Something isn't right here!!!! Need your help in diagnosing this.

[S4_SH1640]

Replaced PCV valve with a new one 2 days ago, now im getting more codes than before. Random misfires, and each cylinder misfire, system too lean at idle.

I ordered a new diverter valve, and will inspect connections with all vacuum hoses and valves.

Car drives fine, other than a long delay when i press the gas. In other words, turbo lag at its finest.



Any ideas??

[S4_SH1640]

Inspected all vacuum hoses and cleaned out some dirty connections and valves. Tightening some screws all over, i noticed that the exhaust manifold screws/nuts were kinda loose. So i took them completely out and replaced the gasket with a new one.

Did some cleaning around the PCV valve area and around the valve cover.







Problems still exists, Still have some kind of bad vacuum leak or something else. Not sure if the new PCV is good, maybe i got a defected one?

[S4'ed]

A properly working PCV system creates a slight vacuum in the crankcase (and in under the valve-cover). A bad PCV, with a torn pressure regulator valve diaphragm, can cause a high vacuum in the crankcase.

There is a vacuum leak somewhere....sometimes when the PCV goes bad, it causes a high vacuum in the crankcase, which can cause the rear main crankshaft seal to pull-off its mounting flange, then you get an oil leak and a lean-at-idle DTC. Are you leaking oil from the bottom of the bell housing, where the transmission meets the engine block?

Also, a worn front crank seal can cause excess air to be pulled thru the PCV system, causing the same lean-at-idle DTC.

[S4_SH1640]

A properly working PCV system creates a slight vacuum in the crankcase (and in under the valve-cover. A bad PCV, with a torn pressure regulator valve diaphragm, can cause a high vacuum in the crankcase.

There is a vacuum leak somewhere....sometimes when the PCV goes bad, it causes a high vacuum in the crankcase, which can cause the rear main crankshaft seal to pull-off its mounting flange, then you get an oil leak and a lean-at-idle DTC. Are you leaking oil from the bottom of the bell housing, where the transmission meets the engine block?

Also, a worn front crank seal can cause excess air to be pulled thru the PCV system, causing the same lean-at-idle DTC.

The front crank seal is good, the rear main crankshaft seal has a little oil residue, but nothing dripping or excessive.

[S4_SH1640]

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Changed PCV with a new one. In the photo i have the old one, and two new ones. PROBLEM STILL EXISTS!!

Not sure what else to look for, I will start by doing valve cover gasket, checking front main seal, rear main seal.


Could a bad vacuum pump cause too much vacuum?

[S4'ed]

The vacuum pump is only for the power brakes......has nothing to do with your issue.

[van462]

Be aware also we don't have whats normally just a valve cover. It also helps keep the cams in place. Not likely a source of the leak but check around the oil fill port. The rear main seal is the highest likely hood. You don't happen to have a lightweight crank pulley installed do you? The aluminum they are made of gets worn away by the front main seal (which is a pretty tough seal)

[S4_SH1640]

Be aware also we don't have whats normally just a valve cover. It also helps keep the cams in place. Not likely a source of the leak but check around the oil fill port. The rear main seal is the highest likely hood. You don't happen to have a lightweight crank pulley installed do you? The aluminum they are made of gets worn away by the front main seal (which is a pretty tough seal)

I am not sure at this point, Its probably leaking a little from the rear main seal, and the valve cover area maybe another 5% but i cant say that is what the problem is because before i decided to switch the PCV with a new updated one the car was running normal. As soon as i replaced the PCV, then all these codes started to come up. (And again, i replaced the PCV twice since then but it didnt fix the issue.) I wish i had kept the old one in good condition and put it back on.

[van462]

Actual that may be your problem as well. The New PCV when it was introduced also required a ECU update so the engine knows about the extra vacuum it pulls and extra air it will receive. On the earlier model cars where the software hasn't been updated the old PCV number should be used. Are any of the PCV you have end in AC or all AE?

[S4_SH1640]

The new "updated" ones end in AE, but the only one ends in A.

Based on the audi records that i have, it says that they did a '"software update" when they did the part 1 oil consumption test. So im guessing thats the update that they did?!


But i kept an eye on the rear main seal for a couple of days now, and it had a little oil residue 2 days ago, and just an hour ago, i noticed a full blown oil leak (In the rear main seal area). I already scheduled my mechanic to take a look at it, and i might have to bite the bullet and pay the price to have him change it. It seems straight forward, remove transmission replace seal. Nothing i havent done before, but holidays coming up and all, i just cant deal with it.

[S4_SH1640]

Something is causing these seals to blow!?! and i am not sure what but i am sure that these problems are getting old. I need something reliable. I dropped it off at my mechanic today and after it gets fixed, it will be up for sale.

any thoughts or suggestions?

