Question about 2004 Pontiac Grand Prix
I had the same problem. check the mass airflow sensor. it may be blocked with leaves and debris, or may need to be replaced. mine was blocked with leaves, i had to try to start it several times, but after i drove it a little then tried again. it starts everytime.
Posted on Jan 31, 2009
A couple of things come to mind. First, its possible the IAC motor (Idle Air Control) may not be working properly. The IAC opens and closes according to signals from the computer in order to maintain idle because the throttle body plate is closed. When you press down on the gas pedal some, that opens up the throttle body plate allowing air to flow in. If the IAC is not working properly it could choke off the air the engine needs to idle correctly.
Another possibility is that the MAF sensor is not working properly. A not so fool proof way to determine if this is the case is to just disconnect the MAF sensor connector and try and start the car again. If the engine idles like it should, its possible the MAF is bad. Reconnect it and if the problem comes back, its a fair bet the MAF is not working properly.
There is also an online community for the Grand Prix that you can visit by going to www.grandprixforums.net, sign up and post up your problem there and see if anyone there has some ideas as well.
Posted on Jan 01, 2009
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Posted on Jan 02, 2017
I had a similar prob where I needed to hit the gas to start my car, turned out the throttle body was all gummed up, after fishing it out, problem went away..
Posted on Oct 09, 2012
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