Question about 1999 Pontiac Grand Prix

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1999 pontiac grand prix 3.1 starts great but sputters throttling

1999 3.1 litre pontiac grand prix. the car will always start and idles ok and runs great. but sometimes when it starts just barely touching the gas pedal the motor will start sputtering this will not stop. normally let the car sit for about 10 minutes and restart.

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Check tps sensor check idle air control valve or iacv for proper func

Posted on May 09, 2010

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1 Answer

Where is idle sensor loated on 1999 grand prix


Idle Air Control is on the throttle body itself, small barrel shaped. Can be cleaned if carbon build up on the pintle is the problem.

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My Pontiac Grand Prix is also a 99, it has 216,+ thousand miles on it, it runs great, idles good, I need to replace the oxygen sensor tho as it shuts off on me while driving or sometimes coming to a stop. You might try checking the fuel filter and pump as well.

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The next thing to try in regards to the stalling would be to change out the Throttle Position Sensor this sensor is the usual cause of this symptom.

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A cause for that would be an oxygen sensor getting wet, the one on the inlet side of the catalytic converter.

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Here is the most common cause of surges and stalls and low idle rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

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Jun 24, 2008 | 1993 Pontiac Grand Prix

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