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1995 Pontiac Grand Am Engine miss firing

Tiny
MOTORPOOL
  • MEMBER
  • 1995 PONTIAC GRAND AM
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 68,000 MILES
I have a 1995 Grand Am with a 2.3 litter engine. I need help with the following problem. The engine has a miss. Here what I have done so far. I ran a compression test on each cylinder and they read at 180 lbs. I have changed out the following parts. Spark plugs, coil packs, coil pack housing, spark plug to coil pack boots. All 4 injector are getting power. I ran diagnostic on the car. The only problem is that the car is running rich. Please let me know what else I should do. Thank you, Rory
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Tuesday, June 10th, 2008 AT 3:09 PM

4 Replies

Tiny
LEGITIMATE007
  • MECHANIC
  • 5,121 POSTS
Check fuel pressure.(Regulator) and oxygen sensor. Check all vacuum hoses and manifold for leaks, and idle air control valve
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Tuesday, June 10th, 2008 AT 3:24 PM
Tiny
MOTORPOOL
  • MEMBER
  • 2 POSTS
What do I need to test the fuel regulator?
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Tuesday, June 10th, 2008 AT 3:46 PM
Tiny
LEGITIMATE007
  • MECHANIC
  • 5,121 POSTS
https://www.2carpros.com/car_repair_video/test_fuel_injection_pressure.htm

check this out for fuel pressure reg.
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Tuesday, June 10th, 2008 AT 3:49 PM
Tiny
LEGITIMATE007
  • MECHANIC
  • 5,121 POSTS
And go here to check for spark:

https://www.2carpros.com/car_repair_video/test_engine_ignition_system.htm
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Tuesday, June 10th, 2008 AT 3:50 PM

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