why do engine have a misfire on #5 cylinder?

1996 CHEVROLET SILVERADO
222,000 MILES
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JOE1953
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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.
Jul 5, 2012 at 4:51 AM
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RASMATAZ
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Inspect and test the no.5 injector-Also refer to this misfire link:
http://www.2carpros.com/articles/engine-misfires-or-runs-rough
Jul 5, 2012 at 5:11 AM
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RASMATAZ
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No.5 compression is bit too high -could be carboned build-up on that cylinder
Jul 5, 2012 at 5:21 AM
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JOE1953
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i haven't found any injector on this engine,where or the injector Located? this engine do have a Throttle Body.
Jul 5, 2012 at 5:45 AM
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JOE1953
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What cause carboned build-up on no.5 cylinder,and how can i fit it?
Jul 5, 2012 at 6:05 AM
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MHPAUTOS
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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.
Jul 5, 2012 at 7:11 AM
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RASMATAZ
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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
Jul 5, 2012 at 10:33 AM
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JOE1953
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where or the injector Located on this engine? i found the Throttle body.
Jul 5, 2012 at 5:14 PM
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RASMATAZ
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The injector is within the throttle body

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Jul 5, 2012 at 9:45 PM
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JOE1953
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How many injector this engine have? what store do i but the decarbonizer?
Jul 6, 2012 at 1:09 AM
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RASMATAZ
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Dunno if it has one or two injector-check on it while at Autozone or Napa and also for the decarbonzer
Jul 6, 2012 at 2:35 AM
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