Replaced PCV. Car Still not fixed but runs fine when its plugged.

[xbnipx]

Hi guys I just replaced the PCV valve today however the car still runs rough at idle and will misfire in all cylinders given time.

However if I plug up the tubing to the intake it runs like it normally does and the misfiring goes away. Am I missing something?

[van462]

Look for an oil leak from the front main seal, or from between the engine and transmission. The engine expects a vacuum from the PCV. If a seal has failed it allows the block is leaking air in. This lean condition can cause misfire.

[xbnipx]

Look for an oil leak from the front main seal, or from between the engine and transmission. The engine expects a vacuum from the PCV. If a seal has failed it allows the block is leaking air in. This lean condition can cause misfire.

I thought the rear main seal produces oil leaks due to a pressurized block?

[gk404]

From what I understand, block isn't pressurized but under a slight vacuum.


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[xbnipx]

Ok I went to advanced auto parts and bought two $4 Rubber Expansion Plugs (P/N: 02608). I plugged the PCV and the intake manifold. The rear breather hose is still connected so it will still vent under boost into the intake hoses (similar to catch can setup). This is a temporary fix so the car won't misfire and can driving normally. Hopefully a new breather hose between the IM and the PCV will fix it :/. Let me know if you guys have any other tips or suggestions

[van462]

I tried someting similar to this. I found when I removed my oil cap, the bock was slightly pressurized vs in vacuum. Under boost it would pressurize enough that it would wistle from the air escaping. Granted I have an 09 with the old piston/ring style and get more blowby. I am not sure the PCV allows air to the back vent to turbo until it gets boost pressure on the IM side.

[xbnipx]

Did your PCV valve go too? I also have a 2009 B8.

[Militant-Grunt]

Ok I went to advanced auto parts and bought two $4 Rubber Expansion Plugs (P/N: 02608). I plugged the PCV and the intake manifold. The rear breather hose is still connected so it will still vent under boost into the intake hoses (similar to catch can setup). This is a temporary fix so the car won't misfire and can driving normally. Hopefully a new breather hose between the IM and the PCV will fix it :/. Let me know if you guys have any other tips or suggestions

While thats probably a little better than the engine misfiring on idle, I wouldn't recommend driving around like that. You're effectively disabling the vacuum pull of the crank case pressure. Look around for oil leaks, especially from the rear main seal. It is quite common.

[xbnipx]

While thats probably a little better than the engine misfiring on idle, I wouldn't recommend driving around like that. You're effectively disabling the vacuum pull of the crank case pressure. Look around for oil leaks, especially from the rear main seal. It is quite common.

I'm hoping its just a breather tube issue. This is just a temporary fix. However isn't there a vacuum under boost because the other breather tube is connected to the turbo?
If I am not mistaken the setup I have right now is the same as a catch can setup minus the catch can?:

http://bd8ba3c866c8cbc330ab-7b26c6f3...ch_Can_Kit.pdf

Please let me know if I'm incorrect. Thanks

[SleeperCar]

There was a TSB for crank case pressure on my 2013, have you checked for a TSB on yours?

[Shoreaudi]

Watching this as I am waiting on a PCV kit from ECS. Car had a squeal that I thought was the drive belt. Took the oil fill cap off and the noise went away. Pulled the codes and it gave all cylinder misfires and an intake leak. I'll let you know how it works out after I change out the parts. Also I have an 09 2.0 TFSI, motor replaced by Audi at 50k, now at 83k. Good luck.

[xbnipx]

Thanks. Funny thing is i hear high pitch squeals too. They are like clicky chirps and happens from time to time. I will diagnose further later


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[xbnipx]

Wait a second. Could this cause my issue? This bolt is on the intake camshaft. I'm guessing if there is a leak it will lead right to the valve cover->pcv->breather-> intake manifold

Same year as me and oil residue is in that area!!

https://youtu.be/SrYQ3Xe858c


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[van462]

That "bolt" is the actuator that advances your intake cam timing. thecover on the front is an electrical solenoid that pushes on a plunger, the plunger uses the oil pressure to fill a chamber and change the intake timing. The block pressurizing either thru the PCV failing and allowing air into the block during boost or if there is enough blowby that cant' be relieved by the PCV. The fact that plugging the intake manifold fixed the idle issue indicates its a lean condition (extra air). The timing actuator would misfire more RPM specific. The intake cam position sensor should also "see" the cam isn't being actuated when commanded.

[Shoreaudi]

Installed the PCV kit from ECS today and the engine is running perfect. Kit consists of new PCV, both hoses and new hardware (really didn't need hardware). The PCV valve is Vaico brand you can get from Advance, the rest is OEM. My old hoses did seem restricted when I blew air through them. Must have gotten it on sale because it's about 35 dollars more now. I would get new hoses since you already did the valve. Cleared the codes and ran a new scan and all is good. Threw in a new air filter as well. Good Luck if you haven't already fixed it.

[jbeckford1]

Wait a second. Could this cause my issue? This bolt is on the intake camshaft. I'm guessing if there is a leak it will lead right to the valve cover->pcv->breather-> intake manifold

Same year as me and oil residue is in that area!!

https://youtu.be/SrYQ3Xe858c


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short version: not sure if you have fixed your issue as yet, but i believe we may be in the same boat.
I believe a simple ring/gasket may be my issue, but can't find the part number. alldataDIY.com refers to it as the Camshaft Adjustment Valve - Pic1.
The seal sits inside of the housing the valve is removed from. My seal seems to be a basic round one, but it's flattened [old/hardening].
I used a T30 socket with a 1/4" to pull the 3 bolts, it's tight in front, lol.

