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Pontiac Grand Prix: Problems & Solutions

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  • jamie1022jamie1022 Posts: 6
    Hey cornellpinoy ... I have figured out that being on an incline or decline doesn't make a difference. It just randomly won't start. I had it towed to a shop last Wednesday and by Thursday they were calling me to let me know that it had been starting the entire time so they were unable to determine what the problem was. I had to go pick it up and it has worked fine again until today. It won't start again now? UGH! Should I take it to another shop? THANKS AGAIN!
  • donahmjdonahmj Posts: 2
    1999 GTP 140000 miles.
    have replace 02 sensor. other normal maintenance battery etc.

    Had a problem awhile back that involve a vacuum activated fuel control valve on front of engine. The problem is that is was pulling too much vacuum. I was getting a fuel to lean code. I replace the valve, the vacuum hose ( before I determined the problems was too much vacuum. I capped off the line and valve. runs fine with no engine light.

    Now I am having this race condition, and I think it might be related. Problem has be intermittent. Could be heat related I live in Texas? and so far no codes.
  • donahmjdonahmj Posts: 2
    Can't answer your question? but I have a 99 GTP and have been to 110 with plenty of petal left. I was on the highway trying to pass a bunch of cars that kept cutting me off. It was as smooth as glass. Anyway why do you need to go that fast.

    don't wreck your sweet ride.
  • onyx1onyx1 Posts: 2
    Has anyone experienced this problem? My 1999 GTP quits sporadically while driving without any prior indication. Specifically, while driving at any speed the car just stalls out..... However it starts back up once I pull over and put it in park. There are also times when I can feel the sputter of the engine like it is going to stall but if I it the gas a few times I can keep it running however the tac goes to zero and stops working until I restart the car. I have had it into the dealer twice and they can not find any codes being stored to narrow down the problem. Help!
  • onyx1onyx1 Posts: 2
    Has anyone experienced this problem? My 1999 GTP quits sporadically while driving without any prior indication. Specifically, while driving at any speed the car just stalls out..... However it starts back up once I pull over and put it in park. There are also times when I can feel the sputter of the engine like it is going to stall but if I it the gas a few times I can keep it running however the tac goes to zero and stops working until I restart the car. I have had it into the dealer twice and they can not find any codes being stored to narrow down the problem. Help!
  • bobcainbobcain Posts: 1
    Have the same problem!!!! A mech . told me to have the crank Angle sensor checked.(C.A.S) and that this is probably the problem.
  • Hello,
    I have a 99 Grand Prix GT that keeps stalling. From these Forums I've heard that the crank sensor can be faulty. What kinda job is this to change? is it something that i can do myself or should i take it to a garage and do it? I have some experiene with engines, but not a whole lot.

    I've also heard stories of guys having faulty starter solenoids. Could this be the problem?

    :sick:
  • My suggestion is for you to check out the IAC valve. It's located on the top and rear of your motor.
  • I have just finished about two months of troubleshooting the same issue. You may or may not be getting the Service Engine Soon light when you have this problem. The source of my trouble was the crankshaft sensor. This supplies the signal for the ignition and the tach to your Ignition Module and your PCM (PowerTrain Control Module)- i.e. Car computer) The paret can be had at AutoZone for around $25.00 and it takes a mechanic 1 to 1.5 hours to change. I went to a small town where I used to live and got a very good rate on the work ($61.00) and things are now fine. Be cautioned, however, if this has been going on a while, there is a VERY good chance your catalytic converter has been trashed because the ignition hasn't been right and a lot of fuel was dumped in there. I had to replace mine twice while I figured out what was wrong. I had three mechanics look at it and they recommended everything from the car computer to Ignition Module & Coil packs. I recommed www.convertersexpress.com for finding a cat for your car (mine was $150.00 shipped) it is a fairly simple task to replace it. Hope this helps
  • gtpguy1gtpguy1 Posts: 1
    I had the same symptoms with my 97 GTP @ 150,000 miles - it would start and than stall immediately in hot weather. It would sometimes start and run OK in cooler weather and than stop after driving when it got hot. Sometimes the car would run OK again after being allowed to cool off for 30 minutes. The problem got worse until I could not drive the car.

    After much parts changing and $$$ spent I discovered that the fuel pump electrical circuit has an .8 ohm power resistor that was going open intermittently at high temperature. I replaced the resistor with GM PN 88951182 ($40) and it fixed the problem.

    You can diagnose this problem yourself when the car won't run by disconnecting the resistor (it is in the right front wheel well) and jumping the mating connector with a paper clip. If the car runs with the jumper installed you will know that the resistor is the problem. However, the resistor and connector is hard to access so you may want to just
    go ahead and have it replaced now rather than wait for it to fail again so that a positive diagnosis can be confirmed.

