1998 cherokee no start/no spark
 

i have a 98 cherokee ,standard trans that won't start-cranks but has no spark-
no voltage with a test light
at the crank sensor harness,cam sensor harness,coil harness.i checked all
grounds that i know of
including the ground strap at the back of the head to the firewall-not frayed
at all.checked grounds by
pcm under hood,appear ok,checked grounds by coil.appear ok also.jeep was
starting fine-then i let it sit parked for 2 months-kids got in-left interior
light on-battery went dead-put in a different battery-cranks fine but won't
start-thought maybe some of gods little creatures got in there and chewed
wires-but didn't
see anything .i know i can't just try a different pcm from bone yard because
it has to be programmed
to the vehicle- anyone have any ideas -don't really have the money to take
to JEEP DEALER for
repairs.......oh and yes i did unplug and plug in crank sensor-didn't help.

Re: 1998 cherokee no start/no spark
 

A test light really isn't not much good except for testing power to
lights or a radio. Buy a volt/ohm meter then compare it against Doug's site:
http://members.cox.net/wilsond/Fixes/diagnostics.html My money's on the
Crankshaft Position Sensor.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/


"jtgreek" <u37956@uwe> wrote in message news:79272ac7638aa@uwe...
> i have a 98 cherokee ,standard trans that won't start-cranks but has no
spark-
> no voltage with a test light
> at the crank sensor harness,cam sensor harness,coil harness.i checked all
> grounds that i know of
> including the ground strap at the back of the head to the firewall-not
frayed
> at all.checked grounds by
> pcm under hood,appear ok,checked grounds by coil.appear ok also.jeep was
> starting fine-then i let it sit parked for 2 months-kids got in-left
interior
> light on-battery went dead-put in a different battery-cranks fine but
won't
> start-thought maybe some of gods little creatures got in there and chewed
> wires-but didn't
> see anything .i know i can't just try a different pcm from bone yard
because
> it has to be programmed
> to the vehicle- anyone have any ideas -don't really have the money to
take
> to JEEP DEALER for
> repairs.......oh and yes i did unplug and plug in crank sensor-didn't
help.
>

Re: 1998 cherokee no start/no spark
 

A test light really isn't not much good except for testing power to
lights or a radio. Buy a volt/ohm meter then compare it against Doug's site:
http://members.cox.net/wilsond/Fixes/diagnostics.html My money's on the
Crankshaft Position Sensor.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/


"jtgreek" <u37956@uwe> wrote in message news:79272ac7638aa@uwe...
> i have a 98 cherokee ,standard trans that won't start-cranks but has no
spark-
> no voltage with a test light
> at the crank sensor harness,cam sensor harness,coil harness.i checked all
> grounds that i know of
> including the ground strap at the back of the head to the firewall-not
frayed
> at all.checked grounds by
> pcm under hood,appear ok,checked grounds by coil.appear ok also.jeep was
> starting fine-then i let it sit parked for 2 months-kids got in-left
interior
> light on-battery went dead-put in a different battery-cranks fine but
won't
> start-thought maybe some of gods little creatures got in there and chewed
> wires-but didn't
> see anything .i know i can't just try a different pcm from bone yard
because
> it has to be programmed
> to the vehicle- anyone have any ideas -don't really have the money to
take
> to JEEP DEALER for
> repairs.......oh and yes i did unplug and plug in crank sensor-didn't
help.
>

Re: 1998 cherokee no start/no spark
 

A test light really isn't not much good except for testing power to
lights or a radio. Buy a volt/ohm meter then compare it against Doug's site:
http://members.cox.net/wilsond/Fixes/diagnostics.html My money's on the
Crankshaft Position Sensor.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/


"jtgreek" <u37956@uwe> wrote in message news:79272ac7638aa@uwe...
> i have a 98 cherokee ,standard trans that won't start-cranks but has no
spark-
> no voltage with a test light
> at the crank sensor harness,cam sensor harness,coil harness.i checked all
> grounds that i know of
> including the ground strap at the back of the head to the firewall-not
frayed
> at all.checked grounds by
> pcm under hood,appear ok,checked grounds by coil.appear ok also.jeep was
> starting fine-then i let it sit parked for 2 months-kids got in-left
interior
> light on-battery went dead-put in a different battery-cranks fine but
won't
> start-thought maybe some of gods little creatures got in there and chewed
> wires-but didn't
> see anything .i know i can't just try a different pcm from bone yard
because
> it has to be programmed
> to the vehicle- anyone have any ideas -don't really have the money to
take
> to JEEP DEALER for
> repairs.......oh and yes i did unplug and plug in crank sensor-didn't
help.
>

