Last post on Aug 22, 2013 at 12:43 PM
You are in the Pontiac Grand Prix
What is this discussion about?
Pontiac Grand Prix, Transmission, Sedan
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#59 of 498 Re: 1997 Pontiac Grand Prix [nathan211]
Dec 28, 2006 (8:23 pm)
No problem. I figured out what was wrong. While rotating the tires today I checked all four speed sensons that are attached to the wheel hub assembly. On the front driver side the wire that comes from the hub assembly to the connector split because it somehow disloged from the metal bracket. Two options to fix. One is to replace the wheel hub assembly, quite costly and timely, or attempt to soder the wire. I am going to try optoin two.
#60 of 498 Re: 1999 Grand Prix GT Transmission/Jerking Problems [montana_cat]
Dec 29, 2006 (12:51 pm)
Add my car to the list too. It has exactly the symptoms of msg #51. It is a 2000 with 100K miles. My garage has changed the pressure solenoid (twice), the torque converter (temporary improvement), and this week after the transmission stopped working totally they changed the transmission. Put in a used one with 36K miles. Pressure solenoid and torque converter kept as they were recently new. There is improvement but still has the symptoms occasionally. Has anyone found a solution to this problem???
#61 of 498 Making a slight bit of headway
Dec 31, 2006 (4:01 pm)
In reply to message #60 (and others), this is the poster of message #51.
My car has been to the dealership twice more since my last post. In trip #9 (in three months), they had it for two days checking everything over and cleaned the fuel injectors. There was some improvement, but my car still surges on some hills.
I called the service manager, and he said they would do it again (trip #10 in three months). So, they did it again, keeping it two more days - leaving the injector cleaner in overnight and changing the fuel injector regulator(?).
I got the same results, a little more improvement, but still no solution. The service manager has been on vacation this past week, but I am calling him Tuesday morning.
On the positive side, my gas mileage has improved by 3-4 mpg, and my car doesn't feel like it is trying to pull a dead elephant up a hill, but it still has fits.
This is as annoying as all get-out. I love my car, but I have been considering trading it in more and more.
#62 of 498 Threw in the towel - Surging and loss of power
Dec 31, 2006 (5:10 pm)
This is an update on my two earlier posts. I just traded my 2000 Grand Prix GT primarily because of the problem with surging & loss of power. This would only occur when the engine was warmed up. I attribute the problem to the warped plenum (plastic intake manifold) that the dealer wanted to fix for big bucks. The plastic gaskets and intake manifold seems to leak on all of the 3800 series engines at about the 75,000 mile range. I also had a problem with the Tachometer dropping to zero and the “Track Off” light turning on from time to time. This would only happen when the engine was hot and then more frequently on very hot days. Sometimes the engine would stall. When restarted, the tack would work again and the “Track Off” light would go back off. One final irritating item was that water would leak on to the floor of the passenger floor area whenever it rained hard. Given that I have all my work done at the GM dealer, I knew this was going to cost me thousands. And who knows what is next? The transmission? So, I traded it in on a new vehicle. I did not get much for it in trade but I could not sell it privately given all the problems. Hopefully whoever does eventually buy it will be more mechanically inclined than I am and will be able to fix it without too much expense.
#63 of 498 Grand Prix GT Transmission/Jerking Problems
Jan 08, 2007 (1:56 am)
Ref msg 51
I have a 1997 GT with 342k miles.
I had the same problem. I had my PMC software updated $75 at the dealer.
The old software in the PMS was disengaging the lockup in the torque converter late.
The PMC update was a fix.
(Note) Most trans only lockup in 4 gear, ours can lockup in 3 & 4 gear, which is why it may jerk at different speeds.
#64 of 498 Re: Grand Prix GT Transmission/Jerking Problems [rob1997]
Jan 09, 2007 (6:55 pm)
To rob1997 (msg. 63)
This is the poster of msg. 51 and a few others after.
Thank you for posting that information. My car is going to the garage again tomorrow. I printed your post off and will give them that. Everything I see on here that might be a possiblity gets taken to them.
It is really awesome that you have gotten 342K miles out of your car. At this point, I think mine will be lucky to make 100K.
#65 of 498 Re: Grand Prix GT Transmission/Jerking Problems [montana_cat]
Jan 13, 2007 (9:52 pm)
I have the same issue as in msg.51 did updating the software as described in msg 63 fix you issue montana_cat?
#66 of 498 Gear shifting problem
Jan 14, 2007 (1:28 pm)
Problem w/ my 91 SE - trouble shifting out of park. I can physically move the lever to drive or reverse but the engine just revs like it's in park/neutral. Can sometimes manage to get it going by giving it a lot of gas... Once it's on the road it shifts smoothly, no problems at all.
#67 of 498 Re: Grand Prix GT Transmission/Jerking Problems [iahawks1]
Jan 16, 2007 (8:30 pm)
Yes, I do believe the problem is FINALLY solved.
Thank you rob1997!!!! You don't know how happy I am right now!
As far as details, the dealership said my car had the "latest" software installed on it, but after reading rob1997's post the service manager called GM. GM gave him brand new software that had not been released yet (as of Wednesday, Jan. 10). SO, iahawks1, I would make sure they contact GM for the newest software, or you may still have the same problem.
When I accelerate, the tach no longer tries to stick and surge around the 2K mark. I didn't post an update any sooner, because I had a nice long drive tonight with lots of hills and I figured that would be the ultimate test. And my car passed!!! Yay! I've been dealing with this problem for six months, so it is almost unreal that it is resolved now.
rob1997, what is the PMC and PMS? I'm not that car smart. And is this why I've had transmission problems at 30K and 60K ... bad computer software??? I sure hope the new software will be the end of my transmission problems.
#68 of 498 will it work on my 98
Jan 22, 2007 (2:19 pm)
I have a 1998 gtp with the same prob as you guys have and I was just at the dealership short of reading your last message so I printing it out and taking it tomorrow. Do you think the update will be for my car to if so you have the update code for the dealership?