high speed glazing

Dec 06, 2007 3 Replies
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Cheers fellas! I am experiencing high speed glazing, #4 plug, 1990 YJ 4cyl



5spd, causing a miss. Anybody have any experience with this? Hotter plug? Thanks Jim
1957 CJ5
1990 YJ
2006 TJ Golden Eagle

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Usual suspects first, plug wires, new plugs, distributor cap and rotor. Then a compression test. If #4 is low, and a squirt of oil brings it up, then consider a hotter plug, maybe. I'll bet it is the plug wires.

Cheers,

Earle

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High speed glazing can also be caused by a clogged fuel injector letting the cylinder lean out excessively. Might run a can of fuel system cleaner with the next tank. I like the Chevron Techron cleaner.
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Put in a new plug, glazed ones don't clean up well. And go one step colder. With glazing, heat is the enemy.

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Thanks Fellas! I knew you guys would have answers. Jim

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