Mechanics

CHEVROLET CHEYENNE GAS PROBLEM

1988 Chevrolet Cheyenne • 80,000 miles

Why would the truck be running rich?
Puffing out black smoke from exhaust pipe
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Afliess
November 4, 2012.



How long since a tune-up? Any applicable trouble codes? Use a gage and check correct fuel pressure. Also, see if pressure will hold for a bit, with everything off. You may need to block supply and return lines. Check the vacuum line at the pressure regulator, where applicable, for signs of gas. Check the coolant temp sensor.

JDL
Nov 4, 2012.
Just wanted to add, does the crankcase oil smell like gas?

JDL
Nov 4, 2012.