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Friday, May 25, 2012

1999 Jeep Grand Cherokee: Stalls and Quits Running?

The jeep starts and runs fine,then suddenly in between driving it stalls and then quits completely.It will only start after waiting for few minutes.
But same procedure for stall and quit repeats.

In this case there are few basics that needs to be checked.
It can be weak or dirty fuel pump or faulty fuel filter or its the issue with spark plugs.
But if all this are checked ok or are already been replaced properly then,

the most common cause of this is a faulty crankshaft position sensor. It sends a signal to the computer for when engine is at TDC that controls sychronizing the firing of the fuel injectors and plugs. when this signal is lost, then engine just dies. When engine dies, the computer as well as the crank sensor resets, so signal is restored which is why it will recrank without waiting 10-20 minutes.And starts in few minutes say 3 to 5 minutes.

Also you can try retrieving the error codes stored in the ECM computer and see if there are any codes in it.


To pull codes, turn ignition key to on-off-on-off-on, leaving it in on position. The check engine light will flash a series of blinks. Count the blinks. Three long blinks, pause, followed 2 long blinks would be code 32 for example.

Most of the time the cran sensor will not set a fault code unless it has a hard failure - no start condition.


This details will help.
Thanks.


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