I need some guidance. My wife has a 4.3L Jimmy with a TBI. The
engine is getting too much fuel. Runs rough and will not idle below 2.5K
RPM. I can get it to idle below 2K RPM if I unplug one injector. The plugs
foul and soot pours out of the tailpipe. The injectors seem clear. I have
looked for vacuum leaks around the TBI. What are your suggestions for my
Had a similar problem on a truck I used to own, found out that the
thermostat was stuck open, so the engine wasn't heating up to proper
operating temperature, so was running rich. Make sure your engine is
heating up to operating temperature.
WHile this will cause it to be a bit richer than normal, it will not
cause it to load up and smoke unless you have problems other that a
bad T-stat. I recently bought my daughter a used car and it had had a
a bad Tstat form some time. It ran fine though. The only noticable
differenc in drivabilty with it was the tranny worked smooth because
it heated up correctly when Tstat was replaced.
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