Question about 1999 Pontiac Firebird

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Car hard to start. Car will emit

Car hard to start. Car will emit "smoke" out of tailpipe once started. "Bucks", "backfires, when going down road. Replaced EGR valve with no improvements.

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  • lvierling Jul 13, 2009

    Could my problems be with the temperature sensor unit? I recently replaced the thermostat in the car.

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You could need a tune up. Remove a few of the spark plugs and look to see if they are black with carbon (black hard and flaky residue) or black with oil. When you check it, make sure its sat for at least half the day, but a full day would be best. If its covered in oil then you have bad valve guides and could require major engine work, or just some valve seals to stop the leak. The bucking and backfires could be caused by a faulty TPS or ignition module. Its a start.

Posted on Jul 13, 2009

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Posted on Jan 02, 2017

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