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Sedans Pontiac Grand Prix Pontiac Grand Prix Starting / Stalling Issues
208 messages, Last post on Nov 02, 2009 at 2:18 PM
You are in the Pontiac Grand Prix Forum. Your Hosts are pat & karens
 I have a 1999 Grand Prix GTP and was driving, clipping along like she likes to do, when she just stopped running. I had her towed where the fuel sensor was replaced. She still had a "hesitation" in her purr.It was slight,I noticed because I know my car.Again while driving she stalled and again she was towed.Needless to say $3000 and four tows later,the offical diagnosis from the mechanics was theres nothing wrong,there are no codes so its posessed or just doesn't like me anymore. Of course,I pulled out of their lot...and stalled! Is there any info from GM or through any less opinionated mechanics that can help me? I love my car and she only has 118,000 miles. I take excellent care of her but when you open the hood it looks nothing like my 1970 Cutlass w/ 350 Rocket. I Know being female with a dead car is a total disadvantage but since so many others have had and are having this problem SOMEONE has to be able to help.
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Replying to: madmamma (May 30, 2009 4:20 pm) |
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has anyone ever encountered these oddities -Scan tool shows 2 PCMs when there is only 1 -Updating the software crashes computer x2 on 3rd attempt it took update. - Crankshaft position sensor shows a difference of only a few RPMS then in a second Shows a difference of 1000RPM (crankshaft position sensor is new|). My guess bad PCM or Crankshaft sensor????? Techs have never come across this before. 2005 pontiac grand prix 3800v6 no bells or whistles johnarenburg  live.ca
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My Grand Prix GTP has 109,000 miles on it. A few days ago it began to stall on me. When the engine is cool, be it the first start of the day or after setting for a few hours, it will run fine for 10 to 15 minutes. After 10 to 15 minutes the engine begins to run extremely rough and will stall within 5 to 10 seconds. I have changed the fuel filter, all 3 coils, plug wires, and spark plugs but this did not help any. Does anybody know what the problem might be?
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Replying to: jogle (Jun 02, 2009 8:49 am) |
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Replying to: bleukrayons (Mar 17, 2008 12:19 pm) 
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My car will start fine when it is in the garage or the weather is cool. If it sits out in the hot sun, the car will not start. I open the hood and all the doors and the car will start after it cools. Takes anywhere from 15 minutes to several hours depending on how hot it is. There is power, but it will not turn over. Have had the control module replaced along with the crank sensor. Thought it was fixed then weather warmed up a week later and it is the same thing again. Any idea what the heck may be the problem? The other issue has been the key stuck in the ignition. Not always, rather randomly. Have replaced the key and the tumblers in the ignition. Helped for about two weeks. Again, any help would be appreciated.
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I have a 1997 Grand Prix Gtp Supercharged 3800 3.8L and have been having problem that even the mechanics cant figure out. After starting the car it runs great for about 5 to 10 mins till it gets warmed up. Once warmed the car's rpm gauge jumps between 400 rpms and 1200 rpms, this only happens when slowing to a stop (under 25 mph) and sitting in drive or park. if continuing to run the car's rpms will jump lower and lower until it sputters and stalls out. Once this has happened if you turn the key just enough to turn the radio on but not start the car the rpm gauge will jump slightly. We have replaced the mass air flow sensor, the idle air control valve (which actually made it run worse), repaired exhaust manifold gasket leak, checked vacuum lines (no leaks), tune up (spark plugs and spark plug wires), and oil change. After doing everything but the idle air control valve the car ran great for about half a day then the same problem. We also have a knocking coming from the supercharger. A mechanic said it will eventually need to be replaced and may be causing the problems but cant be sure. The car has awesome power and runs great except when under 25mph. I am in dire need of some help! Cant keep dumping money into this car forever! Starting to get to be more than its worth. Also the driver information center is very very dim, can not read it unless the sun is shining directly on it. Have any ideas? Can definitely live with it but just figured id mention it! Anyways Thank you for any help!!! 
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Replying to: dainz (Nov 30, 2007 9:03 am)
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Replying to: bighurt (Jul 29, 2009 9:44 am) |
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