Question about 2004 Pontiac Grand Prix

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My 2004 pontiac grand prix gt...is loosing power. When I am on the freeway it feels like it's sluggish and when i step on the gas sometimes it doesn't downshift. also every now and then the temp gauge seems to indicate overheating then it drops down...i check coolant and its okay. also the o2 sensor is bad and I haven't done a tuneup on the car...like spark plugs and wires. could all this contribute to the car running sluggish? Oh yeah and I also replaced the mufflers with performance mufflers.

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  • Pontiac Master
  • 3,199 Answers

Yes a bad 02 sensor will cause the car to run badly. and change those plugs too

Posted on May 24, 2017

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Posted on Jan 02, 2017

  • 15 Answers

SOURCE: 1992 Pontiac Grand PrixPower loss,erratic idle

im fixing what seems to be the same problem on my 92 grand prix try listening for a vacum leak when the engine is warm. my problem is the brake booster is leaking. when i come to a stop it almost stalls. i dont know if that will fix your problem but from my experience the grandprix's thats my guess. if im wrong look in the fuel injectors

Posted on Sep 30, 2009

  • 1 Answer

SOURCE: 1996 Pontiac Grand Am overheating

my 96 grand am keeps overheating after i have changed my thermostat and water pump

Posted on Oct 02, 2009

motor1258
  • 6674 Answers

SOURCE: spark plug gap for 2005 pontiac grand prix gt 3.8

.060 thousandths of an inch.

Posted on Nov 19, 2009

  • 1146 Answers

SOURCE: where is the coolant sensor located for a pontiac grand am gt

There are 2 coolant sensors, one to control the radiator fan, and one to tell your computer how hot the engine is. They are both mounted in the engine, not far from where the upper radiator hose attaches, and where your thermostat is.

Posted on Dec 01, 2009

  • 1 Answer

SOURCE: I have a pontiac grand prix gt 3800 non turbo is

look a round the injectors for wet or damp spots(bad seals)...my 3800 was sucking air around seals causing it to run rich and throw codes for misfires and 02 sensors

Posted on Mar 15, 2010

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