2006 GMC Truck rough running, oil consumption

2006 GMC TRUCK
220,000 MILES • 6.0L • V8 • 4WD • AUTOMATIC
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ALLENGG1
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did headgaskets truck was fine, now running rough and consuming oil, seems to be getting sucked into the intake, this particular engine does not use a conventional pcv valve, what could the problem be
Jan 12, 2015 at 7:31 AM
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HMAC300
  • ✓ASE Certified Mechanic
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  • ASE Certified Mechanic
check the hose for blockage which is pcv return and it may be a gasket rubberon intake has slipped causing a vacuum leak. I assume truck has been scanned for codes and fuel pressure h as been checked with a gauge
Jan 12, 2015 at 7:49 AM
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JOHNNYT73
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  • 924 POSTS
  • ASE Certified Mechanic
I believe there may be a bulletin out for this issue. Using redesigned valve covers to correct the oil consumption issue.
Jan 12, 2015 at 8:25 AM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
truck must sit 15 minutes prior to checking oil per one tsb and on level ground as well as the pcv system must be checked for blockage which I've already sent the pic of where the hose is. The other tsb is essentially the same it just covers towing and higher rpm 3000 and above wil give you heavier oil ususage. IF not good do a consumption test on it.
Jan 12, 2015 at 9:43 AM
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