My 1995 Chevy S-10 is running rich, Can someone help?

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countryman71981

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My truck is 1995 Chevy S-10 with a 4.3 V6 and it is MPFI and it is running rich. I have replaced the spark plugs, egr valve, spark plug wires, spider fuel injection, and my check engine light is NOT on. The little computer that you hook up to the truck says that all the sensors are working fine. I also must add that it is a mid year truck. It was made late 95 early 96. What could be my problem??
 
Does your engine have the air injection emissions? My 95 Caprice has an electric pump that sends extra air to the engine during start up, when engines run rich. The older model Caprice had a mechanical pump. If your truck has a set up like that, the pump could be failing or if it's electric like mine, it could have a blown fuse or bad check valves. Pick up a Haynes manual for your truck and see if you can find some more info there.

Good luck.
 
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