Blow back

20

Asked by Jun 09, 2017 at 10:03 PM about the 1987 GMC Suburban R1500

Question type: General

I have 1987 GMC Sierra classic 1500
suburban I just had the valve cover gaskets
and intake gaskets replaced I have put it
back together now oil is coming out the
breather hole do the vacuum line have
something to do with that what's the issue

7 Answers

71,415

Check the pvc valve,

2 of 2 people found this helpful.
92,305

Make sure the PCV hose is hooked up to the intake and the valve.

2 of 2 people found this helpful.
20

It's new

92,305

Some blow by is normal. On an old engine it could be a lot.

1 of 1 people found this helpful.
Best Answer Mark helpful
20

Not having a valve cover baffle be the problem

1 of 1 people found this helpful.
20

The old one had one on it

1 of 1 people found this helpful.
92,305

You need the baffle.

1 of 1 people found this helpful.

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