• Tiny
  • Kbullman1963
  • 1997 Pontiac Grand Am
  • 13,600 miles

2.4L was misfiring. Codes for misfire, O2 and lean bank. Replaced plugs, coils, CPS, had ICM tested - ok. Did spark test- no spark. Battery charged. Checked incoming harness to ICM. I did get 1 volt between purple and yellow. Seem to have no voltage while cranking on the two wires carrying a/c voltage.

Wednesday, September 14th, 2011 AT 2:34 AM

1 Answer

  • Tiny
  • rasmataz
  • Member

Lean fuel condition could be caused by one of the following below: 1. Vacuum leaks
2. EGR and PCV valve.
3. Low fuel pressure.
4. Dirty fuel injectors.
5. Mass Air Flow Sensor.
6. Oxygen Sensor.

No spark: No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, coil's resistances, cap and rotor, distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it and keep testing

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Wednesday, September 14th, 2011 AT 2:53 AM

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