Question about 1999 Jeep Cherokee

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99 jeep grand cherokee no start 4.0L no power to injectors no spark no communication with pcm

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Check the auto shut down (ASD) relay located in the power distribution box.

Posted on Jul 23, 2010

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My grand cherokee 1994 engine not starting no communication with the DRB and check engine light


I assume your speaking of a automomtive scanner when you mentioned no communication. Check the fuse for you PCM, its thats good your cars computer or PCM may have failed.

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Try resetting the asd "auto shut down fuse had a similar problem the jeep would crank but did not get spark or gas also check your fuel pump? and the asd relay may be bad it will prevent the jeep from getting no spark and will not fire some jeeps have security problems

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4.0 engine swap limititations


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May 19, 2009 | 1999 Jeep Grand Cherokee

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IF YOU PULL OUT CAM SENSOR YOU HAVE TO PUT A TOOTH PICK IN THE TWO HOLES ON THE TOP AND THEN PUT IT BACK IN AND FACE IT TO THE BACK OF THE ENGINE.KING OF 4.0

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The crankshaft position sensor was seriously problematic in those old jeeps. It's located towards the top of the bell housing slightly to the driver's side I think.

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A COMMON PROBLEM I'VE SEEN MANY TIMES IS THE CRANK SENSOR DISRUPTING COMMUNICATION WITH PCM. UNPLUG THE CRANK SENSOR AND CHECK FOR RESPONSE OF PCM. IF COMMUNICATION IS NOW POSSIBLE YOU HAVE A BAD CRANK SENSOR. IT'S A PROBLEM I'VE SEEN NUMEROUS TIMES. DOUBLE CHECK YOUR TIMING.

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