Question about 1999 Pontiac Grand Prix

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99 grandprix 3.8L wont shift until 4K rpms periodicaly stalls

One day when i was driving my car the shifting became earatic, slipping and the tach was going high and low.it all seemed to have started when i started my car oneday the idle kicked up to 3000 and i couldn't get it to go down.now the car wont shift until it hits 4000rpms and it dies when ever it wants could someone please help i seem to be having one problem after the other, car has 99K miles

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Posted on Jan 02, 2017

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  • 599 Answers

SOURCE: 86 Grandprix it shifts gears to fast andI get no torque

get it scanned for soft codes.... likely a VSS (vehicle speed sensor) out or shift solenoids for trans

Posted on Dec 23, 2008

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  • 6 Answers

SOURCE: gears slipping

Either try changing your timming chain or it could be crank censor.

Posted on May 19, 2009

  • 169 Answers

SOURCE: 2003 pontiac slips on 2-3 shift and does not down shift all the

who ever rebuilt trns missed something poss pcs solenoid, seals leak in input housing,seals or support housing leak,worn valvle in valve body, did he clear shift adapts, did he check for codes, did he do a press check, did he flush cooler nice trns overhaul good thing you got a warranty on job

Posted on Aug 30, 2009

co7196
  • 3433 Answers

SOURCE: my 99 GA GT. when i put it in drive it feels like

ck your fluid level, you may be diue foer change.

Posted on Oct 14, 2009

wracefans24
  • 1985 Answers

SOURCE: tranny causes engine to stall when tranny warms up

if it feels like your driving a standard transmission ,and "you came to a stop light without pushing clutch in"
that will be the torque convertor lock up,

Posted on Jan 12, 2010

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1 Answer

I have a 2002 Celica GT 5-Speed and I shift at about 4k RPMs when getting on the highway and I still feel I'm accelerating to slow. Am i doing something wrong?


Not driving a corvette? Just kidding. More details are important. How slow is your acceleration? Is it 0-60 in 8 seconds, or 20 seconds? What is redline on your car? If redline is 5K then 4000 is a good responsible shift point. If redline is 8K then shifting at 4000 is probably robbing your engine of it's torque and horsepower band. I believe the GTS model has an 8K RPM redline, the GT may be lower, but in that case, shifting at 4K is too soon for strong acceleration. Your Tachometer should have redline clearly marked. For responsible use, stay below that, maybe 10-20%. For economy stay further still, but for power you need to let the engine use it's RPMS, especially smaller and fewer cylinder engines usually don't make their power until they are half way through the RPM range and above.

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I agree. It sounds like you are not going into overdrive or lockup.

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not shifting into drive......how you going 60mph? downhill with the wind behind you?

You put it in drive and its "not shifting into drive" what happens then? If it doesn't shift into drive, you're not moving. If you're moving, You can feel it shift. The rpms change. keep track.

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1 Answer

2003 pontiac slips on 2-3 shift and does not down shift all the


who ever rebuilt trns missed something poss pcs solenoid, seals leak in input housing,seals or support housing leak,worn valvle in valve body, did he clear shift adapts, did he check for codes, did he do a press check, did he flush cooler nice trns overhaul good thing you got a warranty on job

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When you first start driving it usually takes atleast 4 miles to warm the transmission to operating temperature. The temp of the motor may say it is warmed up, But, the trans fluid and differential fluid only begins to warm as you drive and the parts are actually working. THe computer has sensors that keep the trans from shifting to OD until the temp is up as not to add stress to the motor until warmed properly. Hope this helps and have a good day.

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Could my transmission be slipping


Quick check is to accellerate from a stop with steady even pressure on the gas. Watch the tach. It should have a good shift at approximately 2000 rpm and the tach should not jump higher during the actual shift (called flairing) This should be the same for each shift. Converter lockup (4th gear shift) should cause tach to drop about 500rpm and should happen at about 45mph. Then repeat the same process using a more agressive acceleration.
Shift points in rpms may be a bit higher but each shift should not flair. To check lockup, while driving at about 50mph, lightly touch brake pedal and you should feel ti disengage for a moment. Since you have an opportunity to return it, It would not be a bad idea to get a hands on evaluation from another shop you trust...I can't see it from here and a live person is better equipped to give an informed opinion.

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1 Answer

86 Grandprix it shifts gears to fast andI get no torque


get it scanned for soft codes.... likely a VSS (vehicle speed sensor) out or shift solenoids for trans

Dec 23, 2008 | 1986 Pontiac Grand Prix

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