2000 PONTIAC GRAND AM MISFIRES ON 3 CYLINDERS

  • Tiny
  • treflip98
  • 2000 Pontiac Grand Am

Engine Mechanical problem
2000 Pontiac Grand Am 6 cyl Two Wheel Drive Automatic 172000 miles

I have a 2000 Pontiac Grand Am Se with 172,000 miles. It has a misfire on 3 cylinders. At idle it runs rough and low. As I accelerate more it seems to be much smoother. Also I get horrible gas mileage when it's supposed to get 20-32 mpg. I've replaced the plugs, wires, coils, and the ignition module. It also shows no signs of a leaking or blown head gasket. Could it be the fuel injectors or computer?

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Monday, July 6th, 2009 AT 2:37 AM

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  • Tiny
  • mmprince4000
  • Expert
  • 8,715 posts

Have PCM scanned at most autoparts stores for free.

Report any codes. Other sensors that are out of range will cause a rich mixture and misfires, coolant sensor for example.

You also could have a clogged CAT.

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Monday, July 6th, 2009 AT 8:27 AM

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