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Please help read plugs, 7 good and 1 black? Please help read plugs, 7 good and 1 black?
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Kirkham Motorsports

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Old 10-30-2008, 12:53 PM
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Its black (too rich) not oil (no oil residue). Will try compression test. Same thing with two set of wires.
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Old 10-30-2008, 12:55 PM
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Originally Posted by garry viohl View Post
Its black (too rich) not oil (no oil residue). Will try compression test. Same thing with two set of wires.
OK, possibly a bad terminal on the distributor cap for that cylinder, or possibly a bad plug (cracked insulator that is really hard to see).
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Old 10-30-2008, 02:38 PM
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Originally Posted by garry viohl View Post
Its black (too rich) not oil (no oil residue). Will try compression test. Same thing with two set of wires.
If it's fuel fouling, then either the plug is not firing or is defective or a different heat range than the rest.

Good luck!
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