oil inside intake plenum and on plenum gaskets?
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ahardb0dy
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oil inside intake plenum and on plenum gaskets?
When I removed the TB today when taking the plenum off to do the knock sensors there was oil on the bottom of the plenum just inside the TB, the plenum gaskets also had oil on them, could this be from a clogged PCV valve?
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elwesso
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Re: oil inside intake plenum and on plenum gaskets? (GQ Jay)
normally there will be a thin layer of varnish on the plenum... It wont be dry/sparkling... If it was thick, then it could be due to a bad PCV valve.
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ahardb0dy
- Posts: 192
- Joined: Tue Jul 19, 2005 5:06 pm
- Car: 1990 Nissan Sentra, 1994 Pathfinder Se, formerly owned: 2005 Nissan Titan, 1994 Infiniti Q45t, 1987 Nissan Hardbody SE-V6 4x4, 1980 Datsun 310GX
Re: oil inside intake plenum and on plenum gaskets? (elwesso)
this wasn't a dried substance it was like a little pool of fluid, I assume it was oil, it felt like oil
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Q45tech
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Re: oil inside intake plenum and on plenum gaskets? (ahardb0dy)
Oil vapor from PCV condenses inside plenum, dirt from air filter and carbon and other vapors from EGR..........combine and pool and eventually make their way down thru runners to area of fuel injection where they are washed on to valve stems and into combustion chamber.
Conventional oil evaporates roughly 2-4 times more in volume than the best synthetics..........therefore you can guess which will gunk up the plenum and throttle plate faster................per mile/hour of use!
NOACK numbers range from 4% to 15% [2006 minimum GF3] evaporation.........what is your oil test results?
Something like Mobil 1 full synthetic will cut oil in plenum in HALF!
Other than constant cold crank and very short trips highway cruising [EGR] adds the most oil.
http://www.swri.edu/4org/d08/p...l.pdf
Conventional oil evaporates roughly 2-4 times more in volume than the best synthetics..........therefore you can guess which will gunk up the plenum and throttle plate faster................per mile/hour of use!
NOACK numbers range from 4% to 15% [2006 minimum GF3] evaporation.........what is your oil test results?
Something like Mobil 1 full synthetic will cut oil in plenum in HALF!
Other than constant cold crank and very short trips highway cruising [EGR] adds the most oil.
http://www.swri.edu/4org/d08/p...l.pdf