Anyone know what would cause this?
05-07-2009, 08:52 AM
#1
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Anyone know what would cause this?
I have no clue. 
Maybe the spark plug backed out? I did a change a couple thousand miles ago. I am at ~72000 miles. The coilpack is from #2. fml.
Maybe the spark plug backed out? I did a change a couple thousand miles ago. I am at ~72000 miles. The coilpack is from #2. fml.
05-07-2009, 09:26 AM
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I'm sorry - I don't quite understand what you are asking?
Are you talking about the rubber boot that messed up or something
in the tip of the sparkplug (very blurry picture).
Are you talking about the rubber boot that messed up or something
in the tip of the sparkplug (very blurry picture).
05-07-2009, 09:52 AM
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Melted coil pack? Coil pack on the top.
Yeah I can see now the sparkplug tip. Certainly that cylinder is running lean. There are many causes:
The melting of the center electrode results from abnormal combustion; for example, knocking or over-advance ignition timing. Misfiring will occur.
The melted ground electrode shown was caused by pre-ignition. Pre-ignition can result from hot spots in the combustion chamber, over-advanced ignition timing, lean air/fuel mixtures, deposits in the combustion chamber, defective cylinderhead or manifold gaskets.
Burnt valves can do that too.
Short making ignition too hot.
Bad shorted coil pack.
Improper gap
Replace the coil and the sparkplug and keep an eye. Run it and check out over and over.
Also take a compression on that cylinder then tell us the reading.
Yeah I can see now the sparkplug tip. Certainly that cylinder is running lean. There are many causes:
The melting of the center electrode results from abnormal combustion; for example, knocking or over-advance ignition timing. Misfiring will occur.
The melted ground electrode shown was caused by pre-ignition. Pre-ignition can result from hot spots in the combustion chamber, over-advanced ignition timing, lean air/fuel mixtures, deposits in the combustion chamber, defective cylinderhead or manifold gaskets.
Burnt valves can do that too.
Short making ignition too hot.
Bad shorted coil pack.
Improper gap
Replace the coil and the sparkplug and keep an eye. Run it and check out over and over.
Also take a compression on that cylinder then tell us the reading.
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05-07-2009, 12:03 PM
#8
The original torque spec for the plugs was 13 lb-ft. At some point there was a TSB that increased it to 18 lb-ft.
Yours is not the first to back out...
Yours is not the first to back out...
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