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Blow back - white smoke

Tiny
JOEGARCIA
  • MEMBER
  • 1985 GMC SIERRA
I am getting blow back on passenger side of my 1985 GMC Sierra pu trk. From breather tube into carburator, it's white smoke. Even after I shut the trk off. But it's not coming out the tailpipe. It still has good oil pressure. Can you help me?( Oh, the engine came from a 1987 pontiac firebird)
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Tuesday, April 5th, 2011 AT 4:08 PM

3 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
What about crankcase ventilation? If you remove crankcase oil fill cap, warm engine running, anything coming out? Are you losing coolant?
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Tuesday, April 5th, 2011 AT 7:16 PM
Tiny
JOEGARCIA
  • MEMBER
  • 3 POSTS
I pulled the oil cap off and yes it was smoking. Also, it idled up when I did and when I put the cap back on it idled down, running smooth. If it is losing coolant, could it be I need a new radiator? Also, I pulled the distibutor cap off and the coil i
s all rusty. Could that be part of the problem? I appreciate your help! Thanks, joegarcia
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Wednesday, April 6th, 2011 AT 1:35 AM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Blowby sounds like rings to me. If your losing coolant, check for an external leak. Does the oil have coolant in it?

You may need to check compression.
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Wednesday, April 6th, 2011 AT 3:10 PM

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