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

  • Tiny
  • afliess
  • 1988 Chevrolet Cheyenne
  • 80,000 miles

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

Sunday, November 4th, 2012 AT 1:53 PM

2 Answers

  • Tiny
  • JDL
  • Expert
  • 16,290 posts

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.

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Sunday, November 4th, 2012 AT 2:37 PM
  • Tiny
  • JDL
  • Expert
  • 16,290 posts

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

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Sunday, November 4th, 2012 AT 2:38 PM

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