Last post on Nov 23, 2013 at 4:09 AM
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Pontiac Grand Prix, Engine, Sedan
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#341 of 367 Re: 2007 Grand Prix won't start [furnaceman100]
Nov 14, 2012 (7:39 am)
Check signals from Ignition Control module to the Powertrain Control Module ( there are four signals two for Crank Position Sensor and 2 for Cam Shaft Position Sensor) Pin to pin tests are need to resolve this issue not a scan diagnostic tool. If you have the four signals going into the Powertrain Control Module (PCM) also reffered to as the Engine Control Module (ECM) the checking of the signals should be done when the car is in the state of cutting off when warm and not starting. If the four signals are not coming out of the Ignition Control Module (ICM) then check the two signals from the Crank Position Sensor (CPS) and Camshaft Position Sensor (CAMPS) going into the Ignition Control Module (ICM). The two sensors are located behind the crank shaft pulley Harmonic Balancer. If one of the signals are not coming into the ICM then you will not have a spark. If everything checks out as above then you would need to check the ignition control signal from the Powertrain Control Module (PCM) back to the Ignition Control Module (ICM) this is the signal that tells the coils to fire on top of the Ignition Control Module (ICM).
I had the same issue with my 2007 Grand Prix and did all the pin to pin test to find out what the problem and root cause for me was the Crank Position Sensor (CPS) no signal from the CPS at all.
I first took the advice from what was done by other posters from other websites and changed the ICM with a aftermarket ICM (DURALAST) and that caused more issues because it would contantly over heat and cause the car to cutoff. The duralast ICM for these cars are not up to OEM Specs even though they say it is OEM Specs.
I replaced the CPS after the first Duralast ICM and put another duralast ICM on the car and car would cutoff and the duralast ICM would be super hot. Then I put back my origin GM ICM back in the car and have not had a problem with the car getting and cutting off.
You would not get any codes for a CPS or ICM being bad all other parts ie. MAF, MAP, IAF, EGR, Fuel Pump, Injectors, and O2 sensors will throw out codes. The Crank Position Sensor and Camshaft Position Sensor are the weak points in this Ignitions systems because of the nature and where they located in the engine block heat will cause these parts to fail in time and will cause car to cutoff when hot and not start again until cooled off. Fuel pumps will plain quit working and never start working again. You need fire and gas for a car to start. No gas pressure at fuel rail no start, No fire from Coils no start.
#342 of 367 Issue with my 2006 Grand Prix not starting in the cold
Dec 31, 2012 (5:01 pm)
My 06 Grand Prix doesnt wanna start in the cold this year. I have checked the battery while it is running, and the battery is right around 14 volts. I have had an issue with one of the modules that controlled the headlights burning out, and having to be replaced. On the first attempt, I am not hearing anything out of the starter, but on the second try it clicks and starts up on me. When the car starts though, the date and time have all been reset. Any ideas on what this issue might be?
#343 of 367 Re: Issue with my 2006 Grand Prix not starting in the cold [kashell]
Jan 02, 2013 (8:49 am)
Let us know if you were going to get this checked into at the dealership. We certainly understand if you were looking into different options as you're outside of warranties at this point, but just wanted to offer to follow up on any dealer visits you may make.
All the best,
GM Customer Service
#344 of 367 STARTING ISSUES...I'M LOST PLEASE HELP!
Jan 09, 2013 (4:32 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 (8:49 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 367 Re: starting issues [pontiaclives]
Jan 09, 2013 (11:29 pm)
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 367 Re: some time it wont start [prettyb]
Jan 12, 2013 (7:39 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 367 Re: some time it wont start [jenb2011]
Jan 12, 2013 (8:53 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 367 Stalls while driving and runs rough
Feb 22, 2013 (10:23 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 367 Re: Stalls while driving and runs rough [damionsr]
Feb 23, 2013 (7:08 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.