[Jacon]

What is the old part number from the PCV you pulled off? Are you sure you replaced the correct PCV part number? Did the old PCV have the white top?

If you updated to the new PCV, you also have to 1) update the front main seal 2) get an engine reflash.

[S4'ed]

Something is causing these seals to blow!?! and i am not sure what but i am sure that these problems are getting old. I need something reliable. I dropped it off at my mechanic today and after it gets fixed, it will be up for sale.

any thoughts or suggestions?

Toyota Camry or Honda Accord

[S4_SH1640]

What is the old part number from the PCV you pulled off? Are you sure you replaced the correct PCV part number? Did the old PCV have the white top?

If you updated to the new PCV, you also have to 1) update the front main seal 2) get an engine reflash.

The old part number is 06H-103-495-A, with Black top.

The new PCV that audi has for my car is part number 06H-103-495-AE with white top.


After Audi did the part 2 oil consumption test, piston and rings, they have also updated my PCV, front main seal, and did the software update. BUT, the pcv that i had on the car was the black top. So i am not sure if it had white top originally, and then they updated it to black top.

Now they say that the one for my car is the white top.

I hope i didnt confuse you.
Thanks

[S4_SH1640]

It looks like it will need a rear main seal. $1200 job for a $50 dollar part.

Car is up for sale, i think i had enough. My b5 s4 is more reliable and it has over 200k miles.

[themadscientist]

...

Are you under the impression that it's supposed to run normally with the oil cap off?

[S4_SH1640]

^
run normal? no

run? Yes, all the engines that i came across... when or if you remove the oil cap, it shouldnt stutter or misfire.

[Jacon]

The old part number is 06H-103-495-A, with Black top.

The new PCV that audi has for my car is part number 06H-103-495-AE with white top.


After Audi did the part 2 oil consumption test, piston and rings, they have also updated my PCV, front main seal, and did the software update. BUT, the pcv that i had on the car was the black top. So i am not sure if it had white top originally, and then they updated it to black top.

Now they say that the one for my car is the white top.

I hope i didnt confuse you.
Thanks

There's your answer. It appears the dealer never updated your PCV. I believe version A is the original, before the Stg I consumption! Either 1) get the correct PCV matching the PCV you pulled off 2) drive it to the dealer and have them flash to the new PCV, but this will require you to verify they DID updated the front main seal. 3) Raise hell and ask why they never updated the PCV on your Stg I test.

[S4_SH1640]

There's your answer. It appears the dealer never updated your PCV. I believe version A is the original, before the Stg I consumption! Either 1) get the correct PCV matching the PCV you pulled off 2) drive it to the dealer and have them flash to the new PCV, but this will require you to verify they DID updated the front main seal. 3) Raise hell and ask why they never updated the PCV on your Stg I test.

Thats going to be hard to do because i am the second owner, well past any dealership warranty. And I asked them to have it looked it to see why the new updated PCV doesnt work for my car. and they ofcourse said "sure, we charge $130 something per hour....." meaning basically they would diagnose the car and i would pay for it. (which it shouldnt be that way because they had this problem with the b8s, as we all know.)

And the other thing is, I called the audi dealership that serviced my car during the period of the first ownership and they have it written down on their records as they changed the PCV and updated the software.

[S4_SH1640]

http://www.audizine.com/forum/showth...6#post11480576

[themadscientist]

I don't think you understand how these PCV systems work. The car sputtering and running rough will happen when you pull the oil cap on any 2.0 tfsi.

[S4_SH1640]

I don't think you understand how these PCV systems work. The car sputtering and running rough will happen when you pull the oil cap on any 2.0 tfsi.

Hopefully doing the rear main seal (thats leaking) and making sure the engine has no more leaks, will fix the issue. Then i will post a video to show the difference. When the car was running fine, i opened the oil cap to pour some oil in and the engine was still running fine, with a slight suction of the oil cap when you removed it. But now the vacuum has alot of pulling to the cap when you try to remove it, i understand that it should have some, but not as much as it does now. Either way, the oil cap is only a test, I have check engine codes for vacuum leak, and We are trying to diagnose the PCV or something else.

[wxsgt]

I had this exact same issue, pcv was replaced and the problem came back a couple weeks later. Rear main seal catastrophically failed and was causing the issues. took about 8 hours labor on my CVT but solved the problem

[S4_SH1640]

[S4_SH1640]

all good, this is how its supposed to run

[pierreb]

my 2010 A4 with fixed pistons and dealer ECU update had a black top PCV. Has been running APR stage 2 v2.0 since the week that came out (Jan 2015-ish I think?). PCV failed a couple of weeks ago and was replaced, still with a black top.
my 2011 Q5 with fixed pistons and dealer ECU update has a white top PCV. Runs GIAC stage 1. PCV failed about a week ago and I only replaced the diaphragm part. Runs great now.

