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Engine Rebuilt engine leaking oil from cold air intake

  • Thread starter Thread starter zack2001
  • Start date Start date Jan 20, 2022

zack2001

Member
Dec 11, 2019
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1
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Lansing, MI
Jan 20, 2022
#1
  • Jan 20, 2022
  • #1
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

I gotta say i never painted my nuts, Never Ever
15 Year Member
Apr 3, 2009
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nevada
Jan 21, 2022
#2
  • Jan 21, 2022
  • #2
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.
 

manicmechanic007

5 Year Member
Sep 26, 2017
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Roy, Utah
Jan 21, 2022
#3
  • Jan 21, 2022
  • #3
Nasty indeed
Lets hope that oil was from when the previous engine malfunctioned
I agree with nickyb to clean it all out and go drive it then re evaluate
 

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor
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#4
  • Jan 21, 2022
  • #4
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.
 
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zack2001

Member
Dec 11, 2019
24
1
13
Lansing, MI
Jan 21, 2022
#5
  • Jan 21, 2022
  • #5
Noobz347 said:
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.
Click to expand...
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

Stangnet Facilities Maint Tech... Er... Janitor
Admin Dude
Jan 4, 1985
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Box behind Walmart
Jan 21, 2022
#6
  • Jan 21, 2022
  • #6
zack2001 said:
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?
Click to expand...
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

Member
Dec 11, 2019
24
1
13
Lansing, MI
Feb 10, 2022
#7
  • Feb 10, 2022
  • #7
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

I gotta say i never painted my nuts, Never Ever
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Feb 10, 2022
#8
  • Feb 10, 2022
  • #8
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.
 
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