1988 Chevrolet Cheyenne Would Truck Running Rich Puffing Out Black Smoke

1988 CHEVROLET CHEYENNE
80,000 MILES
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AFLIESS
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  • 2 POSTS
Why would the truck be running rich?
Puffing out black smoke from exhaust pipe
Nov 4, 2012 at 1:53 PM
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JDL
  • ✓ASE Certified Mechanic
  • 16,098 POSTS
  • ASE Certified Mechanic
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.
Nov 4, 2012 at 2:37 PM
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JDL
  • ✓ASE Certified Mechanic
  • 16,098 POSTS
  • ASE Certified Mechanic
Just wanted to add, does the crankcase oil smell like gas?
Nov 4, 2012 at 2:38 PM
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