Re: 1998 cherokee no start/no spark
 

A test light really isn't not much good except for testing power to
lights or a radio. Buy a volt/ohm meter then compare it against Doug's site:
http://members.cox.net/wilsond/Fixes/diagnostics.html My money's on the
Crankshaft Position Sensor.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/


"jtgreek" <u37956@uwe> wrote in message news:79272ac7638aa@uwe...
> i have a 98 cherokee ,standard trans that won't start-cranks but has no
spark-
> no voltage with a test light
> at the crank sensor harness,cam sensor harness,coil harness.i checked all
> grounds that i know of
> including the ground strap at the back of the head to the firewall-not
frayed
> at all.checked grounds by
> pcm under hood,appear ok,checked grounds by coil.appear ok also.jeep was
> starting fine-then i let it sit parked for 2 months-kids got in-left
interior
> light on-battery went dead-put in a different battery-cranks fine but
won't
> start-thought maybe some of gods little creatures got in there and chewed
> wires-but didn't
> see anything .i know i can't just try a different pcm from bone yard
because
> it has to be programmed
> to the vehicle- anyone have any ideas -don't really have the money to
take
> to JEEP DEALER for
> repairs.......oh and yes i did unplug and plug in crank sensor-didn't
help.
>

Re: 1998 cherokee no start/no spark
 

forgot to mention jeep has a 4.0 engine-doesn't have fuel at fuel rail either-
-i did swapped asd relay with known good one.......-thanks for your advise
bill,i will try testing with dvom-i thought that a test light would at least
light up if there was power present at any of the connectors????

L.W. (Bill) ------ III wrote:
>A test light really isn't not much good except for testing power to
>lights or a radio. Buy a volt/ohm meter then compare it against Doug's site:
>http://members.cox.net/wilsond/Fixes/diagnostics.html My money's on the
>Crankshaft Position Sensor.
> God Bless America, Bill O|||||||O
>mailto:-------------------- http://www.----------.com/
>
>> i have a 98 cherokee ,standard trans that won't start-cranks but has no spark-
>> no voltage with a test light
>[quoted text clipped - 12 lines]
>> to JEEP DEALER for
>> repairs.......oh and yes i did unplug and plug in crank sensor-didn't help.

--
Message posted via CarKB.com
http://www.carkb.com/Uwe/Forums.aspx/jeep-cars/200710/1

Re: 1998 cherokee no start/no spark
 

forgot to mention jeep has a 4.0 engine-doesn't have fuel at fuel rail either-
-i did swapped asd relay with known good one.......-thanks for your advise
bill,i will try testing with dvom-i thought that a test light would at least
light up if there was power present at any of the connectors????

L.W. (Bill) ------ III wrote:
>A test light really isn't not much good except for testing power to
>lights or a radio. Buy a volt/ohm meter then compare it against Doug's site:
>http://members.cox.net/wilsond/Fixes/diagnostics.html My money's on the
>Crankshaft Position Sensor.
> God Bless America, Bill O|||||||O
>mailto:-------------------- http://www.----------.com/
>
>> i have a 98 cherokee ,standard trans that won't start-cranks but has no spark-
>> no voltage with a test light
>[quoted text clipped - 12 lines]
>> to JEEP DEALER for
>> repairs.......oh and yes i did unplug and plug in crank sensor-didn't help.

--
Message posted via CarKB.com
http://www.carkb.com/Uwe/Forums.aspx/jeep-cars/200710/1

Re: 1998 cherokee no start/no spark
 

forgot to mention jeep has a 4.0 engine-doesn't have fuel at fuel rail either-
-i did swapped asd relay with known good one.......-thanks for your advise
bill,i will try testing with dvom-i thought that a test light would at least
light up if there was power present at any of the connectors????

