MISFIRE

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STRUXGL
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I SAW A POSTING ABOUT SOMEONE HAVING TROUBLE WITH MISFIRE ON #5 CYCLINDER ON A 1999 CHEV TAHOE. dO YOU KNOW THE OUTCOME OF HIS PROBLEM?
ALSO, HOW DO I TAKE A VACUM READING ON MY 1998 CHEV TAHOE WITH A 5.7 VORTEC ENGINE? wHERE DO I SCREW IN THE VACUM GAUGE?
Dec 3, 2006 at 9:05 PM
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HYKNRD
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Not sure about the outcome of the other guy. A vacuum test is generally done with the engine warmed. You need a vacuum source(hose or pipe) from the intake manifold to hook to the vacuum gauge. All vacuum gauges I've used haven't threaded into anything, just hooked up by a vacuum hose. Plug whatever you disconnected.
At idle the gauge should be steady at about 15-20 inHg. Rev the engine and let off. The gauge reading should drop and then return to normal. If you have a misfiring plug the gauge reading will occasionally drop about 1-5 in.Hg.
Any other readings will let you know any other aspects about the conditon of the engine.
Hope that helps
Dec 4, 2006 at 5:12 PM
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ARIPEKADEBI
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I had my check engine codes checked today. P1281, P0108, P0320, P0351, P0300, P0301, P0303, P0420, P0306, P0307 are the codes that were displayed. I am wondering what your point of view is concerning the amount of codes and what to do to repair.

Thank You for your time,
Dec 15, 2011 at 3:38 AM
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JACOBANDNICKOLAS
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There are many that deal with misfires. It could be fuel problems, plugs, coil, internal engine issues...
Jan 30, 2012 at 1:00 AM