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Why does a '97 Pontiac Grand Prix engine shut down at any speed without obvious cause?


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Answered 2011-09-13 23:43:25

Change the fuel filter and have the ignition module checked out.

This is a good place to start. I realized my shutdowns occured when the car was running above 230 degree's and usually around 2500+ rpms. I could never get it to fail for the dealer in their parking lot.

I found after a full diagnostic process of replacing sensors, plugs, wires, steering column wiring harness, coils, ICM and numerous hours of research in many on line forums, that the Crankshaft sensor was failing. I had to replace it twice in the last 3 years.

It is behind the Harmonic balancer and will require you to have a steering wheel puller to remove the balancer. I used an over sized socket to drive it back on to the crankshaft far enough to get the bolt to seat it and torque it to the specs.

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