L.W. (Bill) ------ III wrote:
>A test light really isn't not much good except for testing power to
>lights or a radio. Buy a volt/ohm meter then compare it against Doug's site:
>http://members.cox.net/wilsond/Fixes/diagnostics.html My money's on the
>Crankshaft Position Sensor.
> God Bless America, Bill O|||||||O
>mailto:-------------------- http://www.----------.com/
>
>> i have a 98 cherokee ,standard trans that won't start-cranks but has no spark-
>> no voltage with a test light
>[quoted text clipped - 12 lines]
>> to JEEP DEALER for
>> repairs.......oh and yes i did unplug and plug in crank sensor-didn't help.

--
Message posted via CarKB.com
http://www.carkb.com/Uwe/Forums.aspx/jeep-cars/200710/1

Re: 1998 cherokee no start/no spark
 

forgot to mention jeep has a 4.0 engine-doesn't have fuel at fuel rail either-
-i did swapped asd relay with known good one.......-thanks for your advise
bill,i will try testing with dvom-i thought that a test light would at least
light up if there was power present at any of the connectors????

L.W. (Bill) ------ III wrote:
>A test light really isn't not much good except for testing power to
>lights or a radio. Buy a volt/ohm meter then compare it against Doug's site:
>http://members.cox.net/wilsond/Fixes/diagnostics.html My money's on the
>Crankshaft Position Sensor.
> God Bless America, Bill O|||||||O
>mailto:-------------------- http://www.----------.com/
>
>> i have a 98 cherokee ,standard trans that won't start-cranks but has no spark-
>> no voltage with a test light
>[quoted text clipped - 12 lines]
>> to JEEP DEALER for
>> repairs.......oh and yes i did unplug and plug in crank sensor-didn't help.

--
Message posted via CarKB.com
http://www.carkb.com/Uwe/Forums.aspx/jeep-cars/200710/1

Re: 1998 cherokee no start/no spark
 

does the odometer say BUSS if it does you have a bad crank sensor and if the
injectors are not firing thne you have a bad cranksensor and not a bad pcm
pcm failure in jeeps is rear thing but get replaced because people (techs)don't
know any better

jtgreek wrote:

> i have a 98 cherokee ,standard trans that won't start-cranks but has no spark-
> no voltage with a test light
> at the crank sensor harness,cam sensor harness,coil harness.i checked all
> grounds that i know of
> including the ground strap at the back of the head to the firewall-not frayed
> at all.checked grounds by
> pcm under hood,appear ok,checked grounds by coil.appear ok also.jeep was
> starting fine-then i let it sit parked for 2 months-kids got in-left interior
> light on-battery went dead-put in a different battery-cranks fine but won't
> start-thought maybe some of gods little creatures got in there and chewed
> wires-but didn't
> see anything .i know i can't just try a different pcm from bone yard because
> it has to be programmed
> to the vehicle- anyone have any ideas -don't really have the money to take
> to JEEP DEALER for
> repairs.......oh and yes i did unplug and plug in crank sensor-didn't help.

Re: 1998 cherokee no start/no spark
 

does the odometer say BUSS if it does you have a bad crank sensor and if the
injectors are not firing thne you have a bad cranksensor and not a bad pcm
pcm failure in jeeps is rear thing but get replaced because people (techs)don't
know any better

jtgreek wrote:

> i have a 98 cherokee ,standard trans that won't start-cranks but has no spark-
> no voltage with a test light
> at the crank sensor harness,cam sensor harness,coil harness.i checked all
> grounds that i know of
> including the ground strap at the back of the head to the firewall-not frayed
> at all.checked grounds by
> pcm under hood,appear ok,checked grounds by coil.appear ok also.jeep was
> starting fine-then i let it sit parked for 2 months-kids got in-left interior
> light on-battery went dead-put in a different battery-cranks fine but won't
> start-thought maybe some of gods little creatures got in there and chewed
> wires-but didn't
> see anything .i know i can't just try a different pcm from bone yard because
> it has to be programmed
> to the vehicle- anyone have any ideas -don't really have the money to take
> to JEEP DEALER for
> repairs.......oh and yes i did unplug and plug in crank sensor-didn't help.