    Good luck - hope it helps!
  • jbd1jbd1 Posts: 1
    zujo,
    I have the same problem with my 99. A mechanic friend of mine told me to spray dry graphite in the key slot and then blow in there with a straw, It worked! and lasted about a year before I needed to do it again. Don't be suprised if the car still goes (ding,ding,ding) after you take the key out. That part didn't bother me as long as I can get the key out.
    jbd1
  • I had the Mechanic look at my car that was stalling. He drove it and it stalled on him. He saw the fuel pressure go to zero at that time. Checked the fuel pump and it was fine so he looked at where it got its power from. He found some bared power wires for the fuel pump that go to the relay. It was some where right close to the PCM. He changed those. Its running fine right now, but its only been a few days. hope it works. thanks.
  • I have a 99 grand prix gt the son of gun will start, then when it starts warming up a little it starts pitting and sputting, then goes dead! I have had new plug wires, plugs, and coil packs put on. Still it is doing the same thing. I have noticed when you are FORCING the car to stay running the car is dumping oil and gas out the tail pipes. PLEASE HELP!!!!!!!
    THANK YOU ALLhttp://a332.g.akamai.net/f/332/936/12h/www.edmunds.com/media/townhall/webxicons/emotorc- ons/emo_bawling.gif
    cry
  • solussdsolussd Posts: 1
    I'm having the same problem. I have a 1997 grand prix gtp. My ABS light turns on after less than a minute of driving. Sometimes the brake warning light does as well. This started happening a couple days ago. My air conditioning also stopped working when this happened (???). I replaced my alternator, it was going out anyway (fluctuating voltage).did you ever get yours fixed?
  • Hi:),i recently bought a 1995 GrandPrix SE from my uncle,and my Antilockbrake light started coming on right after i started driving it.The problems have been getting worse,such as trouble starting the car,having to push really hard on the accelerator peddle just for the car to go forward like all the other cars are on the street(haha),and the lights on the instrument panel are flickering.I took it to a local walmart,and they tested the battery ,and alternator ,and both are fine(everyone i spoke to said it was the ALT,or Baterry).By the way the car would also seize up on the road ,and it would manage to be restarted.I have had to leave it in my underground parking garage,and can no longer drive it anywhere,including my mechanic.
    Please help!Thankyou!
  • Hi,as it turns out i thought i would need to replace both the battery or alternator ,but according to the walmart technician,the battery ,and alternator were deemed fine,and in no need of being replaced.I was hoping there was something wrong with at least one of them ,because now i have no idea what to think :(
  • I have been having this problem for a few months. The car will start fine.I will go into a store come out and it wont start. Sometimes for as long as 3 hours. I wait and go back the next day and it starts fine. It also stalls as I am driving. It turns over with no problem but wont start up. My mechanic has had it for 4 weeks and cannot figure it out. Pontiac says it is a fuel pump and wants to charge me 675.00 to replace it. My mechanic told me that the fuel pump looks OK. There is no check engine light Therefore it does not show up on a diagnostics check. It doesnt matter if the car is hot or cold. It just randomly will not start or will just die on me. Any help would be appretiated
  • I should have noted that the car in message #362 is a GT with the 3800 engine. I dont no if that matters or not.
  • We have noted recently a creaking and grinding coming from the dashboard of our 2005 GTP Comp G. The sound started after the defective computer in the car was replaced, and got worse after warranty work was done on a defective windshield trim; now it has become unbearable. The car has been back to the dealer several times, but they have not been able to fix the problem, or even reduce it; Pontiac Customer Assistance has tried to be helpful as well. The dealer is now saying that the problem was due to use of ArmorAll when the car was detailed, affecting the interface between dashboard panels; I find this a bit difficult to accept. Has anyone else had a similar problem? The noise is driving my wife crazy, and we are now planning to cut our losses and trade in the car on another brand, as Pontiac is not willing to make any concessions on trade-in value to entice us to switch to a new G6 GTP. :(
  • gmfan007gmfan007 Posts: 77
    I was driving in town this week with AC on when suddenly AC and fan went off; trip computer digital readout went black; power windows worked very slowly; and I could manually shift between 2nd and 3rd. No 1st gear or 4th. Engine ran fine, but no power because it would start out in 2nd from a stop. Drove straight to the garage without shutting it off. Smart move because it would not start once I shut off the engine. Turns out the battery went dead because the alternator had "zero output". Transmission was not shifting properly because it is electronic shift according to the dealer. Never saw the dash battery light come on .... no warning. It was scary and I thought I had major issues. They replaced the alternator (GM part with life time warranty), re-charged the battery and everything is fine now.

    Sounds like you have similar symptoms. Maybe your alternator has less than optimum output or a loose connection causing intermittent problems.
This discussion has been closed.