grand prix gtp

  1. C

    Rear right passenger window/door leak.

    Hey there, my first post on this forum! I have a 1997 Pontiac Grand Prix GTP sedan with a rather terrible leak behind the passenger seat. Can’t get it to leak myself using a hose or bucket of water but after a heavy rainfall the footwell of the rear right seat will be flooded gross. Not sure...
  2. urielymc19

    Reduced engine power BY MAF senssor

    I have a detail in a 2005 pontiac grand prix with the gm 3800 series III. I discovered that the MAF sensor connector is broken, and when I turned on the car it turned on but indicated: "reduced engine power", I turned off the engine and when I turned it on again it marked "reduced engine power"...
  3. HeartNoise

    Bad Transmission or just the solenoid? | 2003 Pontiac Grand Prix GTP 3.8L V6 (Supercharged)

    When I bought the car around 6 months ago (204k miles) it had an occasional hard/delayed shift into first gear when I’d take off at traffic lights from a complete stop and then it started slipping a few weeks ago and as of last night it’s pretty much stuck in neutral. There has been no...
  4. T

    99 GTP issues

    1999 GrandPrix GTP issue. I have a 99 GTP that when cruising at 70 mph rpms are around 3k where as in my 03 rpms are like 2100 rpms. When letting off the gas in the 99 while cruising, rpms will fall to idle, and when gas is reapplied they Rev back up and, idk how else to explain it but, it feel...
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