Question about 1996 Pontiac Sunfire

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My 96 sunfire 2.2 l auto idels rough and blows out black smoke when i rev up the motor. i also hesitates on the highwy

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  • mr_fish_ca Oct 09, 2009

    thank you so much for your reply. I have changed the plugs and they were all black. I also did a compresssion check and I was between 145 and 155lbs. my problem appears to be across the board. I was coming home to day on the highway and I had to shift into neutral and rev the motor to blow out the rich mixture. Lots of black smoke. I have also changed the fuel filter and the oxygen senser at the manifold.

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Black smoke is from too much fuel, or a mis-firing of the spark plug. Pull all plugs to look to see if one is blackened. If so, this is your troubled cylinder. You can test each spark plug wire with a High energy spark plug tester. If that looks OK, then do a compresion test to see if the mechanical part of the engine seems good.

Posted on Oct 08, 2009

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