Starts dies, 2002 Laredo

Tiny
BIGDOG9111
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  • 2002 JEEP GRAND CHEROKEE
  • V8
  • 4WD
  • AUTOMATIC
  • 180,000 MILES
I have a 2002 grand cherokee laredo, it wont stay running, starts dies, changed fuel filter, no codes.
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Wednesday, May 18th, 2011 AT 9:39 PM

16 Replies

Tiny
WRENCHTECH
  • EXPERT
Do you have a security light on or flashing when you try to start it?
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Wednesday, May 18th, 2011 AT 10:46 PM
Tiny
BIGDOG9111
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No lights flashing or on
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Wednesday, May 18th, 2011 AT 11:46 PM
Tiny
WRENCHTECH
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Then you need to take a fuel pressure reading.
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Wednesday, May 18th, 2011 AT 11:55 PM
Tiny
BIGDOG9111
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I have 45 lbs fuel pressure
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Thursday, May 19th, 2011 AT 12:00 AM
Tiny
WRENCHTECH
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You're going to have to determine what is dropping out when it dies, either spark, injector pulse or fuel pressure. This is not adding up. Fuel pressure and security systems are the things that act that way.
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Thursday, May 19th, 2011 AT 12:03 AM
Tiny
BIGDOG9111
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We just tested fuel pressure again and its 51 lbs, running or not.
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Thursday, May 19th, 2011 AT 1:07 AM
Tiny
BIGDOG9111
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I figured out whats dropping out, injector pulse is dropping out just before it dies, what next ECM?
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Friday, May 27th, 2011 AT 1:15 AM
Tiny
WRENCHTECH
  • EXPERT
Is it the power side dropping out of the ground trigger side?
Also be sure that the spark isn't dropping out with it.
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Friday, May 27th, 2011 AT 1:19 AM
Tiny
BIGDOG9111
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We r losing the ground side of the injector pulse.
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Friday, May 27th, 2011 AT 9:07 PM
Tiny
WRENCHTECH
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And are you sure that the spark is not dropping with it. Did you see any spark after the injector pulse had dropped out?
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Friday, May 27th, 2011 AT 9:09 PM
Tiny
BIGDOG9111
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There was still spark after injector pulse dropped out
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Friday, May 27th, 2011 AT 9:28 PM
Tiny
WRENCHTECH
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That seems to be point to a bad PCM but that is very difficult to confirm.
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Friday, May 27th, 2011 AT 9:30 PM
Tiny
BIGDOG9111
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What if the spark and pulse dropped at the same time.
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Friday, May 27th, 2011 AT 9:59 PM
Tiny
WRENCHTECH
  • EXPERT
Then you would look at the Crank sensor or related wiring.
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Friday, May 27th, 2011 AT 10:12 PM
Tiny
BIGDOG9111
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Well we replaced the crank trigger, still wouldnt start, got another crank trigger, still wouldnt start, just back fired, put the original crank trigger back in, now we r back to starting then dieing
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Sunday, June 5th, 2011 AT 3:11 AM
Tiny
WRENCHTECH
  • EXPERT
Closing question
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Thursday, June 30th, 2011 AT 11:31 PM

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