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1993 Chevy Lumina No spark cylinder 4

Tiny
BOARDFREAK13
  • MEMBER
  • 1993 CHEVROLET LUMINA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 143,000 MILES
I recently moved from 6000 feet elevation to sea level. My car ran fine for about two weeks, then suddenly lost power. I tested for spark on cylinders 2, 4, and 6 (the front three), and discovered there was no spark on cylinder 4. I swapped the plug and wire with no effect, so I replaced that coil. My next guess is the Ignition Control Module. Is there any way to test it before I replace it? Any other suggestions?
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Friday, September 26th, 2008 AT 2:34 PM

1 Reply

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,549 POSTS
Check compression on cylinder #4. If none or low, you may have a headgasket problem, broken/bent pushrod/collapsed lifter.

Generally the ign. Module will affect all cylinders not just one.

When you relocate to sea level it is also a good idea to disconnect the neg. Battery cable for a minute. This will let the ECM learn the new air pressure and richen up the fuel mixture.
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Friday, October 3rd, 2008 AT 7:25 AM

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