94 Grand Am 2.3 quad-4 SOHC vin. Code 3 180000 miles

Tiny
DARREN SCHULER
  • MEMBER
  • ALL OTHER MAKES ALL OTHER MODELS
Running on 1&2, 3&4 not. Have checked injectors and replaced one that was not completly closing(#4), all injectors spraying. Checked spark (#3) weak plug had 125000 ohms resistance, replaced all. Coils between 5000 & 6000 ohms (1-4)(2-3), no short to cover. Multi spark not as bright as I think maybe it should be but all equal. No unusual noise, power steering pump turning, exhaust manifold 1&2 heats up, 3&4 doesn't (first clue) plugs 3&4 very little soot, cylinder end of plug housing/ground staying silver, little discolorization on electrode(2nd Clue). It doesn't seem to shake quite as bad but still scratching my head. Whats next?
Sunday, December 31st, 2006 AT 11:29 AM

4 Replies

Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
Ignition coil housing and boots are real common on this one.
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Sunday, December 31st, 2006 AT 5:46 PM
Tiny
DARREN SCHULER
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Just installed new coils and housing, no luck. Going to start over and recheck everything. More ideas? Is this the proper place to reply to suggestions?
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Sunday, December 31st, 2006 AT 6:29 PM
Tiny
SERVICE WRITER
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Maybe check compression in the bad cylinders. Did you replace the boots for the plugs?
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Sunday, December 31st, 2006 AT 11:45 PM
Tiny
MATHIASO
  • MECHANIC
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What is wrong with the car?
Please explain.
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Monday, January 1st, 2007 AT 11:48 AM

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