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#2921769 - 10/08/15 10:39 AM Driver's Side Valve Cover Breather & Oil
MM54 Offline
Member

Registered: 10/17/13
Posts: 353
Loc: NE Ohio
Long story made short:

A while ago when I replaced my IACV, the old one was full of oil, and the TB and plenum also were coated. I cleaned it up a bit and found that the line leading from the driver's side valve cover to the intake was oily inside (nowhere else the oil could be coming from)

Recently I put a catch can in line with that breather, to keep oil out of the intake (I've had one on the PCV line for a while too, and it catches quite a bit).

In 150-ish miles, though, I have caught absolutely zero oil in this breather line - not even residue in the bottom of the can. In the same time, the PCV one has caught, say, 1.5 mL or so.

Is this breather really that slow, that it takes thousands of miles for any noticeable oil to get through, or is something going on and the breather not breathing? Any ideas?
_________________________
-Matt

2002 P71 - 205k miles, Stage V DOWRS* - Sold 18 Sept 2019
1971 Chevrolet Chevelle - Rolling Project
1985 Mazda RX-7 - Summer Daily
1999 Toyota 4Runner - Daily Duty, P71 Replacement

*Dynamic Oxidation Weight Reduction System
Stage V: Terminal Rot

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#2921775 - 10/08/15 11:34 AM Re: Driver's Side Valve Cover Breather & Oil [Re: MM54]
BigMerc96 Offline

I know nothing
Posting Addict

Registered: 06/05/10
Posts: 19868
Loc: I can see Detroit from here!
That makes sense if you think about it. The breather on the drivers side is the air INLET for the PCV system. Air flows into the engine thru that hose, and is sucked back out by the PCV valve on the other side. Only thing that passes thru that hose if everything is working correctly is clean air from the intake tube. Now upon shutdown, oil vapors can come back up out of the valve cover and condense in that hose and thats likely what you saw built up in it from the 177k miles your car has. If you ever remove the oil filler cap when the engine is hot, you'll likely see the same oil vapors rising out.
_________________________
-Steve

2006 Audi A6 ~132k miles, stock.
1998 Mercury Grand Marquis LS HPP ~100k miles, slowly acquiring modifications.
1997 Town Car Cartier ~145k miles, Ported Plenum, Gutted Airbox, Contour E-fan Retrofit, Dual exhaust with Magnaflows, cats deleted, MSD Ignition, KYB Gas-A-Justs, P71 front bar, air ride reinstated, Projector retrofit, Caddy 4-note horn retrofit, Wood rim steering wheel retrofit, holistic weight reduction as the parts fall off..
1996 Mercury Grand Marquis GS 117,485mi. R.I.P. 7/14/12 frown

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#2922023 - 10/09/15 08:01 AM Re: Driver's Side Valve Cover Breather & Oil [Re: MM54]
MM54 Offline
Member

Registered: 10/17/13
Posts: 353
Loc: NE Ohio
The oil in the intake wasn't condensed vapors - it was (and sort of still is, I didn't get it all) coating the TB and inside the plenum, as well as all through the line to (and the inside of) the IACV - that sounds like oil coming in while the engine is running, not vapors coming in and only happening to go towards the engine, including onto the TB and plenum behind the butterfly and into and through the IACV, both of which should be closed with the engine off.
_________________________
-Matt

2002 P71 - 205k miles, Stage V DOWRS* - Sold 18 Sept 2019
1971 Chevrolet Chevelle - Rolling Project
1985 Mazda RX-7 - Summer Daily
1999 Toyota 4Runner - Daily Duty, P71 Replacement

*Dynamic Oxidation Weight Reduction System
Stage V: Terminal Rot

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