WHY DID PCV PLASTIC COVER BLOW OFF ON MY 97 ...

  • Tiny
  • willietownsend
  • 1997 Chevrolet Silverado
  • 186,000 miles

Why did PCV plastic cover blow off on my 97 Chevy Silverado 5.7L?
I was trying to crank my silverado and the PCV plastic cover just blew off. It made a pop and blue smoke came from under hood and thats when I notice the plastic PCV cover blown off. What could have cause this to happen. I wish that it was some kind of way to post pictures to show what I am taking bout. The plastic PCV cover has the 90 degree elbow on it.

Wednesday, February 27th, 2013 AT 11:09 PM

6 Answers

  • Tiny
  • JDL
  • Expert
  • 16,290 posts

The pcv system may have a problem, clogged? Possibly too much crankcase pressure? With a warm engine remove oil fill cap, is it puffing out smoke? If so, that is blow-by.

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Wednesday, February 27th, 2013 AT 11:23 PM
  • Tiny
  • JDL
  • Expert
  • 16,290 posts

Just to add, I melted a piston, once, along the edge where the rings are located. The crankcase pressure was so high, it blew the pcv valve out of the valve cover and sprayed oil all over the engine compartment.

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Wednesday, February 27th, 2013 AT 11:27 PM
  • Tiny
  • willietownsend
  • Member

How can you correct this problem?

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Friday, March 1st, 2013 AT 2:50 PM
  • Tiny
  • JDL
  • Expert
  • 16,290 posts

It depends on the problem, if it has a lot of blow-by, piston rings.

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Friday, March 1st, 2013 AT 3:01 PM
  • Tiny
  • willietownsend
  • Member

I put that new plastic cover on and new PCV valve and it is driving good. I just don't want it to happen again.

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Friday, March 1st, 2013 AT 5:19 PM
  • Tiny
  • JDL
  • Expert
  • 16,290 posts

The new valve might have fiXed it, hopefully.

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Friday, March 1st, 2013 AT 6:59 PM

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