[W126 Coupe] Fouled Spark Plug

[Markus Meyer]

You might have a different issue then. In my case the fouled plug was
causing it to fail emissions, when I pulled it, I found the obvious wet
one.  If yours isn't wet, but dry black coating, that could be something
else going on.

On Tue, Sep 21, 2010 at 2:53 PM, Henry Viveiros <henryviv at oigp.net> wrote:


>  Thanks, Marcus – I’ll give it a try. The first time the Mercedes

> dealership found the problem and replaced the plug. That was a few months

> ago, and the plug end was coated with lots of black “stuff” so that the

> insulated cone and the “L” shaped tip were all encased.

>

> This time the plug was coated with a somewhat hard substance that I cleaned

> off with BrakeKleen and an Exacto knife. Now that it is relatively clean, I

> will remove the plug again and see what it looks like. I just bought a new

> spark plug socket so I’m eager to go.

>

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>

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