator might
> be shot. When you take the vac line off see if there is gas dribbling out.
>
> --
> DougW

Re: 96 Grand Cherokee Stalling
 

dougguitar@yahoo.com wrote:
> DougW wrote:
>> It should hold pressure for over 4-5 hours. Given this and your
>> 45psi for fuel pressure I'm starting to think the regulator might be
>> shot. When you take the vac line off see if there is gas dribbling
>> out.
>>
>> --
>> DougW
>
> OK, I timed it. After 4 minutes, the pressure had dropped from around
> 49 psi to about 35 psi. After 12 minutes, it had dropped to 20 psi. To
> add to my fun, the 96 GC does not have the fuel pressure regulator
> attached to the fuel rail: it's built into the fuel pump. @#$%
> There's just a direct connect fuel line going to the fuel rail.
>
> Will a regulator fail in this intermittent way? If that's the case,
> then I have to pony up the $300 plus for a new fuel pump. Sure wish I
> could be sure before I make the financial plunge.

Hard to tell, the 96 made a lot of changes and my books are only good
up to the 95. 49 psi might be normal. Still though I thought pressure
was supposed to be maintained longer than that. I'd suggest calling a
dealership and asking if a mechanic could look that up for you. It's
worth a shot.

I don't think it is your fuel pump. Pumps and pressure regulators
usually fail to the low pressure side and what you get is a lack of
power at wide-open-trottle or even pinging.

--
DougW

Re: 96 Grand Cherokee Stalling
 

dougguitar@yahoo.com wrote:
> DougW wrote:
>> It should hold pressure for over 4-5 hours. Given this and your
>> 45psi for fuel pressure I'm starting to think the regulator might be
>> shot. When you take the vac line off see if there is gas dribbling
>> out.
>>
>> --
>> DougW
>
> OK, I timed it. After 4 minutes, the pressure had dropped from around
> 49 psi to about 35 psi. After 12 minutes, it had dropped to 20 psi. To
> add to my fun, the 96 GC does not have the fuel pressure regulator
> attached to the fuel rail: it's built into the fuel pump. @#$%
> There's just a direct connect fuel line going to the fuel rail.
>
> Will a regulator fail in this intermittent way? If that's the case,
> then I have to pony up the $300 plus for a new fuel pump. Sure wish I
> could be sure before I make the financial plunge.

Hard to tell, the 96 made a lot of changes and my books are only good
up to the 95. 49 psi might be normal. Still though I thought pressure
was supposed to be maintained longer than that. I'd suggest calling a
dealership and asking if a mechanic could look that up for you. It's
worth a shot.

I don't think it is your fuel pump. Pumps and pressure regulators
usually fail to the low pressure side and what you get is a lack of
power at wide-open-trottle or even pinging.

--
DougW

Re: 96 Grand Cherokee Stalling
 

dougguitar@yahoo.com wrote:
> DougW wrote:
>> It should hold pressure for over 4-5 hours. Given this and your
>> 45psi for fuel pressure I'm starting to think the regulator might be
>> shot. When you take the vac line off see if there is gas dribbling
>> out.
>>
>> --
>> DougW
>
> OK, I timed it. After 4 minutes, the pressure had dropped from around
> 49 psi to about 35 psi. After 12 minutes, it had dropped to 20 psi. To
> add to my fun, the 96 GC does not have the fuel pressure regulator
> attached to the fuel rail: it's built into the fuel pump. @#$%
> There's just a direct connect fuel line going to the fuel rail.
>
> Will a regulator fail in this intermittent way? If that's the case,
> then I have to pony up the $300 plus for a new fuel pump. Sure wish I
> could be sure before I make the financial plunge.

Hard to tell, the 96 made a lot of changes and my books are only good
up to the 95. 49 psi might be normal. Still though I thought pressure
was supposed to be maintained longer than that. I'd suggest calling a
dealership and asking if a mechanic could look that up for you. It's
worth a shot.

I don't think it is your fuel pump. Pumps and pressure regulators
usually fail to the low pressure side and what you get is a lack of
power at wide-open-trottle or even pinging.

--
DougW

Re: 96 Grand Cherokee Stalling
 

You have a second regulator on the engine for the return line I think.

How good is the body to engine or frame to engine or battery to the body
ground strap? One of those with a bad connection can cause your
symptoms.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

dougguitar@yahoo.com wrote:
>
> DougW wrote:
> > It should hold pressure for over 4-5 hours. Given this and your 45psi for fuel pressure I'm starting to think the regulator might
> > be shot. When you take the vac line off see if there is gas dribbling out.
> >
> > --
> > DougW
>
> OK, I timed it. After 4 minutes, the pressure had dropped from around
> 49 psi to about 35 psi. After 12 minutes, it had dropped to 20 psi. To
> add to my fun, the 96 GC does not have the fuel pressure regulator
> attached to the fuel rail: it's built into the fuel pump. @#$% There's
> just a direct connect fuel line going to the fuel rail.
>
> Will a regulator fail in this intermittent way? If that's the case,
> then I have to pony up the $300 plus for a new fuel pump. Sure wish I
> could be sure before I make the financial plunge.
>
> By the way, the coil I used was regular old AutoZone Duralast.
>
> Doug B.

Re: 96 Grand Cherokee Stalling
 

You have a second regulator on the engine for the return line I think.

How good is the body to engine or frame to engine or battery to the body
ground strap? One of those with a bad connection can cause your
symptoms.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

dougguitar@yahoo.com wrote:
>
> DougW wrote:
> > It should hold pressure for over 4-5 hours. Given this and your 45psi for fuel pressure I'm starting to think the regulator might
> > be shot. When you take the vac line off see if there is gas dribbling out.
> >
> > --
> > DougW
>
> OK, I timed it. After 4 minutes, the pressure had dropped from around
> 49 psi to about 35 psi. After 12 minutes, it had dropped to 20 psi. To
> add to my fun, the 96 GC does not have the fuel pressure regulator
> attached to the fuel rail: it's built into the fuel pump. @#$% There's
> just a direct connect fuel line going to the fuel rail.
>
> Will a regulator fail in this intermittent way? If that's the case,
> then I have to pony up the $300 plus for a new fuel pump. Sure wish I
> could be sure before I make the financial plunge.
>
> By the way, the coil I used was regular old AutoZone Duralast.
>
> Doug B.

Re: 96 Grand Cherokee Stalling
 

You have a second regulator on the engine for the return line I think.

How good is the body to engine or frame to engine or battery to the body
ground strap? One of those with a bad connection can cause your
symptoms.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

dougguitar@yahoo.com wrote:
>
> DougW wrote:
> > It should hold pressure for over 4-5 hours. Given this and your 45psi for fuel pressure I'm starting to think the regulator might
> > be shot. When you take the vac line off see if there is gas dribbling out.
> >
> > --
> > DougW
>
> OK, I timed it. After 4 minutes, the pressure had dropped from around
> 49 psi to about 35 psi. After 12 minutes, it had dropped to 20 psi. To
> add to my fun, the 96 GC does not have the fuel pressure regulator
> attached to the fuel rail: it's built into the fuel pump. @#$% There's
> just a direct connect fuel line going to the fuel rail.
>
> Will a regulator fail in this intermittent way? If that's the case,
> then I have to pony up the $300 plus for a new fuel pump. Sure wish I
> could be sure before I make the financial plunge.
>
> By the way, the coil I used was regular old AutoZone Duralast.
>
> Doug B.

Re: 96 Grand Cherokee Stalling
 

philthy wrote:
> did u replace the cap and rotor too?

I replaced the cap today. It didn't help. I have not replaced the
rotor.

Doug B.