Engine Rebuilt engine leaking oil from cold air intake

zack2001

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Dec 11, 2019
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My vehicle is a 2005 V6.

I got an engine rebuild done due to the mistake of a shop jumping the timing of my engine doing a timing chain job and damaging the engine. A couple of days after getting my car back after the rebuilt engine was put in, I noticed oil started leaking out of the cold air intake filter. I did NOT have this issue before I took it into the shop to get the timing chain job done.

Is it possible the engine was damaged internally (from the timing jumping) somehow causing excessive crankcase pressure? I have replaced the PCV valve and hoses, which did nothing to fix the issue.

The oil in the picture does look milky but it's because of condensation in the engine, as I do live in a colder climate and my engine tends to stay below 180F the majority of the time.
 

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nickyb

WAIT,you now have a pair?
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Take the cai off, clean it out,make sure to clean the throttle body real good. Clean filter (or buy a new one)After its clean and dry run your engine and warm it up to temp. Then take the cai off and inspect it,I think you'll find it all o.k.
 

zack2001

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Dec 11, 2019
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Lansing, MI
You may need an air/oil separator depending on what you find.

I never needed one on the OEM engine but air velocity through the PCV increased significantly with the new engine.
I've cleaned the oil leak multiple times and after a couple of days, the oil leak comes right back. I've noticed that more oil comes out of the intake filter if I run the engine harder.

If I were to get an oil catch can, would getting it for the passenger side fix my problem, or does it not matter which side it goes on, as long as there is somewhere for crankcase pressure to be relieved?
 

Noobz347

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I've cleaned the oil leak multiple times and after a couple of days, the oil leak comes right back. I've noticed that more oil comes out of the intake filter if I run the engine harder.

If I were to get an oil catch can, would getting it for the passenger side fix my problem, or does it not matter which side it goes on, as long as there is somewhere for crankcase pressure to be relieved?
I would start by putting one in line with the PCV screen and valve and go from there.

I used some of those small oil separators for air compressors. It seems to work well enough but there are better solutions available.
 

zack2001

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Dec 11, 2019
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Lansing, MI
UPDATE: I bought a J&L oil catch can and it seemed to have made a difference, until today when I checked under my hood after I had been driving around for an hour, where I went into WOT at one moment.

I checked the oil catch can and it's not full, so what else could be causing this? Is the air intake to driver's side valve cover PCV hose to blame?
 

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nickyb

WAIT,you now have a pair?
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Do you have baffled valve covers? If not you could be Getting oil sucked up and dumped into cai.
You really need to go over all the hoses that suck crank case air.
Clean off pvc ,the screen under it( if you have one) , remove the valve cover and check baffle.
Lastly or first go back to the shop that f * **ed up.