crossfire7

What the heck? My number 4 plug is caked with soot. The other 7 look fine. I need some help to fiqure this out. Thanks in advance.

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Pete K

I would look for a bad plug wire or a bad injector first. It does not appear to be oil fouled.

bogus

if that is a crossfire motor, I would be focusing on a bad wire.

crossfire7

The motor is a 383 w/ TPIS Miniram.

bogus

ok, do what pete said.

crossfire7

Ok, will do. The plug wire I can test. How do I test the injector?

Pete K

You can ohm test them all and see if they are consistant with each other. If 1 or more read low, you will know they are electrically bad. If they are mechanically leaking, they are difficult to diagnose. The cheap way is to swap #4 injector with number 2 and see if that plug craps up.

crossfire7

Thanks Pete and Bogus

Could the black plug have anything to do with the tune in the chip?

Pete K

Not likely. Our cars batch fire the injectors. They should all work equally(in theory anyhow)

crossfire7

So am I save to assume that there isn't anything wrong mechanically with the motor/valve train?

Pete K

You "may" have a guide or seal problem, but don't worry yet. If the cylinder is passing a small amount of oil, it could crap up the plug. Small chevy's usually dirty up #7 or #8 before the other plugs(regarding oil pumping).
Your pic does look like a secondary ignition or fuel injector problem.

crossfire7

Great info Thank you!

Pete K

I noticed that you edited the origion post to include a better pic. The 1 pic does seem to show oil fouling. However, that will happen after a plug carbons up and fouls. Like I mentioned, no panicking yet. Eliminate the other variables before upsetting yourself.

Randy93

It also apprears there is oil on the threads of all the plugs. I think the one is oil fouled, my number 7 looked the same last week when I changed mine.