Question about 1991 Pontiac Firebird

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Check engine light coming on

When traveling and constant highway speeds, the check engine light comes on and stays on until slowing to lower speeds or stopping and restarting the car.

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  • tigger2009 Dec 01, 2008

    well i wouldbe driveing down the road like going 60 65 and the check engine light will come on then when i stop and pull over turn off the car site for like 5min the light will be off


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Also could be something like a aftermarket exhaust, I put a cherry bomb on my 89 and the check engine light always turns on after about 3 miles of driving im told its not enough backpressure in the exhaust but it doesnt harm anything

Posted on Nov 24, 2008

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Valve body issue with trans

Posted on Nov 12, 2008

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