Question about 2002 Pontiac Grand Prix

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It shifts slow and doesn't seem to have much power

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  • Pontiac Master
  • 454 Answers

Sounds like the catalytic converter is about ready to go bad. When the cat goes bad the car struggles to start, then when you try to acelerate its very slow. Start your car and have a friend rev the engine. Put your hand close to the tailpipe. I am willing to bet that not much pressure comes out when engine is reved up. I had mine replaced about a year ago. This sounds exactly like the same problem I had. The local pontioac dealer changed mine out for free. Check back I am interested in the results.

Posted on Dec 22, 2009

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Posted on Jan 02, 2017

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sounds like normal behavior

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6cyl,1994 toyota camry shuts off when shifted, but when car stays on it doesn't go with full power and over heats an shuts off. takes a couple of startups to get to stay one when its cold it shift


your catalytic converter may be clogged, if it is bolted on loosen the bolts and pry it away then try to start. if the power returns then you need to replace the catalytic converter. also is it an automatic or standard transmission? If automatic the torque converter is stalling at to low of rpm and needs to be replaced.

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Engine dies at stop lights when air conditioning is in use


Lets use common sense on the Trans Flushing

Old Fluid out --- New Fluid in---WOULD THAT DO ANYTHING
TO CORRECT ANY PROBLEM------NO

Trans & Power Steering Fluids-- are done every 3 years
in my world
They are called Preventative Maintenance,just like spark plugs,
gas & air filters,nothing else,fixes nothing

Trans fluid breaks down over time from heat & then your
clutches burn up & your trans fails,no other reason to change
the fluid

If the Torque Converter Clutch Solenoid is bad & doesn't
release when you apply the brake,then it is like slowing down
with a standard shift car & not putting in the clutch when you
come to a stop

You need to ask more questions & understand what your
told or stay in the conversation & take it into the service bay
& not deal with a service writer who doesn't work on the
product.

Jul 24, 2012 | 2011 Kia Sorento

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Transmission shifts hard


I would stop using it immediately

Any trans issues, is like you having a heart attack

You drive 5 miles one time & you could be out
$3000.00 ,in a heart beat

Assuming the Tach doesn't flair, indicating slipping,
you diagnose any driveability issues with the engine ,
that effect shift strategy,then move on to the transaxle
diagnoses

If it slips already your done,it has to come out

Jun 05, 2012 | 2005 Suzuki Verona EX

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I have a Audi a4 and it doesn't shift at all what could it be?


it sounds like the gears are stripped inside the transmission. check the fluid level, not sure but it may have a sensor which wont allow it to function with low fluid levels.

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I have a 1994 gmc yukon and im having trans issues just changed the trans pan and seal thinking dirty fluid. Well it manual shift 1-2 than over drive than it seems its over idling and like im in...


you are right to think it is a sensor. trash can get into the shift solenoids and make a trans act funny. you could drop the pan and replace the solenoids located in the back of the valve body.

Jul 16, 2011 | GMC Yukon Cars & Trucks

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Engine doesn't seem to be putting out the same power it used to. when i push on the accelerator, the engine revs up but lacks the acceleration speed it normally has. i'm familiar with transmissions...


Even though the transmission is shifting like it normally does, the torque converter may not be locking like it should be. That would give the feeling of the engine being normal but the acceleration not being 'solid'. If the engine seems to be running normally, the problem is likely the torque converter.

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My 1995 Ford Explorer overdrive light is flashing but the transmissions seems to shift sometimes but not all the time. Sometimes the light does not start flashing until I am slowing down and it begins to...


Start with simply changing filter and fluid for transmission. If that doesn,t work go to your local parts place and scan the codes on your vehicle. I have the same problem and that is what I am doing.

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1 Answer

Car dragging when shifted


you have a worned out clutch pads and it needs replacing, this also include the pressure plate from which clutch pads are pressed to achieve transfer of power from engine to your tires.

Nov 24, 2008 | 1999 Saab 9-5

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