spark plugs melted
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Fleet Mechanic
Joined: Jul 2004
Posts: 1,552
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From: va
spark plugs melted
One side of my engine the electrodes on each of the spark plugs are rough, with a dark spot on the ceramic. I didn't check the plugs on the other side of the engine. I did those a few weeks earlier and threw them out. I used the platinum Champion $6.00 plugs. The engine was misses sometimes at idle. I found these reasons online
Over-advanced ignition timing
mike
Over-advanced ignition timing
- Too lean fuel mixture
- Excessive deposits accumulated in combustion chamber
- Insufficient cooling
- Too hot a spark plug fitted
mike
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Fleet Mechanic
Joined: Jul 2004
Posts: 1,552
Likes: 0
From: va
How about these things? Seems to run OK now no misses so far, I'll keep an eye on them. How do check for lean fuel? Can a bad coil cause this?
Over-advanced ignition timing
Over-advanced ignition timing
- Too lean fuel mixture
- Excessive deposits accumulated in combustion chamber
- Insufficient cooling
- Too hot a spark plug
Postmaster
Joined: Nov 2011
Posts: 3,533
Likes: 17
From: SW Florida
1. Yes, agreed. You'd have a code if it was lean, and it would also run hotter.
2. If you have carbon buildup, you'll also generally hear pre-ignition (pinging) under medium to heavy throttle and heavy load. If you hear it, time for some Seafoam or ATF or even just plain water to clean it out. Search or start a new thread for how to do it.
3. Yup, get it hot enough and it'll start pinging like in item 2, which can be caused by running lean as in item 1.
4. Did you change plugs to one with a different heat range? The length of the ceramic insulator on the plug determines it's heat dissipation capability, it's a heat sink as much as it is a HV insulator.
2. If you have carbon buildup, you'll also generally hear pre-ignition (pinging) under medium to heavy throttle and heavy load. If you hear it, time for some Seafoam or ATF or even just plain water to clean it out. Search or start a new thread for how to do it.
3. Yup, get it hot enough and it'll start pinging like in item 2, which can be caused by running lean as in item 1.
4. Did you change plugs to one with a different heat range? The length of the ceramic insulator on the plug determines it's heat dissipation capability, it's a heat sink as much as it is a HV insulator.
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Gary_51
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Oct 5, 2005 10:26 AM
