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2001 Ford F-150 Smoke

Tiny
BOWHUNTER161
  • MEMBER
  • 2001 FORD F-150
  • V8
  • 4WD
  • AUTOMATIC
  • 111,000 MILES
I have a truck that smokes blue smoke sometimes when its crank. Sometimes it a little sometimes its alot most of the time there is no smoke. Also would like to know why it runs ruff when you remove the oil cap. The truck runs great. What could be happening?
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Monday, December 1st, 2008 AT 12:46 PM

1 Reply

Tiny
DAVE H
  • MECHANIC
  • 13,383 POSTS
Check PCV valve located in valve cover. Sounds like it may be sticking?

POSITIVE CRANKCASE VENTILATION
Positive Crankcase Ventilation (PCV) system uses intake manifold vacuum to recycle blow-by vapors from the crankcase to the combustion chamber, where they are burned. PCV valve meters flow of blow-by vapors, according to manifold vacuum. When high amounts of blow-by gases are produced (such as worn piston rings), excess gases flow back through crankcase vent hose into the air inlet and are burned during normal combustion.
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Monday, December 1st, 2008 AT 1:06 PM

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