[W126 Coupe] Fouled Spark Plug

[Markus Meyer]

Its not as hard as it sounds!  :)

Is the spark plug wet with fuel?  If you aren't sure, take it out, clean it
up, reinstall, start it up, drive it for a little bit, recheck when cool
enough to take out again.  If wet, its getting fouled from the leaky
injector.

Just like the engine has a spark plug for each cylinder, there is a fuel
injector for each cylinder.  Take off the air cleaner, follow the metal
lines from the stop sign shaped fuel distributor and you will see how one
lines goes to each injector.  Wherever the bad plug is, you want the
injector in the same location - so say the #4 spark plug is the one closest
to the firewall on the passenger side.  You want the fuel injector on the
pass side closest to the firewall as well.  There is a metal fuel line
connecting to the fuel injector, then an allen head bolt (be careful not to
strip this) that holds the fuel injector in place.  You may want to consider
replacing all if they are original, or just the one if they are newer.

What to do if the injector is leaking - simply replace it.  Or, you can try
to clean it out, there are some who claim success by doing this, but others
who don't.  Last time I replaced them they were about $35 per injector, plus
o-rings, etc.

Markus

On Tue, Sep 21, 2010 at 2:32 PM, Henry Viveiros <henryviv at oigp.net> wrote:


>  Well, I know how to change a spark plug, but I don’t know what to do to

> check the injector or what to do to correct the problem if the injector *

> is* leaking. I don’t even know how to determine which is the #4 injector

> or where it is.

>

> If I can determine these things and feel comfortable dealing with them I’m

> willing to try, but I really don’t know what I’m doing.

>

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