Bad PCV valve or Valve stem seals

ti's 97 dsm · Jul 21, 2011

Ok, I've been searching this for a couple of hours and I've yet to find a definite answer. My oil is disappearing, I have done a compression test and its 160 across the board and I'm burning an excessive amount of oil, so would the PCV do this or valve stem seals? The valve stem seals where replaced at 98xxx. The car has a 6 bolt swap, and at 98k got a new head gasket, head, 1mm valves, dual valve springs, 3g lifters, new valve stem seals and fp2 cams. Any help would be greatly appreciated. Thank you.

g4ebguy90 · Jul 21, 2011

Your PCV valve just takes the vapors that rise from the crank and stuff back into the intake, Usually not a problem. The seals, you can usually tell when the car sits for a night, the oil drips down and gets burned at start up. Which will make a nice blue cloud of exhaust for a sec or 2. Perhaps you have a leak???

SniperMatt59 · Jul 21, 2011

i would check for a oil leak under the car, maybe the oil return from the turbo is leaking if you have just replaced it? other than that it could be the seals not put in right and have caused them to be bad

ti's 97 dsm · Jul 21, 2011

Honestly I don't have drip marks under the car but I'm pretty sure that near my oil filter housing/oil pan and crank pulley there is oil drips, but no where near the amount of oil I'm loosing.

knochgoon24 · Jul 21, 2011

If it's your PCV valve, you'll end up with a bunch of oil in your intake/intercooler piping.

The valve stems are probably still good since they're pretty new.

I'd look for leaks. Clean anywhere you see oil, drive it, then check back.

tenn-gsx · Jul 21, 2011

What kind of turbo and where are you sourcing the oil from? Im thinking maybe your pushing oil past the turbo seals either due to a bad turbo or excessive oil pressure to the turbo.

Calan · Jul 21, 2011

g4ebguy90 said:
Your PCV valve just takes the vapors that rise from the crank and stuff back into the intake, Usually not a problem.

Unless it fails...in which case a higher-than-normal amount of oil and blowby can get pulled into the IM during low load conditions if it's stuck open. If it's clogged up completely, higher crankcase pressure can eventually wear out seals, causing leaks.

OP:

1. Define "an excessive amount of oil" for us
2. How is the VC breather outlet set up?
3. Check the turbo for shaft play and clean everything/check for leaks as the last two posters mentioned.

ti's 97 dsm · Jul 21, 2011

I have an Evo 3 16g, no not ebay, and there is no shaft play, looks like im leaking oil out of the exhaust manifold gasket but its just there not like dripping its just kind of there. and I dont see any oil leaking anywhere. I'll double check in the morning.

Excessive as in I'll be good and a couple days later there's nothing on the dip stick.

Calan · Jul 21, 2011

ti's 97 dsm said:
Excessive as in I'll be good and a couple days later there's nothing on the dip stick.

Holy crap.

You either have smoke under the hood you're not seeing (leaking and burning off the manifold/exhaust), blue smoke out the tail pipe, or a puddle you haven't found yet.

Do a leak-down test on it.

http://www.dsmtuners.com/forums/articles-engine-fuel/338152-compression-leak-down-testing.html

SniperMatt59 · Jul 21, 2011

+1 to the leak down test

ti's 97 dsm · Jul 21, 2011

I dont see any smoke under the hood I have let it idle for awhile and nothing...But there has been times but not lately that I have started the car and kinda looks like a splash of oil behind the exhaust, But lately it just smokes especially at idle like literally there were black smoke rings being puffed out the exhaust and if I floor it just a giant black puff of smoke..I'm kind of lost at this point

Calan · Jul 21, 2011

Ok... it's probably internal. Either valve seals, rings, or turbo. But... burning oil is blue-white; not black. It's possible you are also running very rich (black smoke), and leaking the oil somewhere. Or the smoke is a combination of burning oil and being rich.

The leak-down test should point you in the right direction.

TalonJohn94 · Aug 31, 2012

Ever solve this problem?

96 GSX LOVE · May 5, 2015

Wondering if you ever solved this problem because I am smoking like crazy did a Blt, changed turbos, and comp. test 160 across the board and I am still smoking like crazy.

Slobonator4G63 · May 6, 2015

My 91 smoked pretty heavily and it was due to a bad pcv valve I needed up dumping a couple ounces of oil of of the intercooler. Degreased as power washed all the piping and changed the oil we'll I was at it and it helped out dramatically. I did use a thickening agent in my oil due to excessive ware on my rings how ever it purs like a kitten. But even if you doubt you pcv might be the problem is a pretty cheap fix if it is the problem

The Top DSM Community on the Web

Bad PCV valve or Valve stem seals

ti's 97 dsm

g4ebguy90

SniperMatt59

ti's 97 dsm

knochgoon24

tenn-gsx

Calan

ti's 97 dsm

Calan

SniperMatt59

ti's 97 dsm

Calan

TalonJohn94

96 GSX LOVE

Slobonator4G63

Similar threads

Latest posts

Build Thread Updates

Vendor Updates

Latest Classifieds