Low oil pressure, again - PCV LINE - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Low oil pressure, again - PCV LINE
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Posted by Brucer (more from Brucer) on Mon, 29 Jul 2013 19:34:41 Share Post by Email
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The Kreen came in today. The engine still warm, I opened the hood and the bay smelled a little too "oily". Looking around I finally pulled the shroud to discover the PCV line disconnected from the TB, (T-5 Turbo engine). The lines are fitting very loosely on the TB and the nipple to the engine, (which was almost off). I wiped out the TB in the spring so I know it was attached then. The PCV valve seems to check out still one directional. I have some vacuum line and will replace those in the morning to see how loose the old lines are cold for comparison. Interestingly, in the past I knew I had a vacuum leak as it ran noticeably rough at idle, this time it was not super obvious.

Could a disconnected PCV line at the TB, (so the PCV is still in the line to the engine), cause a hot idle low oil pressure condition, (some weird effect on the oil pressure relief valve?)? While it could still vent, albeit through the valve, I don't know if the negative pressure at idle in the TB is needed for proper venting, or if that would even have any effect. Obviously when the turbo is pressuring the system the crankcase is not venting, but that would be a non-idle condition.

posted by 75.28.18...

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