Re: 1998 cherokee no start/no spark
 

does the odometer say BUSS if it does you have a bad crank sensor and if the
injectors are not firing thne you have a bad cranksensor and not a bad pcm
pcm failure in jeeps is rear thing but get replaced because people (techs)don't
know any better

jtgreek wrote:

> i have a 98 cherokee ,standard trans that won't start-cranks but has no spark-
> no voltage with a test light
> at the crank sensor harness,cam sensor harness,coil harness.i checked all
> grounds that i know of
> including the ground strap at the back of the head to the firewall-not frayed
> at all.checked grounds by
> pcm under hood,appear ok,checked grounds by coil.appear ok also.jeep was
> starting fine-then i let it sit parked for 2 months-kids got in-left interior
> light on-battery went dead-put in a different battery-cranks fine but won't
> start-thought maybe some of gods little creatures got in there and chewed
> wires-but didn't
> see anything .i know i can't just try a different pcm from bone yard because
> it has to be programmed
> to the vehicle- anyone have any ideas -don't really have the money to take
> to JEEP DEALER for
> repairs.......oh and yes i did unplug and plug in crank sensor-didn't help.

Re: 1998 cherokee no start/no spark
 

does the odometer say BUSS if it does you have a bad crank sensor and if the
injectors are not firing thne you have a bad cranksensor and not a bad pcm
pcm failure in jeeps is rear thing but get replaced because people (techs)don't
know any better

jtgreek wrote:

> i have a 98 cherokee ,standard trans that won't start-cranks but has no spark-
> no voltage with a test light
> at the crank sensor harness,cam sensor harness,coil harness.i checked all
> grounds that i know of
> including the ground strap at the back of the head to the firewall-not frayed
> at all.checked grounds by
> pcm under hood,appear ok,checked grounds by coil.appear ok also.jeep was
> starting fine-then i let it sit parked for 2 months-kids got in-left interior
> light on-battery went dead-put in a different battery-cranks fine but won't
> start-thought maybe some of gods little creatures got in there and chewed
> wires-but didn't
> see anything .i know i can't just try a different pcm from bone yard because
> it has to be programmed
> to the vehicle- anyone have any ideas -don't really have the money to take
> to JEEP DEALER for
> repairs.......oh and yes i did unplug and plug in crank sensor-didn't help.

Re: 1998 cherokee no start/no spark
 

We were taught in electronics school that using a 12 volt test light on
modern 'automotive' computer sensors is the best way to fry the PCM
known. It introduces 12 volts and a load to a low volt low load CMOS
system and will likely fry things.

I would almost suspect the OP was just out of gas....

Or that the new battery wasn't putting out enough volts to fire up the
PCM. The new Chrysler systems used are really bad for that.

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

philthy wrote:
> does the odometer say BUSS if it does you have a bad crank sensor and if the
> injectors are not firing thne you have a bad cranksensor and not a bad pcm
> pcm failure in jeeps is rear thing but get replaced because people (techs)don't
> know any better
>
> jtgreek wrote:
>
>> i have a 98 cherokee ,standard trans that won't start-cranks but has no spark-
>> no voltage with a test light
>> at the crank sensor harness,cam sensor harness,coil harness.i checked all
>> grounds that i know of
>> including the ground strap at the back of the head to the firewall-not frayed
>> at all.checked grounds by
>> pcm under hood,appear ok,checked grounds by coil.appear ok also.jeep was
>> starting fine-then i let it sit parked for 2 months-kids got in-left interior
>> light on-battery went dead-put in a different battery-cranks fine but won't
>> start-thought maybe some of gods little creatures got in there and chewed
>> wires-but didn't
>> see anything .i know i can't just try a different pcm from bone yard because
>> it has to be programmed
>> to the vehicle- anyone have any ideas -don't really have the money to take
>> to JEEP DEALER for
>> repairs.......oh and yes i did unplug and plug in crank sensor-didn't help.
>

Re: 1998 cherokee no start/no spark
 

We were taught in electronics school that using a 12 volt test light on
modern 'automotive' computer sensors is the best way to fry the PCM
known. It introduces 12 volts and a load to a low volt low load CMOS
system and will likely fry things.

I would almost suspect the OP was just out of gas....

Or that the new battery wasn't putting out enough volts to fire up the
PCM. The new Chrysler systems used are really bad for that.

