WHY WOULD THE TRUCK BE RUNNING RICH?PUFFING OUT ...

1988 Chevrolet Cheyenne

Tiny

afliess

November, 4, 2012 AT 1:53 PM

Why would the truck be running rich?
Puffing out black smoke from exhaust pipe

FOUND 740 RELATED QUESTIONS

Black Smoke Coming From Exhaust

65 ANSWERS
100 IMAGES

Smoking

32 ANSWERS
48 IMAGES

2 Answers

Tiny

JDL

November, 4, 2012 AT 2:37 PM

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.

Tiny

JDL

November, 4, 2012 AT 2:38 PM

Just wanted to add, does the crankcase oil smell like gas?

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Replace Fuel Pressure Regulator
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