I have a S10 pick with a 4.3L runs rich on both banks does have service engine light on.
Friday, December 28th, 2012 AT 3:51 PM
There may be a leak in the exaust near the oxygen sensors making it think it is running lean so it is dumping extra fuel cauising the rich situation. Look ofr exhaust leaks or the pressure regulator may be bad. Have the fuel pressure checked.