Insane oil consumption after PCV Valve Fix

[a1dan_87]

So recently I replaced the PCV valve in a family members 2007 Audi a4 avant quattro 2.0tfsi

We noticed that after he went on a drive for a few hours to a soccer game, the oil light came on. We filled the car to about half, deciding to keep an eye on it.

That was on Sunday, and the car has done about 175 miles and the oil light is back, and the car is down to minimum. It had been consuming some oil before I replaced the PCV, but now practically 2 quarts every 200 miles is insane. We haven't noticed any leaks on the driveway where it is always parked, or any blue/white/black smoke.

Valve gasget and PCV valve have been replaced in the last 6 months, any idea what this could be? I will be keeping a close eye on the car and it's driving habits, and will be updating this thread. No check engine lights, however before the codes went away after valve replacement it started this (volume turned to 250%): https://youtu.be/WeDxdtlrbMU

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[Low and Behold]

I can’t hear the video, but I would advise removing/inspecting the underside of the valve cover next. It might be sucking oil straight out of the crank case. When the oil light comes on, it means you’re down 1qt., so make sure to add a FULL quart and see.


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[blauslc92]

The video sort of sounds like a muffled version of when the vacuum pump hose fitting is loose.
See the following thread. Look way down someone posted a video from the engine bay.

Finally found the problem !!!
https://r.tapatalk.com/shareLink?sha...0&share_type=t


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[flowhigh]

Better check those intercooler pipes

Get enough oil in them and it's a no no

[dalmation53]

The video sort of sounds like a muffled version of when the vacuum pump hose fitting is loose.
See the following thread. Look way down someone posted a video from the engine bay.

Finally found the problem !!!
https://r.tapatalk.com/shareLink?sha...0&share_type=t


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Damn you beat me to it. I was going to say the same.

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[EvolutionArmory]

Make absolutely sure you bought the right combo of PCV parts. Early B7’s take a different combo than late.

One combo has the check valve in the valve and an empty turbo breather tube

The other combo has no check valve in the valve and places the check valve in the turbo breather tube.

Check to make sure you have the right combo for your VIN range. You don’t want to have 2 check valves, no check valves or the wrong combo. It’s an easy mistake to make and even easier to check.

[Theiceman]

I concur with ALL above .

1. make sure you used the right PCV parts for your car
2. Check underside of valve cover for separation of the chamber inside the cover , or make sure the pathway through the valve cover can hold air ( do a search for this )

that noise is VERY concerning . It a MUCH heavier noise than the loose vacuum pump fitting. Sounds like bottom end but we would need a vid from the engine bay.

[a1dan_87]

I concur with ALL above .

1. make sure you used the right PCV parts for your car
2. Check underside of valve cover for separation of the chamber inside the cover , or make sure the pathway through the valve cover can hold air ( do a search for this )

that noise is VERY concerning . It a MUCH heavier noise than the loose vacuum pump fitting. Sounds like bottom end but we would need a vid from the engine bay.

You can hardly hear it from the engine bay, I will get a video of the car from the outside later when its cooled off and i'm at home. The mic doesn't pick it up well from inside the car so I had to turn it up to 250% in the video above. It is quite heavy of a noise in person. Like I said I will get a video of the engine bay later tonight, but its barely audible above the normal FSI/ticking/fuel rail noises (so ive heard them called)

[a1dan_87]

The video sort of sounds like a muffled version of when the vacuum pump hose fitting is loose.
See the following thread. Look way down someone posted a video from the engine bay.

Finally found the problem !!!
https://r.tapatalk.com/shareLink?sha...0&share_type=t


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seems like that might be it! Ill check the car in about 20 minutes before we start it (stupid school). That seems like it could be it. also, after replacing the pcv, one of the clamps on the crankcase breather hose snapped off, but it still has 1 and we dont want to have to take off the intake manifold to replace the damn thing.

the noise is definitely heavy at the back of the engine (where the hose is), which would explain the second clip in the video I added- where when I lift my phone over the dash, the noise gets significantly louder just under/in front of the dash, and why It cant be heard from outside the car easily.

[80sGuy]

Damn, that sounded like a black hawk chopper. Anyway, the part should be something like this as I had the PCV recall done by Audi a few years back:
PCV Valve & Gasket - 06F 129 101 P, 06F 103 483 E
PCV Breather Tube (aka Turbo Inlet) - 06D 103 215A. This part MUST be updated/installed with the corresponding part(s) above!

