Thread: 04 GP Stalling Problem

The ground wire? Theres a little small ground wire that I bolted under the coil pack assembly or whatever you call it if thats what you mean. How would I test a coil pack?

Yes I bolted that to the side of the head. I'll have to google it and see if I can do it this weekend.

BUMP

So I kind of narrowed it down some. Hoping to get some input. If i disconnect the battery for a while, the problem will go away while it's in the relearn stage but when it goes back to normal, the problem will start again. That worked for like a full day when the weather was warmer but when it got cold again, the problem came back and even if I disconnected the battery, it still did it. I'm thinking maybe it could be a combination of the TAC in the TB and crank sensor?

Update guys. I took it to the dealership to get diagnosed and it turned out to be the MAP sensor. When I replaced mine a couple of months ago, I was cheap and bought an oreillys part instead of oem and this was the result of that. Went to napa, paid them about $90 and installed it myself and now it runs like before. Problem solved!

Originally Posted by luckyg817

Update guys. I took it to the dealership to get diagnosed and it turned out to be the MAP sensor. When I replaced mine a couple of months ago, I was cheap and bought an oreillys part instead of oem and this was the result of that. Went to napa, paid them about $90 and installed it myself and now it runs like before. Problem solved!

Hey what code did you get for the map sensor? I am getting a map sensor code on my 08 model but I am not having any problems though

It wasn't throwing any codes. That's why I couldn't figure it out.

Originally Posted by luckyg817

It wasn't throwing any codes. That's why I couldn't figure it out.

Oh ok I see. My car is having a similar problem as yours but not as bad. Mine stalls out a little only if I try to floor it but it never cuts off. I checked the MAP sensor and it tested good. I am inclined to believe that its my Catalytic converter because I can hear a loud rattling noise coming from it. Also I am getting a P0406 code along with a MAP sensor code.

How do you know the MAP sensor is still good? Have you tried changing out the PCV that goes underneath the MAP sensor housing?

Oh and btw, my car started off wanting to stall but never shut off completely. This video was the progression from that.

Originally Posted by luckyg817

How do you know the MAP sensor is still good? Have you tried changing out the PCV that goes underneath the MAP sensor housing?

I checked the map sensor with a volt meter. I checked 5 volts coming to sensor from pcm when car was turned off. Then I checked voltage again with car running and it dropped down to 1.5 volts this indicates that the map sensor is good. I found a video on you tube that shows you how to check it.

Watch "Map Sensor Testing" on YouTube
Map Sensor Testing: http://youtu.be/B8EVhFc5Yqw

Originally Posted by luckyg817

Have you tried changing out the PCV that goes underneath the MAP sensor housing?

No I haven't even thought about the pcv valve. Will it cause hesitation or stalling?

No it wouldn't. I was just asking if you had changed it out since you were already in there. It's a cheap part. How is your oil? Milky any?

Did you check to see what the voltage for MAP is supposed to be vs what you got?

Originally Posted by Below Average Joe

Is your TB clean?

Yep. TB is clean. My car only has 50,000 miles in it. Which is why I dont understand why I am having this problem.
GM really needs to do a better job at investing in better quality parts on their vehicles.

Originally Posted by luckyg817

Did you check to see what the voltage for MAP is supposed to be vs what you got?

I checked the map sensor with a volt meter. I checked 5 volts coming to sensor from pcm when car was turned off. Then I checked voltage again with car running and it dropped down to 1.5 volts this indicates that the map sensor is good. I found a video on you tube that shows you how to check it.

Watch "Map Sensor Testing" on YouTube
Map Sensor Testing:*http://youtu.be/B8EVhFc5Yqw

Originally Posted by luckyg817

No it wouldn't. I was just asking if you had changed it out since you were already in there. It's a cheap part. How is your oil? Milky any?

No my oil is nice and clear. No milky residue at all.

try cleaning the ignition control module contact points and the contacts on the plate that holds the ICM