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1996 Pontiac Bonneville Question: Possible bad fuel pump???

 

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amason101070, 3.8L V6, Middle Village, NY, June 27, 2009, 18:22
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Car turns on right away, but when i'm driving, the engine revs up. It almost feels as if the engine is choking and gasping for air. I just drov 75 miles from my home. the rev comes and goes. I did a stretch of over 25 miles without anything happening. The power drops too. My alternator is new and I just has the fuel filter replaced this morning. Any advice would be much appreciated.

Thanks,

Ron

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  • Answer #1

    patrick mannion from Greg Solow's Engine Room, June 28, 2009, 09:56
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     Master

    Its so hard to guess at the problem without being able to experience the problem first hand or be able to drive the car. The problem could be caused by a multitude of problems. I wonder if the problem is the transmission that is slipping or a restriction in the exhaust that is causing back pressure and not leaving exhaust out of the engine. Checking fuel pressure by tapping into the fuel line and taping the fuel pressure gauge to the windscreen prior to test driving the car. Drive the car and see whet the fuel pressure gauge reads when you experience the problem. It would be interesting to see if you are loosing ignition when you experience the drivability problem .I do not have great experience with Pontiac but to diagnose this type of problem I usually end up attaching a scan tool to the diagnostic socket under the dash and or an oscilloscope on any sensor I feel may be failing (crank angle and cam sensors are real important as to is the air flow meter signal to the computer).

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