Question about 1991 Pontiac Grand Prix

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1991 3.1 liter engin starts then immediately

1991 3.1 liter engine starts then immediately stalls. Changed crank sensor. No help. What next ???

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First you need to see if you have spark to the plugs or if you are loosing fuel pressure. With the type of problem you are having it is best to check the basics because it can get expensive just changing parts, A real common problem for these cars is in the security system, there are two little white wires in the ignition switch that have a habit of breaking, if this is the case it will give the symptoms you describe, With it shoutting off it is your cars way of saying someone is trying to steal your car and will not allow it to run.

To be honest with you this type of a problem I would suggest having a diagnostics run on it at an honest repair shop just because it can get tricky and expensive if not checked properly.

Good Luck and I hope this helps, Any more questions feel free to ask.

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Posted on Oct 02, 2009

Testimonial: "I am very happy that I received a response. I agree with the suggestions mostly. I have tried many things except the wiring in the ignitiion. Thanks."

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There is a pass lock sensor that is part of your ignition lock cylinder. there is two little white wires that come of that read the resistance of your key. is there a little black thing on your key. if so key may be the problem also. the pcm can cut injector pulse when internally malfunctioning. wish you gave me more details....

Posted on Oct 02, 2009

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