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

135

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

10,125

Have you checked the transmission fluid?

135

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.

10,125

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?

135

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.

685

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 out of 1 people think this is helpful.
135

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.

685

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.

10,125

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.

135

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 out of 1 people think this is helpful.

Your Answer

Add photo

Related Questions

Grand Prix

Looking for a Used Grand Prix in your area?

CarGurus has 2,869 nationwide Grand Prix listings starting at $1,500.

ZIP:

Search Pontiac Grand Prix Questions

Pontiac Grand Prix Experts

#1 Js08016
Js08016
Reputation 4,160
#2 Tom Demyan
Tom Demyan
Reputation 2,830
#3 munron
munron
Reputation 2,180
View All

Related Models For Sale

Used Chevrolet Impala
587 Great Deals out of 31,590 listings starting at $799
Used Pontiac Bonneville
3 Great Deals out of 536 listings starting at $1,799
Used Chevrolet Monte Carlo
20 Great Deals out of 1,393 listings starting at $1,995
Used Pontiac Grand Am
1,222 listings starting at $1,999
Used Ford Mustang
458 Great Deals out of 45,660 listings starting at $1,999
Used Chevrolet Malibu
915 Great Deals out of 79,618 listings starting at $1,500
Used Chevrolet Camaro
214 Great Deals out of 30,774 listings starting at $1,217
Used Honda Accord
830 Great Deals out of 85,682 listings starting at $988
Used Pontiac Firebird
10 Great Deals out of 732 listings starting at $3,875

Used Cars For Sale

2007 Pontiac Grand Prix GT For Sale
3 Great Deals out of 80 listings starting at $2,500
2006 Pontiac Grand Prix GT For Sale
81 listings starting at $2,675
2005 Pontiac Grand Prix GT For Sale
4 Great Deals out of 112 listings starting at $1,895

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.