why does the car have hard shifts through gears when accelerating and shutters sometimes?

215

Asked by Sep 21, 2012 at 05:34 PM about the 2002 Pontiac Grand Prix GT

Question type: Maintenance & Repair

At first when starting out it's smooth but when driving for a while it starts the above.

9 Answers

10,605

Have you checked the transmission fluid?

215

Hi Michael, Yes, I've had the car for 2 weeks now. The trans fluid was down 3 qrts so I brought it to the right level. Thanks.

10,605

I would look for leaks. There is no reason it should be that low if there is not a leak. Did it fix the issue after you topped off the fluid?

215

Hi Michael. No, Not any real improvement. I don't know why it was so low, Maybe the other owner was going to have something done? So I decided to take it to my mechanic. He did a flush, additive and cleaned/changed the filter etc. It seems a bit smoother. He told me there were no shavings in there. I guess the real question is what is it making this happen? Computer? Thanks.

765

Hi Pete.I had the identicle problem with mine.I had a '97 and one day the car was in for a ofl.We checked the tranny fluid and it was a dark gray colour.We did a service on it,and two weeks later,the fluid was gray again.I took it to a tranny shop,and the owner,who also teaches mechanics on GM vehicles told me these trannys are all bad like this.Bottom line the tranny was done.When I bought my '02 I decided to service the tranny at 120'000kms and add a Lucas to it.I pulled out of the shop,drove for about 10mins,and it started shifting hard.A friend of mine used to be a tech at a GM Dealership,and after scanning it found that one of the shift solenoids was gone.We replaced that,and the problem got worse.Now I had no first gear,so I took it to a tranny shop and it had to be rebuilt.The rebuild kits that they use are upgraded and should be problem free.I hope your situation is not as severe.Good luck.

1 of 1 people found this helpful.
215

Hi Riccardo, Now after that work was done on Sat. sometimes hard shifts and some no. I don't think the fluid was gray but I'm going to check in a couple of days. I think your right but it's just happening in a different way but the end is the same. Thanks.

765

Don't expect the fluid to be gray.Sometimes it will stay red and the shift solenoid will not perform as it should.It will not do it all the time,because everytime you turn off your car the computer resets itself,and since the tranny is computer controlled,it will reset that as well.

10,605

Not true Riccardo. If you have a solenoid go out. It just goes out.. I have had it happen many of times. Chances that the low fluid took out all of the solenoids is quite an impossibility. More than likely, the low fluid damaged the torque converter or the pump which is causing the problem.

215

Thanks guys, A lot to think about! After the car has been sitting (apparently) over night let's say, in the morning it will start shifting smoothly then after 10 minutes it starts hard but not always, some shifts are ok. Maybe a component is damaged as Michael mentioned? Haven't check fluid lately, maybe today. The fluid leak actually is a rack seal(rack & pinion)Ya me!

1 of 1 people found this helpful.

Your Answer

Grand Prix

Looking for a Used Grand Prix in your area?

CarGurus has 2,644 nationwide Grand Prix listings starting at $1,449.

ZIP:

Pontiac Grand Prix Experts

  • #1
    Js08016
    Reputation
    4,420
  • #2
    Tom Demyan
    Reputation
    3,050
  • #3
    munron
    Reputation
    2,470
View All

Related Models For Sale

Used Chevrolet Impala
535 Great Deals out of 35,140 listings starting at $900
Used Pontiac Bonneville
490 listings starting at $3,699
Used Chevrolet Monte Carlo
4 Great Deals out of 1,282 listings starting at $1,488
Used Ford Mustang
585 Great Deals out of 36,177 listings starting at $1,200
Used Pontiac Grand Am
1,090 listings starting at $994
Used Chevrolet Camaro
429 Great Deals out of 30,647 listings starting at $1,450
Used Chevrolet Malibu
943 Great Deals out of 65,134 listings starting at $1,995
Used Pontiac Firebird
5 Great Deals out of 769 listings starting at $2,500
Used Nissan Maxima
257 Great Deals out of 22,758 listings starting at $1,400

Used Cars For Sale

2007 Pontiac Grand Prix GT For Sale
3 Great Deals out of 64 listings starting at $2,400
2005 Pontiac Grand Prix GT For Sale
5 Great Deals out of 99 listings starting at $1,500

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.