In a message dated 6/18/00 8:29:31 PM Eastern Daylight Time,
mrzepkow@rochester.rr.com writes:
<< Yesterday I pulled the spark plugs to see what I could see, and the plug
coming out of cylinder number 1 was covered in black soot while cylinders 2,
3 and 4 were nice/normal. The center insulator on #1 was all covered in the
soot (flaky, black , not oily stuff) and the motors manuals say this is an
indication of running too rich in that cylinder, But why only that cylinder?
I went down to the auto parts store and bought 4 new plugs, all AC's but I
bought a one level hotter plug for the number one cylinder. Seems to be
working OK for the moment but this isn't my first time with this problem.
When I first got the car, number 1 cylinder would also foul up. A
compression test shows #1 and #4 are getting 160 lbs/sq in. of pressure in
compression while #2 and #3 get about 140 lbs/sq in.
So what is causing number 1 to "load up" the plug? Suggestions? Things I
should check further? Opinions? Ideas? >>
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When was the last time you adjusted the valve lash? This can easily cause a
rich on one cylinder problem, and it is a regular maintenance procedure. A
very easy procedure. I would do that, if you haven't in the past year.
Allen Hefner
SCCA Philly Region Rally Steward
'77 Midget
'92 Mitsubishi Expo LRV Sport
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