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2000 Deville
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1 Posts
Discussion Starter #1
OK -
New to this forum, so I apologize if something like this has been posted elsewhere, but I looked and couldn't find anything.

My number 6 cylinder is fouling plugs, its a slow process, takes about 6 months to completely fail. See photo. I have now had to replace this two times and would like to know why or what the root of the problem is.

I have had suggestions ranging from piston to fuel injector to you wouldn't believe me if I told you.

Anyway, any help on diagnosing the problem is greatly appreciated. This forum has helped me so much, everyone who participates here is the best. Keep up the good work!
 

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4,153 Posts
Looks like ash fouled plug caused by oil getting into the cylinder, bad fuel or fuel additives. Since it's happening with only 1 cylinder, I'd look more into oil leaking, possiblythrough the valve area.
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
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19,250 Posts
could be several things -

what brand and # spark plugs?

bad coil -
bad fuel injector -
oil leaking into #6 -
low compression -

because it is easy to do -
do a compression test on the front 4 cylinders -

with the engine running listen to the fuel injectors -
should be a distinctive CLICKING -

measure the resistance of the front 4 injectors -
note any difference -
 

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Super Moderator
White Diamond '03 DHS (with DTS floor shift)
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86,781 Posts
WOW! :shocked2: That looks like a growth on it.

Lot of carbon on it. I'd look at the injector first.
 

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2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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