[Theiceman]

the vacuum pump is a clicking sound. I thought this sounded heavier but hope that's it as its an easy fix,

[a1dan_87]

Less oil consumption that I originally thought in numbers possibly. Not exactly sure the capacity of the car (I read it to be around 4.6 liters total oil capacity) but we had it filled to exactly the halfway mark with oil on Sunday.
It hit minimum last night plus the oil light, and we filled it to 'MAX' with the properly specified oil today. We also reset the trip computer(?) to monitor how many miles it'll go before the oil light is back (come on, having to use the trip computer(?) to monitor OIL consumption, not gas)

Keeping a close eye on it. As I said, no leaks on the driveway in its parking spot (aside from a very, very slow leak of something not seeming to be oil? Especially not the amount the car is losing). I will keep the thread updated, I am not the owner of the car (owners parents home soon) and Ill be finding out what we are going to be trying next. I am an amateur mechanic by far, and piston rings or any associated problems (bottom end included with that knocking noise) is far beyond the realm of my skills.

[Theiceman]

well you can have a quick look at your exhaust pipes. If they are black and coked up you have a burner. I am using a quart every 180 miles so my car is parked until I investigate further.
looks like I am going to pull the engine over the winter.

[joepickems]

What did your son do now to the car?

well you can have a quick look at your exhaust pipes. If they are black and coked up you have a burner. I am using a quart every 180 miles so my car is parked until I investigate further.
looks like I am going to pull the engine over the winter.

[a1dan_87]

Slowly putting miles on the car to get an exact reading on how quickly it goes through oil.

What is the capacity in the car, 'Min-max' on the dipstick?

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[80sGuy]

Always top your oil level at MAX and keep an eye on it.

[80sGuy]

Less oil consumption that I originally thought in numbers possibly. Not exactly sure the capacity of the car (I read it to be around 4.6 liters total oil capacity) but we had it filled to exactly the halfway mark with oil on Sunday.
It hit minimum last night plus the oil light, and we filled it to 'MAX' with the properly specified oil today. We also reset the trip computer(?) to monitor how many miles it'll go before the oil light is back (come on, having to use the trip computer(?) to monitor OIL consumption, not gas)

Keeping a close eye on it. As I said, no leaks on the driveway in its parking spot (aside from a very, very slow leak of something not seeming to be oil? Especially not the amount the car is losing). I will keep the thread updated, I am not the owner of the car (owners parents home soon) and Ill be finding out what we are going to be trying next. I am an amateur mechanic by far, and piston rings or any associated problems (bottom end included with that knocking noise) is far beyond the realm of my skills.

If you're burning (or losing) that much oil in such little time/distance than there is definitely something wrong. Yes, Audi calls for 4.5 quarts on 2.0 engines

[Theiceman]

What did your son do now to the car?

Actually my ( his) B7 is running great. I picked up a B 8.5 which has been a bit of a disaster. I will be rebuilding the engine over the winter.
I must have got confused on the forums as burning oil is a huge complaint on B8 forum

It needs pistons and rings.

[wding2000]

What is the capacity in the car, 'Min-max' on the dipstick?

Min-Max is 1 Qt

[Theiceman]

Min-Max is 1 Qt

total capacity I believe is 4.7 litres with filter. dip stick only monitors the top litre

[a1dan_87]

If you're burning (or losing) that much oil in such little time/distance than there is definitely something wrong. Yes, Audi calls for 4.5 quarts on 2.0 engines

Welp! Update:

I guess we found what was wrong. Pulling onto the highway, the car went up in blue smoke and we lost severe amounts of power. It looks like the turbo went? (no spilled oil, tons of acrid blue smoke and power drop off. Car still seemed to run, managed to get it home without calling triple A)

We are thinking its the turbo. Got the car home with a check engine light on, will update soon with the code it reads.

Our father drove it home, supposedly the turbo was pretty loud and the car would go up in smoke generally above 2250RPM
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[a1dan_87]

Better check those intercooler pipes

Get enough oil in them and it's a no no

Aaaah famous last words. Eventually pulled the car apart, and of course a few cups came out of the interxoolers. Would I need to clean or replace them? (You can see all the fins are soaked)

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[a1dan_87]

well you can have a quick look at your exhaust pipes. If they are black and coked up you have a burner. I am using a quart every 180 miles so my car is parked until I investigate further.
looks like I am going to pull the engine over the winter.

Also as I had pulled it into the garage a few months ago to start disassembly, oil was visibly shooting out the exhaust in DROPLETS.

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[Theiceman]

so what happened ??? that was 3 months between posts

[Brillo]

so what happened ??? that was 3 months between posts

I was wondering about this one too. Kinda frustrating to read about or assist on these type of threads and not hear the end result. I guess his TC bearings and seals went south which allowed oil to get pumped into both the turbine and compressor side, compressor side allowed oil into the intercooler/intake system and out the exhaust through the turbine side.

[Brillo]

We're long overdue in getting these oil pressure, oil consumption, PCV system, valve cover issues nailed down.

[Theiceman]

too many leaches come in for help then vanish.. if people did follow up we would have a much better fix rate and quicker as we collectively build our knowledge. ..

[Brillo]

too many leaches come in for help then vanish.. if people did follow up we would have a much better fix rate and quicker as we collectively build our knowledge. ..

