Question about 2006 Pontiac Grand Prix

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My 2004 Pontiac Grand prix stalls when accelerating to 45mph and

When I get to 45mph the car starts to whine and stall out, I can accelerate it past 45 but it takes some time, a slow start and the noise does not go away until I decelarate down to 30mph or less. Took it to a shop and they stated that the CAT was caput and the supercharger is too, both totally clogged and the price to fix runs about 4,000 dollars but I don't understand how this can happen so suddenly and I get it serviced routinely.

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5 Suggested Answers

  • 48 Answers

SOURCE: the car will not accelerate;

this sounds like 1 of 2 possible problems.
a bad headgasket or a clogged catalytic convertor. i would lean more towards the convertor

Posted on Jul 16, 2008

  • 1 Answer

SOURCE: My 2004 Pontiac Grand Prix barely moves!!!!

Have you ever had the catalytic converter changed. Over time the pellets inside will melt together and this will make the care very very sluggish like it does not want to run. You may want to try that.

Posted on Jul 06, 2009

  • 1201 Answers

SOURCE: p0102 Grand Prix

P0102 is ---- mass or volume air flow circuit, low input.
Check the wires going to the maf sensor and at the connection. If all seems ok, you might need a new sensor, seeing how it ran a little better when disconnected.

Posted on Jul 15, 2009

  • 84 Answers

SOURCE: I have a 2004 grand prix gt and sometimes on start it stalls

Take your car to a dealer and tell them to "clean the throttle body" Known problem for this year. It will solve your issue.

Posted on Dec 30, 2009

Molson02536
  • 3854 Answers

SOURCE: Pontiac Grand Prix GT grinding and whining noise when turning...

If you have a warranty from your dealer, you paid for it, or whether it came with it, it doesn't matter, you MAKE them honor it. Take it back there, and MAKE THEM FIX IT! This shouldn't be your problem if you have a warranty. If they aren't honoring it, threaten them with the BBB or court. They will shape up.
I would say power steering pump.First check to make sure there is fluid in the reserve tank and at the proper level if not top it off and whine should stop.If level is correct then maybe try flushing with fresh fluid.
3.8L engine the power steering fluid was never toped/checked.. because it is a pain in the *** to get at (behind the hot as hell alternator), so it probably ran dry, top it up is probably all you have to do.. if the whining presists then you will have to try and bleed the air out by jacking it up, engine off, turn the wheel one side to the other about 25 times.. if that dont quiet it up then you will have to replace the power steering pump.


Power steering pump / fluid level is not hard to check - it is located below the alternator on the passenger side of the engine bay. You need a light to see it. You can get your hand down from the top of the engine to loosen and remove the cap/dipstick.
Here is a link that should help you.http://www.paulstravelpictures.com/GM-Pontiac-Grand-Prix-GTP-Power-Steering-Whine/index.html
Good luck and thank you for using Fixya

Posted on Mar 09, 2010

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