Last post on May 15, 2013 at 6:16 PM
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Pontiac Grand Prix, Engine, Sedan
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#344 of 360 STARTING ISSUES...I'M LOST PLEASE HELP!
Jan 09, 2013 (5:32 pm)
Ok, I have been working on this for a few weeks with no solution. I have a 2002 Pontiac Grand Prix GT that is having starting issues that are getting worse. It takes several attempts and needs me to give her a lot of gas to get her to start. Once started, if she doesn't stall in the first 5-10 seconds, I am good to go...runs like a champ. Battery is new, starter new, alternator new, new intake gaskets (upper and lower), new upper manifold, new coolant tubes, and new valve cover gaskets. The problem started before all these new items were put in. I am guessing it is a sensor (MAP/MIP) or another one but they are way to expensive to "guess". A fuel issue? Any help you could give would be much appreciated.
Jan 09, 2013 (9:49 pm)
Looks like you have done extensive work done but you don't mention anything about the spark plugs. That is usually a good place to start because it is cheap and easy and the sparks will tell if you have any issues with any cylinder or with the spark plug wires.
Your problem sounds like an old carburator choke problem, you sure they didn't slip in a carburator when all the work was done Mass Air flow can be another suspect but it gives a code, are you getting any codes. Mass Airflow costs $130 - 180 non GM, (I got 2 re-manufactured ones, they both failed ended up getting a new one for a $30 more), it is a 5 minute job to replace it.
#346 of 360 Re: starting issues [pontiaclives]
Jan 10, 2013 (12:29 am)
Thanks for replying so quickly. No, I have a code reader and it is not throwing any codes The "check engine" light came on once last week for about 10min and went off...no codes. I was debating about the spark plugs but I didn't know that if the spark plugs are bad the car can still start.
So let's say it is a "carburator choke problem" what am I looking at to solve the issue? If you can't tell I am an amatuer home mechanic. I enjoy working on the car but this pontiac is one thing after another. Thanks for all the help!
#347 of 360 Re: some time it wont start [prettyb]
Jan 12, 2013 (8:39 pm)
did you get this resolved? I have a 2004 grand prix gt2 that is doing the exact same thing! Never know if I go to get in my car if it will give me problems starting. Sometimes it starts right up, other times I have to give it a few trys. I dont want to spend money guessing what it is and put money into the car that isnt needed. Help please!?!
#348 of 360 Re: some time it wont start [jenb2011]
Jan 12, 2013 (9:53 pm)
NO, NOT YET!! It is getting very annoying. I checked the output on the battery and alternator again today and they are fine. It is below zero with the windchill here but it just started without a problem...that only happens once in a great while. I have no clue what to do...I think I am going to replace the spark plugs and O2 sensors and see what, if anything, that does. Let me know if you figure anything out.
#349 of 360 Stalls while driving and runs rough
Feb 22, 2013 (11:23 pm)
I have a 2003 Grand Prix GTP supercharged with 95xxx. The car was running great and all of a sudden I'm sitting at a light and the car shuts off and sets a check engine light. I go to restart and it and it wont restart without giving it some gas. Once it started it the idle fluctuated between 200 and 1000 rpm's. It set code P102. I noticed while the car running at idle i unplugged the IAT and the car ran better. When I plugged it back up it started running weird again. I replaced this sensor and drove the car around about an hour, ran beautiful. All of a sudden, I'm at a light and it cuts off again. Now I have to drive with two feet to keep it running because when I stop it just dies out. IT hasnt set any different codes, same code P102. When it acts like this it wont start unless i give it gas. If i just turn the ignition without giving it gas it doesnt start. After a few times of this it just turns over. If I let it sit for 2 minutes it starts up and runs fine, and then it will just shut down. Am I dealing with a MAF sensor issue or something else. I also didnt notice any vacuums hoses. Any help would be greatly appreciated.
#350 of 360 Re: Stalls while driving and runs rough [damionsr]
Feb 23, 2013 (8:08 am)
The first thing I would look at is the Mass Air Flow sensor. I replaced mine twice, you should be able to look up the code. P102 points to MAF. Make sure you get a good one, doesn't have to be GM but watch out for the remanufactured ones. First I got a remanufactured MAF within 2 weeks it started acting up, then I took it back and got a new one and it was fine after that. It takes 5 minutes to replace it, it is on top of the engine.
#351 of 360 99 GTP occasional stalls
Feb 26, 2013 (7:57 pm)
#352 of 360 99 GTP occasional stalls
Feb 26, 2013 (7:57 pm)
99 GTP cranks but will not start, next day starts. drove for 2 days. Again will not start, had been setting for 2 hrs so not hot. Started next day fine. Next day dies at 50 mph (daughter describes like running out of gas still idle but 0 rpm) restarts go a little farther same thing again, takes back to campus, ran fine. 2 days later drives 110 miles home, fine. 2 days later I drive 10 miles to work, started and ran fine. 2 hrs later crank, no start. Could hear fuel pump running. Left key on popped hood checked connections, then car starts. Did fine rest of week, ran to warning on fuel level, filled to 3/4 tank, changed fuel filter let run for 15 min. 2-3 hrs later crank but no start. checked at bleeder on inj. tube had fuel. got back in car, started fine. Next day fine. 110 miles back to school. Monday starts and runs fine for 20 miles set for 4 hrs starts fine then stalls at 50mph a few miles up road, daughter tries to start several time, crank no start, told her to leave key on a couple min. starts and runs fine. Next day 110 miles back home fine. Help, I'm going nuts!
#353 of 360 Re: Stalls while driving and runs rough [pontiaclives]
Mar 04, 2013 (9:47 pm)
Ok, now I'm frustrated. Took the car to a reputable GM dealer and they told me the MAF sensor plug was bad. Couldn't tell if the MAF was bad until we replaced the plug. Replaced the MAF sensor and plug, IAC. Take the car from the dealership, drive it and within the hour it's stalling again. only code it ever sets is 101. What it does is it can be running just fine, i come of the accelerator and the rpms drop to 500 and it's like the car is surging, the rpms are fluctuating as the car is fighting to keep running, give it a little gas and its fine. other times when you come off the gas the car dies instantly and it wont fire up unless you are giving it a little gas. the dealership cant seem to figure it out, fuel put is putting out a consistent 42 psi. another thing i notice is the boost for the supercharger is increasing when it should be. sometimes sitting at idle it flashes a couple of notches. i'm totally lost on this car!!