This is exactly indicating the failing cylinder.
When the revs of the engine change when pulling a plug, this means, at least
the spark plug is functioning and provides a spark for burning the fuel
mixture.
Idea can be as described in my engine overhaul story - lots of room in the
valve guide, giving oil the chance to pass to the combustion room. When
burning lots of oil, this caused in my engine lots of fauling.
Cheers,
Hans
----- Original Message -----
From: "Tom Gunderson" <Thgun@comporium.net>
To: <Mgs@autox.team.net>
Sent: Wednesday, July 02, 2008 12:02 AM
Subject: [Mgs] one cylinder plug fouled
> How do you test if one plug is not firing? I pulled the wire from one plug
> and the engine did not change. The plug seemed to be fouled black oil and
> soot. I changed the plug. I saw the same thing on it after driving about 5
> miles. Any Ideas?
> Tom G.
> 1500 MGA RST
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