You guys seem like a well informed bunch. I hope that you can give me some
insight. I went back as far as I could in the threads but did not find
anything quite like what I'm having a problem with.
I've got a '91 S-10 Blazer with a 4.3 and it's been destroying plugs in
about 5-10 minutes (and I'm sure you know what a drag they are to
change-center driver side @#$%^&*). It fouls all 6 plugs black, not really
oily but they seem wet with gas when I pull them. It doesn't really seem to
smoke much but the exhaust has black carbon-like soot at the end.
Mechanically the engine seems to work fine. It has about 137,000 miles on
I've replaced the coil and ICM, cap, rotor, wires and plugs several times
now in the process. I figure it's the fuel injection system or something
that controls it (EGR, ECM, regulator, etc.) but I don't really know FI
well. I have not been able to get the fuel filter off, it's 10 degrees here
right now, and I'm working outside. It doesn't seem like a filter problem
though. I've had 4 TBI trucks and have never had a fuel delivery problem
before (probably just blind luck).
If it was a carb I'd figure it was running way too rich like the choke was
stuck. The last time I got it running I did get a check engine light before
it died. Engine starts, runs fast idle for a minute or two then starts
missing and running rough then dies. I can't get it anywhere to have it
tested because it won't run long enough and I'm getting desperate. I don't
find any obvious vacuum leaks.
Has anybody else seen anything like this or have any advice on where to
start? I'll probably need to figure out the codes but I'm not sure how
without the diagnostic gizmo that plugs in under the dash. I'd be greatly
appreciative. It's just a beater but I'd really like to get it running
right without replacing stuff blind, like I've been doing... Thanks for
whatever assistance you can offer - Russ