dude54758

So i picked up a 216,xxx mile 944 yesterday o_0 On the way home i noticed i was burning oil at the top end 4.5 rpms + under heavy load. So today when i began my timing belt teardown i noticed i had a **** load of oil in my airbox. When i went to remove the J boot it just ripped right in half at the TB. River of oil came out.

Now i am trying to find the likely culprit. AOS? High mileage blowing to much compression out of the block? Some doof nutz over fill my oil to much?

In the end i am going to replace the aos seals just to make sure. But since it is a high mileage unit and i have no intention on really tearing down the block quite yet, Can i cap off all the aos stuff and have it dump into a catch can instead of my intake? IF so is there a guide for people installing catch cans around here?

xsboost90

i would just clean out the aos, replace the seals and clean the intake etc and put it back together stock. It could have some blowby getting into the jboot but unless you pipe in an integrated catch can i wouldnt bother.

Fara

Probably the AOS, but I'd recommend doing a compression and leak-down test to check the health of your valves and cylinders.

Hollywood D

Some oil in there is normal. Like was said, check aos seals.

Fara

Also, based on the fact that you are burning oil in the top end of the rev range, it's possible that your valve springs are a bit more tired than average and causing some floating. Again, it's hard to say for sure without checking the spring rates on them.

dude54758

Some oil is normal but not a cup or more.

dude54758

I thought this as well but its only under big load. Can wind out first and 2nd and most of 3rd before it happens. If i am in 4th at 3 grand and nail it it starts huffing smoke by 4. So it seems load based.

dude54758

I dont have emissions where i am so honestly i would love to just catch the vapors in a can anyway.

dude54758

Can someone explain why when the aos seals leak it draws oil into the intake boot?

V2Rocket

Oil in the airbox usually means you overfilled the engine...

Try an oil catch-can in the meantime for any vapor.

John_AZ

I'll take a shot.

With good AOS seals, the engine vapor recirculates correctly and the oil mist collects in the AOS housing, then goes back into the engine pan.

With bad AOS seals, oil will leak down the out side of the engjne below the AOS housing. The leaky seals will also draw additional air into the engine and the normal intake vacuum will draw the engine vapors/oil mist into the air intake "J" tube.

John

dude54758

I noticed it was above the the full mark a tad when i got it. Owner claimed it took 6.5 quarts.

Hollywood D

When you pull the aos off, its a good time to replace the speed and reference sensors that are behind it as well and take a look at the other stuff back there. Makes it a lot easier when the bigger parts off.

dude54758

When i took my t-belt cover off there was a sticker stating it was changed last septmber so i think i will hold off on that till the winter. Its going to be snowing soon in WI. I figured i should prob put some miles 200 or on the car so i can have a check list for the winter fix.

my front seals leak though that a major job or a in car job.

V2Rocket

Want to mail me the torn-off part of the J-boot? I have an actual use for it