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1999 Pontiac Grand Am 1999 Grand Am Misfiring

Tiny
TWISTEDSAINT999
  • MEMBER
  • 1999 PONTIAC GRAND AM
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 123,000 MILES
I have a 2.4L quad-4 engine that has a misfire in one of the cylinders and carbon buildup in the throttle body. I ran a can of Seafoam through the intake and one through the oil to clean everything out. I checked the compression and it has 125lbs after 5 cranks and all cylinders are static. I replaced the ICM, both coil packs and the spark plugs. The only thing I can think of now is the EGR valve but I don't want to spend $100 if I don't have too. What is wrong with my car?
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Friday, November 13th, 2009 AT 6:10 PM

1 Reply

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
Use a noid light to check the injectors are firing.

The EGR would (generally) not cause a single misfire, EGR flow at idle or low speed would cause stumbling and multiple misfires.
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Saturday, November 14th, 2009 AT 9:04 AM

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