How to diagnois problem

Asked by ironandy69 Feb 07, 2015 at 12:05 PM about the 1996 Pontiac Grand Am 4 Dr SE Sedan

Question type: Maintenance & Repair

1996 Pontiac Grand Am with a 3.1. The engine starts perfectly, but after 10-30 seconds the RPM's start to surge up and down. This behavior doesn't stop for 5-10 minutes and then it dies. I did a test I found on line and the crank sensor tested OK. (the only one I could find was a "no engine start" test). We checked the wires for breaks, but found nothing.

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mikeatpriestlake answered 9 years ago

clean fuel filter? tune up up to date? Scan for codes, check for vacuum leaks. test fuel pressure and test injector pulse. had a 91 chevy that did this and it ended up being injector problems.

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Terry answered 9 years ago

Check fuel at fuel rail and pull plug wire off and ck for fire

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