WHY DO ENGINE HAVE A MISFIRE ON #5 CYLINDER?

  • Tiny
  • joe1953
  • 1996 Chevrolet Silverado
  • 222,000 miles

I took #5 spark plug out and it had Light brown deposits encrusted on the side or center electrodes or both so I put another spark plug in and it still misfire at idle, the wires or good, have 195 pound compression on #5 cylinder.

Thursday, July 5th, 2012 AT 4:51 AM

10 Answers

  • Tiny
  • rasmataz
  • Member

Inspect and test the no.5 injector-Also refer to this misfire link:
http://www.2carpros.com/articles/engine-misfires-or-runs-rough

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Thursday, July 5th, 2012 AT 5:11 AM
  • Tiny
  • rasmataz
  • Member

No.5 compression is bit too high -could be carboned build-up on that cylinder

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Thursday, July 5th, 2012 AT 5:21 AM
  • Tiny
  • joe1953
  • Member

I haven't found any injector on this engine, where or the injector Located? This engine do have a Throttle Body.

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Thursday, July 5th, 2012 AT 5:45 AM
  • Tiny
  • joe1953
  • Member

What cause carboned build-up on no.5 cylinder, and how can I fit it?

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Thursday, July 5th, 2012 AT 6:05 AM
  • Tiny
  • mhpautos
  • Expert
  • 29,787 posts

A faulty injector will cause this, you can get them sonically cleaned and flow tested it may be a good idea to have them serviced as the mileage is up there now. The money saved on fuel will pay for the job in no time.

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Thursday, July 5th, 2012 AT 7:11 AM
  • Tiny
  • rasmataz
  • Member

Oil in cylinder -Recheck the compression on no.5 I could be wrong on the compression specs-if it is use a decarbonizer-the reason I've mention carbon is your mileage

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Thursday, July 5th, 2012 AT 10:33 AM
  • Tiny
  • joe1953
  • Member

Where or the injector Located on this engine? I found the Throttle body.

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Thursday, July 5th, 2012 AT 5:14 PM
  • Tiny
  • rasmataz
  • Member

The injector is within the throttle body

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Thursday, July 5th, 2012 AT 9:45 PM
  • Tiny
  • joe1953
  • Member

How many injector this engine have? What store do I but the decarbonizer?

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Friday, July 6th, 2012 AT 1:09 AM
  • Tiny
  • rasmataz
  • Member

Dunno if it has one or two injector-check on it while at Autozone or Napa and also for the decarbonzer

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Friday, July 6th, 2012 AT 2:35 AM

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