Question about 1999 Pontiac Grand Am GT

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Help, My car won't start!!!!!

I have a 99 Pontiac Grand Am, 3.4 L engine. About three weeks ago we were driving down the road about 55 mph and the car just shut off. It would not start after that. A week before this happened we replaced the plugs and wires because it was kinda missing (if that's how to describe it). The week before that we replaced the throttle positioning sensor because when you we stopped and the car was in gear it would rev way up. That did not fix the problem. Since the car quite we have put new coil packs and a module on it and it did not fix the problem, the car still will not start. and if it even tries the motor shakes and backfires really bad. Can someone please help me. Oh yea now when we turn the key to the off position the trunk pops:( I can live with that though I just need it to run again.

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  • pattywacks Oct 22, 2008

    Actually my husband left the key on and now when we are trying to start it the car has to be hooked up to someone elses vehical.....but the battery was brand new about 2 months before. This would make the car start at some points and just run really really rough for a few seconds? Should we be holding the gas down when we are trying to start it? My husband says this is the only way to get it to even start!:(

  • Anonymous Apr 03, 2009

    My 1999 Pontiac Grand Am won't start. It was covered with snow all week and will turn over but will not start.

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Honestly to me it sounds like a charging problem. Was the vehicle's alternator charging properly? Is the vehicle's battery dead? As you are probably aware, newer vehicles have multiple computers that monitor various functions. Some of these functions rely on only the slightest voltage or need the full 12 volts (actually closer to 14v.) supplied by the charging system. if the charging system isn't functioning properly, then it's very likely that you could experience such issues. Also many newer vehicles will essentially have to relearn how to function if there is a voltage variance issue. Consequently the trunk issue might have something to do with that. hope this helps.

Posted on Oct 22, 2008

  • Evan Jenson
    Evan Jenson Oct 23, 2008

    The issue may still be within the charging system (alternator). If your car's electronics are still only relying on battery power and not the alternator, then the voltage to maintain them is not going to be consistent. As you drive on battery power alone, the electronic systems are going to be a constant draw on the relatively low amperage that the battery has available. Ultimately the battery will run down and then not be able to sustain the ability to keep all the electronics functioning properly. As for the issue of rough idling, once the electronics have the proper voltage, then all the sensors will be able communicate properly with their associated computers (ECM, BCM, ABS Controller, Etc.) Hope this helps.

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Posted on Jan 02, 2017

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