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Backfires after acceleration

2004 grand prix gt it seems to lag power I switched coils and plugs and wires nothing still sometimes while accelerating if I don't keep the gas pressed enough the car will **** and go to lower gear like it jumps back a gear or something? sometimes on acceleration car will shake shake for a second or 2 then go. also sometimes it wont go into the passing gear. the car has been like this sence I bought it so I don't know when it started or any detail like that.

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  • Jeff Turcotte
    Jeff Turcotte Jun 15, 2017

    Hi collin , I want to help you with your question, but I need more information from you. Can you please add details in the comment box? Check the map sensor. Is the engine light on?

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Posted on Jan 02, 2017

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SOURCE: Rough idle, Car shakes, sputters and misfires upon acceleration

It sounds like you may have a problem feeding the fuel to your engine, I had the same problem with my 89 RS. All the 1989 model's fuel systems were recalled. I think you may need a new fuel pump. The fuel pump is located inside the gas tank in the rear of the car right under the rear axle. The fuel pump itself isn't too expensive, but with other small parts such as the electrical harness upgrade and fuel filter and the labor you should be looking somewhere in the $500 range. I hope this helps.

Posted on Jan 12, 2009

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SOURCE: Shifts hard and jerks under hard acceleration.

thottle positioning sensor? if trans has overdrive could be a lock up piece, dont remember name of it. there is a lucas oil product that might help. if it is the overdrive.

Posted on Nov 06, 2009

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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

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SOURCE: 95 jeep wrangler splutters, jerks, backfires during acceleration

The ECU controls all of that. When they start to go bad they do very strange things that are hard to diagnose. They run about $300 bucks of you do it yourself. They are simple to do. Shop around because it is an electrical component and many places wont warranty them but some places do if your lucky you can find one. I also would not rule out your timing or distributor. I dont know you or what you have checked but could be the rotor or could be carbon tracking inside the distributor. Even the slightest crack in the cap can mess everthing up.

Posted on Jan 30, 2010

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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