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2001 Chevy Blazer pop and smoke from intake on start up occ

Tiny
MANNNO
  • MEMBER
  • 2001 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 140,000 MILES
From cap on top of intake (has 2 vacume lines one to map sensor other to valve cover) every now and then on start up a loud pop and white smoke comes from cap being blown off. Engine will not run because vacume leak. Cap will snap back on. Engine will crank and run great afterwards. I was told it was the fuel injetor system (spider) or the fuel pressure regulator valve.
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Friday, February 6th, 2009 AT 9:49 PM

1 Reply

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,549 POSTS
Check fuel pressure regulator by removing vacuum line to it. If gas is present then the FPR has a ruptured diaphram and would need to be replaced.

The popping back into intake, could be an injector, but could also be an ignition timing issue.

Check/clean electrical connections to cam/crank sensor, make sure plug wires are intact and not burnt.

Check condition of cap and rotor, and dist. Hold down bolt is not loose.

Is this 4.3 engine?
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Saturday, February 7th, 2009 AT 8:57 AM

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