spark plug damage
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Senior User
Joined: Dec 2002
Posts: 373
Likes: 1
From: Wallaceburg On.
spark plug damage
I just replaced my plugs. They had about 30000 miles in my 79 351m.5 were in good shape, 2 had the electodes broken or burned off even with the insulator and one had the insulator almost totally missing. I have never encountered this problem before. Have I got a problem or can anyone advise the cause.
Thanks in advance
Greg
Thanks in advance
Greg
Posting Guru
Joined: Jul 2001
Posts: 1,613
Likes: 2
From: Gainesville, FL
spark plug damage
Greeny,
This is a sign of a burned valve or advanced timing.
Does your truck "ping"? If so, you've burned the valves.
Do a compression test.
I'll bet the cylinders with bad plugs show low compression. If so, pull the heads and replace/rebuild your head/valves.
What size motor is this?
KingFisher
This is a sign of a burned valve or advanced timing.
Does your truck "ping"? If so, you've burned the valves.
Do a compression test.
I'll bet the cylinders with bad plugs show low compression. If so, pull the heads and replace/rebuild your head/valves.
What size motor is this?
KingFisher