[S4_SH1640]

my 2010 A4 with fixed pistons and dealer ECU update had a black top PCV. Has been running APR stage 2 v2.0 since the week that came out (Jan 2015-ish I think?). PCV failed a couple of weeks ago and was replaced, still with a black top.
my 2011 Q5 with fixed pistons and dealer ECU update has a white top PCV. Runs GIAC stage 1. PCV failed about a week ago and I only replaced the diaphragm part. Runs great now.

I replaced it with the blacktop now, and its working great.

you replaced the diaphragm? is that the round black top thing that has the clips all around?

[pierreb]

I replaced it with the blacktop now, and its working great.

you replaced the diaphragm? is that the round black top thing that has the clips all around?

Heh well I just talked to my indie and we think we're going to swap it to white top because the A4 car is throwing a lean code...some days, I swear...lol.

Yes the diaphragm is super easy and cheap to replace.

http://www.audizine.com/forum/showth...1#post10045400

[S4_SH1640]

Heh well I just talked to my indie and we think we're going to swap it to white top because the A4 car is throwing a lean code...some days, I swear...lol.

Yes the diaphragm is super easy and cheap to replace.

http://www.audizine.com/forum/showth...1#post10045400

I have a white top for sale if you want it. I bought it from audi, and a week later blew my rear main seal. so my mechanic put on the original black top PCV. So this is only a week old, maybe 100 miles or less. nothing wrong with it, just doesnt work for my car because its a white top.

Lmk. asking $50 shipped.

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[pierreb]

Thanks but he's getting one local for free since they replaced my last one just a couple of weeks ago and put on a black top one. I'm thinking my APR tune is expecting the white top PCV.

[Jacon]

I replaced it with the blacktop now, and its working great.

Good to hear and for future reference, you'll need to have the dealer update the ECU software if you update to the white top PCV. It's an hour of labor: ~$130.

[S4_SH1640]

Good to hear and for future reference, you'll need to have the dealer update the ECU software if you update to the white top PCV. It's an hour of labor: ~$130.

That's what i have been told but records indicate that when audi did the part 1 and part 2 oil consumption test, they replaced pistons and rings, and the PCV including...... the software update. So i figured it was a bad PCV or something else that was causing the problem. I went to audi, but the technician there didnt want to help me, i think i caught him on a bad day.

[pierreb]

So what's the part # of the one you have on the car now? I guess mine was an "AC" until today. When my previous PCV blew 2-3 weeks ago, it looks like it took the rear main seal with it. Rotten luck + stage 2 boost = new rear main seal.

[S4_SH1640]

So what's the part # of the one you have on the car now? I guess mine was an "AC" until today. When my previous PCV blew 2-3 weeks ago, it looks like it took the rear main seal with it. Rotten luck + stage 2 boost = new rear main seal.

Sorry for the late response.

The part was 06H-103-495-A with black top. And you should only stick with what it has now, unless you are doing the software update from audi.

[lettuce]

Sorry for the late response.

The part was 06H-103-495-A with black top. And you should only stick with what it has now, unless you are doing the software update from audi.

What year is your car? Mine's an 09 and had the stage 1 fix and takes an -AC PCV as the latest revision. Black top.

[pierreb]

What year is your car? Mine's an 09 and had the stage 1 fix and takes an -AC PCV as the latest revision. Black top.

Yeah well mine has been switched to AE now I guess but the next main seal after this one will be on my mechanic 's dime if it happens again.

Regardless, I'm not plugging that thing back into the intake manifold beside for inspection.

[lettuce]

Yeah well mine has been switched to AE now I guess but the next main seal after this one will be on my mechanic 's dime if it happens again.

Regardless, I'm not plugging that thing back into the intake manifold beside for inspection.

What do you mean, you capped off the port where it plugs into the intake?

[pierreb]

What do you mean, you capped off the port where it plugs into the intake?

Yup. Should help prevent carbon on the intake side and another seal blow from a busted PCV.

[lettuce]

Yup. Should help prevent carbon on the intake side and another seal blow from a busted PCV.

I wouldn't be so sure about that. Take a read through this thread. Plugging off the intake port on the PCV is most likely only going to give you more trouble with blown seals. Blew out three of mine.

[pierreb]

It's going back for the main seal on the 20th. We'll see if there's anything else leaking beside that but I doubt it. Anything beside the main seal will be on their dime.

I had read that thread and your misadventure before, thanks. Maybe read this post and see if it adjusts your thinking.