Mechanics

STARTS DIES, LAREDO

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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Bigdog9111
May 18, 2011.




Do you have a security light on or flashing when you try to start it?

Wrenchtech
May 18, 2011.
No lights flashing or on

Tiny
Bigdog9111
May 18, 2011.
Then you need to take a fuel pressure reading.

Wrenchtech
May 18, 2011.
I have 45 lbs fuel pressure

Tiny
Bigdog9111
May 19, 2011.
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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Wrenchtech
May 19, 2011.
We just tested fuel pressure again and its 51 lbs, running or not.

Tiny
Bigdog9111
May 19, 2011.
I figured out whats dropping out, injector pulse is dropping out just before it dies, what next ECM?

Tiny
Bigdog9111
May 27, 2011.
Is it the power side dropping out of the ground trigger side?
Also be sure that the spark isn't dropping out with it.

Wrenchtech
May 27, 2011.
We r losing the ground side of the injector pulse.

Tiny
Bigdog9111
May 27, 2011.
And are you sure that the spark is not dropping with it. Did you see any spark after the injector pulse had dropped out?

Wrenchtech
May 27, 2011.

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