Exactly!

[a1dan_87]

too many leaches come in for help then vanish.. if people did follow up we would have a much better fix rate and quicker as we collectively build our knowledge. ..

Sorry guys!

The car has sat since I made the post, because assigning the job of finding the part to the car owner (an 18 year old kid, mechanically dead) while he has a loaner takes a while. We just got the turbo this week, so I honestly didn't have a way or reason to "follow up" or post more. Got the turbo out of the car the same week of it going up in smoke, but the car had sat since October in peices.

The turbo has been replaced! As of 30 minutes ago the car runs and drives once again, no more exhaust smoke or anything of the sort!

No tabs or numbers yet on oil consumption, but once we confirm the car is stable and fluids are topped off, we're going to start daily'ing it again and track oil consumption from there.

Also keeping an eye on the valve cover, if oil consumption doesn't change that'll single out the issue.


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[a1dan_87]

I was wondering about this one too. Kinda frustrating to read about or assist on these type of threads and not hear the end result. I guess his TC bearings and seals went south which allowed oil to get pumped into both the turbine and compressor side, compressor side allowed oil into the intercooler/intake system and out the exhaust through the turbine side.

Honestly not sure. I'm hoping the oil got where it got exclusively because of the turbo, and not because of a cracked VC. Im beyond thoughts until we track oil consumption for a week or so from this point.

New turbo is in, car runs and drives better than before!

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[griga]

too many leaches come in for help then vanish.. if people did follow up we would have a much better fix rate and quicker as we collectively build our knowledge. ..

not that i care if this involves me, but i made a thread looking for oil consumption help but have yet to update it since i haven’t had the time to do much work on the car. will be updated once i get the chance to test a few things. just thought i’d clear it up because i’m more than happy to help people solve these issues. noobs like me do exist haha


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[griga]

that being said, this gives me relief to my issue most likely not being turbo related. glad everything seems to be sorted out.


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[Theiceman]

yeah in general too much communication is always better than not enough ...
i wont update for a while, waiting for parts.......

[Brillo]

not that i care if this involves me, but i made a thread looking for oil consumption help but have yet to update it since i haven’t had the time to do much work on the car. will be updated once i get the chance to test a few things. just thought i’d clear it up because i’m more than happy to help people solve these issues. noobs like me do exist haha


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OK, thanks griga, we'll look forward to hearing whether the new TC fixed the problem. I will tell you though that the VC leak test is really pretty easy to do.

[a1dan_87]

that being said, this gives me relief to my issue most likely not being turbo related. glad everything seems to be sorted out.


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Id hope it isnt turbo related! Ill keep updating on the situation with ours as we start driving it. My biggest thing to watch is oil consumption.

If its abnormal, im going to push to have it garaged again before the new turbo drowns in oil.

ALSO, IF ANYONE IS INTERESTED: I had started a new thread on my journey through doing the turbo DIY. I can say, at 15 years old, NOT an experience I was prepared for. Link: https://www.audizine.com/forum/showthread.php?t=831674

[a1dan_87]

OK, thanks griga, we'll look forward to hearing whether the new TC fixed the problem. I will tell you though that the VC leak test is really pretty easy to do.

Also, VC leak test? How would one go about doing that? Let me know, its definitely something I need to do. PM or a reply here is good, help is appreciated.

[griga]

https://www.audizine.com/forum/showthread.php?t=827524

he posts about it here


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[griga]

i would’ve done this by now but i just haven’t figured the best way of going about it.

[Brillo]

Also, VC leak test? How would one go about doing that? Let me know, its definitely something I need to do. PM or a reply here is good, help is appreciated.

Very easy to do without removing the VC. Carefully remove the PCV valve. This exposes the left front port which goes through the secret passageway in the VC to the breather port on the other (right) side of the VC. Remove the breather tube (larger diameter, not the smaller one) from the right front of the VC. This is the breather tube that goes down to the pre-TC port. (Make sure you have a proper hose clamp to reattach the breather tube.) Now block off one of the two aforementioned openings in the VC with a cork or rubber stopper of some kind. Now pressurize or evacuate from the other port. You can use any source of pressure such as a pressure brake bleeder, vacuum bleeder, or even a bicycle pump with an inflation needle sticking through another rubber cork. If there is a leak in the passageway which would allow ingress of oil, it will not be able to hold a vacuum or pressure. The leak will be apparent due to the immediate loss of pressure (vacuum). If it holds pressure, you're good - no leak. Reassemble breather and PCV valve being careful not to strip the PCV valve screw threads - easily done as you'll be screwing into plastic.

[griga]

Now block off one of the two aforementioned openings in the VC with a cork or rubber stopper of some kind.

I should have the chance to try this in the next week or so, but shouldn’t I block both sides and stick a needle through one? If i leave one side open it won’t hold pressure no matter what?