Spark plug melted?
Sick 'n Tired
Joined: May 2006
Posts: 2,969
Likes: 47
From: League City, TX
Eh? That doesn't make any sense. Need some specs. 5.4L or 4.6L? How many miles? Year?
Junior User
Joined: May 2008
Posts: 76
Likes: 0
From: Beavercreek, Ohio
Sounds to me like preignition has occured. Typical symptoms are melted electrodes on the spark plugs. The spark plug insulators are white, but may be dirty due to misfiring or flying debris inside the combustion chamber that can lead to engine damage. Things your shop needs to check for are correct plug heat range, over advanced engine timing, lean fuel mixture, insufficient engine cooling and lack of lubrication. Hope this helps!
Jim
Jim
Senior User
Joined: Feb 2003
Posts: 466
Likes: 0
WTF!!!!
Post pictures and I might believe it actually might happen.
Add it up, Spark plugs melting is not going to happen.
Porcelain cannot melt, electrodes burn off to carbon, stainless heat shields have a higher melting point than aluminum heads & blocks, piston will burn through before aluminum will melt.
At this point, I can only believe that the term melting is being used wrong. I do believe and have rebuilt many burn throughs over the years.
Burn throughs will happen from too far advanced or retarded timing and/or repeated pre-ignition.
Post pictures and I might believe it actually might happen.
Add it up, Spark plugs melting is not going to happen.
Porcelain cannot melt, electrodes burn off to carbon, stainless heat shields have a higher melting point than aluminum heads & blocks, piston will burn through before aluminum will melt.
At this point, I can only believe that the term melting is being used wrong. I do believe and have rebuilt many burn throughs over the years.
Burn throughs will happen from too far advanced or retarded timing and/or repeated pre-ignition.
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