Pic1

Pic2

Pic1 and Pic2

Long version:

2009 A4 2.0T Quattro 101k
Oil Consumption Stage 2 Fix May 2015 including new head by dealer.

A few weeks ago car started with a slight whistle/hiss while under boost, then the idle began to deteriorate where i had multiple misfires on all cylinders. The misfires, stopped when the IM was plugged as you have. Replaced PCV although diaphragm seemed fine, no real improvement but hiss got worse. Then i found i had an oil leak, and looking over all replaced parts saw the RMS was not included in list. Assumed RMS and purchased the "upgraded" replacement from XLR8/iAbed. However noticed more oil seemed to be at front of motor. I traced it up to the find the lower portion of the top timing cover caked with oil. So now I'm on a mission to find that seal. Wish me luck.

[xbnipx]

Hmm I have leaks in the front of the engine as well. I will check the front timing cover when I have the time. I'll also run a diy smoke test.


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[jbeckford1]

The saga continues, but just changed out these parts today today:

Short:

6L109259A Camshaft Adjuster Magnet $126.67
WHT007212 52mm x 3mm O-ring $3
4H0973702A 2-pin connector *note1 $5.80

Camshaft adjuster was definitely leaking and apparently blew the 15a fuse below ECM. Car had zero boost; fuse fed n205 (this valve), n75, n80, wastegate. Idle is still crap unless IM blocked off, whistle persists.
I can only hear the whistle/chirp during cold idle @1k, or under boost. Going to clean up again to see if there is a leak from front seal main seal.
note 1, the original connector will plug in fine into the new Camshaft Magnet, however the locking pin will now be on the other side. You can carefully disassemble the outer connector with a 2mm wide flatblade, but i just destroyed it off since I bought the new connector. Pin1 is yellow/red stripe at top/round end of connector.

Long:

soooo while searching for the part number for the O-ring (not gasket as I was searching, lol). The same 15a fuse below the ECM that powers this valve, cam adjusters, n75 and wastegate blew, so the car had 0 boost. Replaced the 20a that was in there, drove around the block, boost was back then fuse blew again. No idea who put a 20a in place of the 15a! Decided to buy local ($41 more vs ECS) as there were a host of codes and she is back to her hissing self. :-/
Funny though, I installed my Podi gauge one night - bored, and before blowing the fuse boost would peak at 18-20psi. Now it peaks at 15psi and drops sharply.
Shoutout to my girlfriend who's laughing at me for posting on a forum. "Must be an old guy thing..." I'm 37, she's 21... ;)
Sidenote; looking at the catch-can pdf, the IM being blocked off is halfway to a catch install... hint, hint.
anyways, here are the codes pulled using Carista:

OBD2 - confirmed:
P2008 - Intake Manifold Runner Control Circuit/Open Bank 1
P0010 - "A" Camshaft Position Actuator Circuit/Open Bank 1
P0243 - Turbocharger/Supercharger Wastegate Solenoid "A"
P0444 - Evaporative Emission System Purge Control Valve Circuit Open
P2400 - Evaporative Emission System Leak Detection Pump Control Circuit/Open
P2401 - Evaporative Emission System Leak Detection Pump Control Circuit Low
P2009 - Intake Manifold Runner Control Circuit Low Bank 1
P2088 - "A" Camshaft Position Actuator Control Circuit Low Bank 1
P0245 - Turbocharger/Supercharger Wastegate Solenoid "A" Low
P0458 - Evaporative Emission System Purge Control Valve Circuit Low

OBD2 - pending:
P2008 - Intake Manifold Runner Control Circuit/Open Bank 1
P0010 - "A" Camshaft Position Actuator Circuit/Open Bank 1
P0243 - Turbocharger/Supercharger Wastegate Solenoid "A"
P0444 - Evaporative Emission System Purge Control Valve Circuit Open
P2400 - Evaporative Emission System Leak Detection Pump Control Circuit/Open
P2401 - Evaporative Emission System Leak Detection Pump Control Circuit Low
P2009 - Intake Manifold Runner Control Circuit Low Bank 1
P2088 - "A" Camshaft Position Actuator Control Circuit Low Bank 1
P0245 - Turbocharger/Supercharger Wastegate Solenoid "A" Low
P0458 - Evaporative Emission System Purge Control Valve Circuit Low

OBD2 - permanent:
P0299 - Turbocharger/Supercharger "A" Underboost Condition
P2009 - Intake Manifold Runner Control Circuit Low Bank 1
P2088 - "A" Camshaft Position Actuator Control Circuit Low Bank 1
P0245 - Turbocharger/Supercharger Wastegate Solenoid "A" Low

[pahoynaas]

Did you ever get this solved??? I am stumped and I literally have the EXACT same set of codes!!! Any help is appreciated!!

[jbeckford1]

Did you ever get this solved??? I am stumped and I literally have the EXACT same set of codes!!! Any help is appreciated!!

I did not get it figured per-se. Sold her in 2019. Not sure if you have a oil leak but that was ultimately the killer. The front main seal was leaking which saturated the acc belt and macho me tried to muscle the car 4 miles home on battery power when it literally ate the belt through the crankshaft pulley opening. Instantly killed engine with timing jumping!

so while pulling off front cover to look at my handiwork, i noticed a small sensor wire near the crankshaft pulley which (if my rusty memory is right) was inline with the other camshaft “valve” i replaced. in-line as in used the same fuse that kept blowing. and yeah, that plug was full of fresh oil from what was the front main seal.
*maybe crank position sensor, idk.

hands down i loved this car the most of all i’ve owned. hope this helps you enjoy yours!