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#1 |
Registered User
Join Date: Jun 2002
Location: Kansas City, MO
Posts: 186
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Engine missing on one
I really need your guys help with a diagnosis. It all started with a couple plug wires that shorted out on the headers. I ran a while with the bad wires (kept wire from touching header) due to extreme weather and nowhere to change them. It ran a little rough since it was missing on a few cylinders. I recently went through and replaced wires and plugs. Still missing. Replaced cap, rotor, and coil. Still missing. You can hear it missing at idle and it is real bad driving at low rpm in low gear at a high load (at 35-40 mph in overdrive). It makes a metallic ticking noise with each revolution that gets really loud at high rpm. The tick is obviously coming from the left side of the engine. Can't decide if that noise is internal or an exhaust leak. I did the tube stethoscope trick and couldn't hear the tick in the valve cover. It was also louder underneath the truck (leading me to the exhaust leak). I haven't pulled the plugs back out to see which cylinder is missing, but with new plugs wires cap and coil I'm starting to think its a lifter or valve or something. It doesn't feel like the cylinder is totally dead though, it misses sporadically. Sorry for the long post, but if you guys could give me any input I'd greatly appreciate it!
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#2 |
402 BIG BLOCK
Join Date: Mar 2006
Location: McClelland IA
Posts: 286
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Re: Engine missing on one
check the timing too
__________________
1967 C10 swb 1970 GMC Jimmy 4x4 2005 Chevy tahoe Z71 2001 Chevy impala |
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#3 |
Registered User
Join Date: Dec 2006
Location: Minnesota
Posts: 130
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Re: Engine missing on one
check the oil for any metallic look to it. maybe pull a valve cover and check the rockers. a cracked manifold would likely get quiet once it warms up due to the metal expanding from the heat.
__________________
1986 IROC-Z lS1/T56 Moser 9" 78mm Turbo 1968 C10 step side, 5.3 Maggnacharger TVS1900 6L80E 2009 CCSB 5.3/6L80 4x4 http://members.cardomain.com/gflo383 |
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