PCV Failed: Questions

[JustAliah]

So I bought a 2005.5 quattro a4 with 160k about 2 months ago (for $3500 if anyone is interested). Was looking for something lower miles, but the owner had plenty of maintenance records (New Turbo within 15k, New timing belt within 15k, full brakes within 10k, walnut shells 40k ago). Anyways, one of the reasons we got it quite a bit under asking price was because it had (a slight oil leak). Which I figured I could find and fix, worse case it's the oil pan.

Well, we drove it back, and within a few days of buying it, it started losing lots of power, didn't feel like there was any boost, and it started burning/using more and more oil (the last we drove it, it was literally 1 quart in 200-300 miles).

Well, I did some quick easy research, pulled the oil filler cap and felt the suction, so failed PCV it was.

Last night, went though and replaced the failed PCV with the BSH block off plate, replaced the ignition coils and plugs. Then.... removed the 3 rubber air hoses (turbo to intercooler #1, frame/metal piping to intercooler #2, intercooler #2 to throttle body) and WOW. Without exaggerating, between 1 and 1.5 quarts of oil ran out of the bottom hoses. I left the hoses off for a while while cleaning, to let it drain, then cleaned out the piping best I could before getting everything else bolted back up.

Well, my question is: what did you othe PCV failure guys do about all the oil caught through the system? Replace intercoolers? Remove them and clean? Spray carb cleaner through them? I do plan on taking the hoses back off in a week or so to clean again, then again after a month, just to see how much oil is still in the system.

Any help would be greatly appreciated. As of now the car is better, but am getting a misfire in cylinder 2, I swapped coils and plugs around and can confirm it is cylinder 2, now debating whether I should pull the manifold to replace/upgrade the injectors or try to track down the ignition control module? I don't have any time to work on it for a while, so time to come up with a plan, but that's the update. Thanks for reading!

[Low and Behold]

A few things..

1. you SHOULD feel suction when you pull the oil cap. If the car is idling its a vacuum. excessive suction is another thing... If you can't get the cap off then its definitely a problem.
2. I experienced TONS of oil coming out of the intercoolers, even after replacing the PCV. Turns out (in my case at least) it was a busted valve cover. Remove and inspect yours for cracks. A broken one will literally suck oil right out of the crank case and shoot it down into your turbo/intercoolers.
3. as for the oil stuck in the system, I got OCD one day and just removed and cleaned everything including the intercoolers. Might not have been completely necessary, but i had the time so i did it anyway

[Low and Behold]

Also food for thought - given the mileage theres a chance the VC has never been changed, and who knows how long its been since those IC pipes were disconnected.

Thats at least where I would start. Theres also a possibility that the turbo seals are bad which could definitely account for crazy oil consumption

[danbfree]

I do know that it is usually a bad valve cover that will leak oil into the PCV system causing it to fail and send oil into the intercoolers... From what I understand it is not just the gasket either but the valve cover itself cracking... I've seen OEM replacements for $225-275. And sorry, I got nuthin' on misfire since you already did the basics there, maybe someone else can confirm that a new injector would be next thing to try?

Edit: Got beat to posting first while getting distracted with work in the middle of posting, but good to hear I was on the right track with valve cover likely being the problem.

[Low and Behold]

Im too fast! Though I'm sure someone will chime in with a different opinion

[vce1232000]

The earlier vc was silver. Those have the highest % of failing from internal cracks. Get an update black cover. Another member here has a used late version http://www.audizine.com/forum/showth...Lots-of-stuff) for $50.00. Thats a great deal considering they go for $300.00 at the dealer. And the he is a person to deal with.

[Charles.waite]

went though and replaced the failed PCV with the BSH block off plate

This was a bad idea.

[danbfree]

The earlier vc was silver. Those have the highest % of failing from internal cracks. Get an update black cover. Another member here has a used late version http://www.audizine.com/forum/showth...Lots-of-stuff) for $50.00. Thats a great deal considering they go for $300.00 at the dealer. And the he is a person to deal with.

I'm seeing mostly silver ones out there, is there a certain part number to look for or at least when the update happened? Mine is considered a "late" B7 since it was made after December '05...

Nevermind, found 06D103469N as the part number to the updated one... $225 minimum new for OEM.

[Low and Behold]

This was a bad idea.

Totally agree on that.

[vce1232000]

This was a bad idea.

I have to with that. Those block off plates are news.

[vce1232000]

I'm seeing mostly silver ones out there, is there a certain part number to look for or at least when the update happened? Mine is considered a "late" B7 since it was made after December '05...

All the black VC are considered the updated versions from the silver. Think even the black vc has superseded part#. Not to sure that its a different version of them thou. Ive only came accross a few silver vc on earlier 2005.5 to November production dates.

Gotta watch the pcv also. There are 2 versions. 1 with an internal check valve built inside the hose adn without. Not interchangable

[danbfree]

All the black VC are considered the updated versions from the silver. Think even the black vc has superseded part#. Not to sure that its a different version of them thou. Ive only came accross a few silver vc on earlier 2005.5 to November production dates.

Gotta watch the pcv also. There are 2 versions. 1 with an internal check valve built inside the hose adn without. Not interchangable

Thanks, ya, I did find this part # to the black one as well if someone needs it: 06D103469N. Looks like $225-$270 so a good used one for $50 is steal.. But I'm glad to know that I probably have a black one and my PCV was a newer one but still also replaced under CPO warranty, but still need to figure out my oil consumption.. It's not horrible at a quart every 1000 but would like to bring that down.

[vce1232000]

It's not horrible at a quart every 1000 but would like to bring that down.

From what Im ing on here. The average qt is per 1000-1500 miles. So your in the average. I lucked out so far. Im averaging about 4500 miles per qt if I dont like a man....

[Charles.waite]

If you buy a black VC, you need a different PCV and a different VC->Turbo pipe as well. The stock stuff from the silver PCV probably won't work.

[Low and Behold]

It will work - connections are exactly the same. I've run both VCs on my car

tbh I don't even know if theres a difference between the black/silver VCs besides color and the fact they don't make the silver ones anymore.

[Charles.waite]

I'm assumign there is because the silver->black change was made at the same time as the PCV split as well. If the black VC was teh same as teh silver VC they wouldn't specify one series of parts for the silver VC cars, and another set for the Black VC cars.

I know they bolt up the same but I would presume some internal differences change how they work and make them not cross-compatible functionally speaking.

[Low and Behold]

Probably true. I had already updated my PCVs -> swapped in a silver VC from Clever's car -> ran it then eventually bought a brand new VC. So as it stands all my stuff lines up accordingly with each other (finally)

[atvhead]

Yes - get rid of the block off plate. Also make sure you only have one check valve in the PCV system - either one for the turbo pipe or one in the top guy.

[vce1232000]

It will work - connections are exactly the same. I've run both VCs on my car

tbh I don't even know if theres a difference between the black/silver VCs besides color and the fact they don't make the silver ones anymore.

I think the materials and internal design are different

[Jake@JHM]

The black ones are updated to prevent the PCV channels on the inside of the VC from coming apart.