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08-05-2024, 03:03 PM | #1 |
All about them K’s
Join Date: Jun 2014
Location: Land of Entrapment
Posts: 6,433
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Re: Are my spark plugs still misfiring?
Based on what I’ve read, I’d bet your valves are too tight, I prefer to adjust them with it running because your can get them fine tuned just right. I only 1/4-1/2 turn past when the pushrod stops tapping the rocker.(too loose) plugs could be an issue and are easy to change but it seems like you’ve ruled them out, I would have replaced them when doing the top end rebuild bit can certainly understand why you didn’t.
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Tyler '57 3100 http://67-72chevytrucks.com/vboard/s...d.php?t=813888 '72 K20 Cheyenne: 5” lift, 35’s, front dana 60 blah blah blah… http://67-72chevytrucks.com/vboard/s...d.php?t=662879 ‘69 K10 SWB: 4” lift 33”s… in a million pieces http://67-72chevytrucks.com/vboard/s...d.php?t=805206 '98 Silverado LT K2500HD ECLB Vortec 454/4l80E: 6" lift 35x12.5x20’s |
09-06-2024, 05:38 PM | #2 |
Registered User
Join Date: Oct 2008
Location: los angeles ca
Posts: 220
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Re: Are my spark plugs still misfiring?
Update on the misfire. I am using the factory spec spark plugs, AC Delco cr43ts. These are spark plugs with a built in resistor. Turns out that when I started the engine from dead cold in the morning, the truck ran great until it came up to temperature, then it would slowly laps into skipping from then on.
I just happened to spray some water on that, now very hot #7 exhaust manifold and noticed it was not sizzling off nearly as quickly as the others. I then pulled the plug wire off the spark plug and did not notice any change in the engine's idle. Once the engine cooled off, I removed the #7 spark plug and inspected with a very bright light which illuminated a very tiny micro crack which appeared to be highlighted by some black discoloration within this micro crack (approximately 1/16" in length) because I could not wipe it off, it seemed embedded in the crack. I ran my fingernail over it and could feel something so with that I used the sharp corner of a utility blade to try and get a better sense of what I feel is a very tiny crack. This may have been causing the misfire or perhaps the plug was somehow internally damaged, I'm still a bit unsure. I replaced this spark plug with a new one and the misfire is now gone and the engine is running smoothly. Has anyone experienced a resistor with the spark plug causing a misfire if I did not in fact have a cracked spark plug? |
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