1998 Pontiac Grand AM GT motor revs

Hello James,

If the engine revs up with no increase in speed, your clutch is slipping. Probably the reason the car was sold!

Alan.

Motor & Transaxle Mounts --- may be the issue
If so--- replace them--- all
Put your foot on the brake & put into fwd & rev, while
someone looks under the hood at the motor movement
Have them off to the side & torque the motor some against
the brake
Also check cv axle joints--- once the mounts are taken care of

It's called Bad Transmission, it's slipping...either low on fluid or Burnt, time to replace it or rebuild it

The throttle body can be sticking. Also you could have a broken throttle position sensor. Vacuum leak, near the rear of the intake can cause increased RPM's. Check around under the hood for loose connections, I always start there.

Have the idle/air control valve checked, the pintal inside could be stuck or just needs cleaning.

I had the same problem with a 2.2 it was the catalytic converter being glogged had to be replaced

since it sounds like this happens infrequently, you may want to check for something binding the accelerator pedal. ( wouldn't that be great if its that simple?) one can only hope...

likely what you are seeing is the first signs of slipping. If permitted to continue, likely it will get worse and you will then lose a bit of speed when it happens. In warmer weather the trans runs a bit hotter and will react to that. If you cannot hear the revs increasing but the tach says they are, it's also possible that for some reason the tach isn't reading correctly. Any good tech should be able to tell the difference. Problem I have is that I'm here and can't drive it to give you a "definite" on either.The only way to verify this yourself would be to attach an external tach to the engine and compare the rpms of the one in your dash to that one.

I think this may be an auto up that is used to increase the revs when the air/con is turned on.It may not be! but it's worth a look.What it does is increase the revs on the motor when the air is switched on, to stop the motor stalling.It works by vacuum and is run by a thing that is about 2 inches across,reasonably flat and has a small hose hooked to it.If the hose is leaking it will increase the revs.This may not be the problem,but start there and I hope you find this helpful.

yes there are companies that sell chips for computer to change the rev limit,trans shist points, top speed govenor.