STARTS DIES, 2002 LAREDO

  • Tiny
  • bigdog9111
  • 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
  • 20,061 posts

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
  • Member

No lights flashing or on

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Wednesday, May 18th, 2011 AT 11:46 PM
  • Tiny
  • Wrenchtech
  • Expert
  • 20,061 posts

Then you need to take a fuel pressure reading.

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Wednesday, May 18th, 2011 AT 11:55 PM
  • Tiny
  • bigdog9111
  • Member

I have 45 lbs fuel pressure

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Thursday, May 19th, 2011 AT 12:00 AM
  • Tiny
  • Wrenchtech
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  • 20,061 posts

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
  • Member

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
  • Member

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
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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
  • Member

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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  • 20,061 posts

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

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