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

philthy wrote:
> does the odometer say BUSS if it does you have a bad crank sensor and if the
> injectors are not firing thne you have a bad cranksensor and not a bad pcm
> pcm failure in jeeps is rear thing but get replaced because people (techs)don't
> know any better
>
> jtgreek wrote:
>
>> i have a 98 cherokee ,standard trans that won't start-cranks but has no spark-
>> no voltage with a test light
>> at the crank sensor harness,cam sensor harness,coil harness.i checked all
>> grounds that i know of
>> including the ground strap at the back of the head to the firewall-not frayed
>> at all.checked grounds by
>> pcm under hood,appear ok,checked grounds by coil.appear ok also.jeep was
>> starting fine-then i let it sit parked for 2 months-kids got in-left interior
>> light on-battery went dead-put in a different battery-cranks fine but won't
>> start-thought maybe some of gods little creatures got in there and chewed
>> wires-but didn't
>> see anything .i know i can't just try a different pcm from bone yard because
>> it has to be programmed
>> to the vehicle- anyone have any ideas -don't really have the money to take
>> to JEEP DEALER for
>> repairs.......oh and yes i did unplug and plug in crank sensor-didn't help.
>

Re: 1998 cherokee no start/no spark
 

We were taught in electronics school that using a 12 volt test light on
modern 'automotive' computer sensors is the best way to fry the PCM
known. It introduces 12 volts and a load to a low volt low load CMOS
system and will likely fry things.

I would almost suspect the OP was just out of gas....

Or that the new battery wasn't putting out enough volts to fire up the
PCM. The new Chrysler systems used are really bad for that.

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

philthy wrote:
> does the odometer say BUSS if it does you have a bad crank sensor and if the
> injectors are not firing thne you have a bad cranksensor and not a bad pcm
> pcm failure in jeeps is rear thing but get replaced because people (techs)don't
> know any better
>
> jtgreek wrote:
>
>> i have a 98 cherokee ,standard trans that won't start-cranks but has no spark-
>> no voltage with a test light
>> at the crank sensor harness,cam sensor harness,coil harness.i checked all
>> grounds that i know of
>> including the ground strap at the back of the head to the firewall-not frayed
>> at all.checked grounds by
>> pcm under hood,appear ok,checked grounds by coil.appear ok also.jeep was
>> starting fine-then i let it sit parked for 2 months-kids got in-left interior
>> light on-battery went dead-put in a different battery-cranks fine but won't
>> start-thought maybe some of gods little creatures got in there and chewed
>> wires-but didn't
>> see anything .i know i can't just try a different pcm from bone yard because
>> it has to be programmed
>> to the vehicle- anyone have any ideas -don't really have the money to take
>> to JEEP DEALER for
>> repairs.......oh and yes i did unplug and plug in crank sensor-didn't help.
>

Re: 1998 cherokee no start/no spark
 

We were taught in electronics school that using a 12 volt test light on
modern 'automotive' computer sensors is the best way to fry the PCM
known. It introduces 12 volts and a load to a low volt low load CMOS
system and will likely fry things.

I would almost suspect the OP was just out of gas....

Or that the new battery wasn't putting out enough volts to fire up the
PCM. The new Chrysler systems used are really bad for that.

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

philthy wrote:
> does the odometer say BUSS if it does you have a bad crank sensor and if the
> injectors are not firing thne you have a bad cranksensor and not a bad pcm
> pcm failure in jeeps is rear thing but get replaced because people (techs)don't
> know any better
>
> jtgreek wrote:
>
>> i have a 98 cherokee ,standard trans that won't start-cranks but has no spark-
>> no voltage with a test light
>> at the crank sensor harness,cam sensor harness,coil harness.i checked all
>> grounds that i know of
>> including the ground strap at the back of the head to the firewall-not frayed
>> at all.checked grounds by
>> pcm under hood,appear ok,checked grounds by coil.appear ok also.jeep was
>> starting fine-then i let it sit parked for 2 months-kids got in-left interior
>> light on-battery went dead-put in a different battery-cranks fine but won't
>> start-thought maybe some of gods little creatures got in there and chewed
>> wires-but didn't
>> see anything .i know i can't just try a different pcm from bone yard because
>> it has to be programmed
>> to the vehicle- anyone have any ideas -don't really have the money to take
>> to JEEP DEALER for
>> repairs.......oh and yes i did unplug and plug in crank sensor-didn't help.
>