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Pontiac Grand Prix Starting / Stalling Issues

360 messages,  Last post on May 15, 2013 at 6:16 PM

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What is this discussion about? Pontiac Grand Prix, Engine, Sedan

    
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Messages Page 35 of 37

#339 of 360 Re: 2007 Grand Prix won't start [lisa121] by edwardk756

Nov 14, 2012 (8:01 am)

Replying to: lisa121 (Sep 05, 2012 10:52 pm)
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.

#340 of 360 Re: 2007 Grand Prix won't start [darlaj] by edwardk756

Nov 14, 2012 (8:28 am)

Replying to: darlaj (Apr 30, 2012 1:26 pm)
If the Computer System Failure is popping up the only it could be the the Powertrain Control Module or also called the Engine Control Module which is located in the Air Filter Housing.

#341 of 360 Re: 2007 Grand Prix won't start [furnaceman100] by edwardk756

Nov 14, 2012 (8:39 am)

Replying to: furnaceman100 (Sep 06, 2012 4:19 pm)
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 360 Issue with my 2006 Grand Prix not starting in the cold by kashell

Dec 31, 2012 (6:01 pm)

Replying to: edwardk756 (Nov 14, 2012 8:39 am)
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 360 Re: Issue with my 2006 Grand Prix not starting in the cold [kashell] by gmcustsvc

Jan 02, 2013 (9:49 am)

Replying to: kashell (Dec 31, 2012 6:01 pm)
kashell,
 
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,
Sarah
GM Customer Service

#344 of 360 STARTING ISSUES...I'M LOST PLEASE HELP! by cosully777

Jan 09, 2013 (5:32 pm)

Hi all,
 
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.

#345 of 360 starting issues by pontiaclives

Jan 09, 2013 (9:49 pm)

Hi cosully777,
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] by cosully777

Jan 10, 2013 (12:29 am)

Replying to: pontiaclives (Jan 09, 2013 9:49 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 360 Re: some time it wont start [prettyb] by jenb2011

Jan 12, 2013 (8:39 pm)

Replying to: prettyb (Jul 25, 2012 2:16 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] by cosully777

Jan 12, 2013 (9:53 pm)

Replying to: jenb2011 (Jan 12, 2013 8:39 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.

Messages Page 35 of 37

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