1990 firebird formula 3.1l engine starts up and cuts off after depress gas pedal down


Asked by Dec 17, 2013 at 08:01 PM about the 1990 Pontiac Firebird Formula

Question type: Maintenance & Repair

after depress gas pedal down  have replaced spark plugs, wires ,cap , rotar
,ignition coil,ignition module stumpped please help engine only has 91000 original miles one owner

1 Answer

Norm Davis

Sounds like a bad throttle position sensor (TPS). On your car it's mounted on the throttle body. If you're handy with a voltmeter, it's easy to check if the TPS is working correctly. It needs to show .55 V at closed throttle. The other possible fault is with the Idel Air Control (IAC) valve.

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