pcv smoke?

[CELison]

As of last night I have white smoke (which I assume is burning oil) coming out of my exhaust when the car is in high vaccum, most noticeable when engine braking over 4k rpm. If you rev it to ~4k rpm there is no smoke, past ~4k rpm it will smoke a little as the rpms drop. There is no smoke in boost or idle. The car drives fine otherwise. I thought valve stem seals, but there is no puff of blue smoke on start up after sitting all night. Coolant is pink and is at the same level. There is just enough smoke to notice is from the driver side mirror. Not a ton by any means. I'm thinking spider hose as it has never been replaced as far as I know. Any suggestions would be great. I'm leaving to go back to psu friday and would like the car healthy for h20.

Thanks
Jesse

[4ringsa6]

Leave the oil cap open and try to rev it and see if the smoke is still there. Leaving it open should eliminate PCV because the pressure is going out of the cap.

[CELison]

Leave the oil cap open and try to rev it and see if the smoke is still there. Leaving it open should eliminate PCV because the pressure is going out of the cap.

will do

[estoniancartel]

Damn, now you have it too! I'm sorry

[MTV2002]

i have the same issue, i removed my spider hose and added a catch can but it still does it, only after boosting on decel. its been an odd issue ive been trying to figure out.

[CELison]

There is no oil in the exhaust either so it's definitely being burned in the combustion chamber.

[CELison]

still having this issue. about to burn the car. I removed the oil cap and it still does it. maybe rings? smoke is only on decel though

[MDJ]

Oil will get past bad rings on deceleration.

Record compression for each cylinder after you've let the car cool off for a little while. Then, squirt a little oil into each cylinder and take compression again. If you have a higher reading on a cylinder, there's your problem. The oil will help temporarily seal the rings for the second compression test.

[CELison]

Leave the oil cap open and try to rev it and see if the smoke is still there.

It doesn't smoke when I rev it up. I did pull the cap and engine break in 1st and it smoked. It only smokes when decelerating from over 4k. I thought valve stems seals but when i start the car even after sitting for days there is no puff of smoke or anything on startup like there usually is with bad valve stem seals

[greg@dubaudi]

Anyone have a answer for this. Im having the same issue, and I had the same issue before I pulled the motor and did heads and rods. I have a new PVC set up with a catch can and still have the issue. Does meth coming on to early in boost have anything to do with it? Its driving me crazy and I only get it when on deceleration and coasting under vacuum. I get it a more when after a WOT pull.

[AudiTechS4]

just vent the breather hose and see what happens and plug the y pipe

[greg@dubaudi]

just vent the breather hose and see what happens and plug the y pipe

Did that and still smokes, not as bad. I just don't get it.

[Shhmaudi]

bump
Was it the turbos?

[Steve Bassen]

bump
Was it the turbos?

Interested in this as well... I've got the same symptoms on my fully built 2.7T swapped B6 and I'm leaning towards it being a bad set of china turbos since the PCV (upgraded hoses running through a Provent to the factory Y, and the revised oil cap that does pressure relief) should be working ok...

[CELison]

''Twas the turbos

[harryn]

man, mine was smoking like a chimney then cleared up... I replaced the turbos, still smoking. But the pipes were all full of oil!! Cleaned everything out, new lines, hoses, gaskets, etc. Still smoking like a mugger. I opened the oil cap, no smoke. I vented the breather hose, still smoke. You guys are lucky it was your turbos. I have new ones in mine, Borg Warner K03s, smoking like mad. Ugh. It has gone down considerably since the first start up, but the smoke is bothering me.

[Shhmaudi]

As of last night I have white smoke (which I assume is burning oil) coming out of my exhaust when the car is in high vaccum, most noticeable when engine braking over 4k rpm. If you rev it to ~4k rpm there is no smoke, past ~4k rpm it will smoke a little as the rpms drop. There is no smoke in boost or idle. The car drives fine otherwise. I thought valve stem seals, but there is no puff of blue smoke on start up after sitting all night. Coolant is pink and is at the same level. There is just enough smoke to notice is from the driver side mirror. Not a ton by any means. I'm thinking spider hose as it has never been replaced as far as I know. Any suggestions would be great.

FTR, Mine is doing the same exact shit, right around 30k "fun" miles on mine. I did a compression test and looked good across the board. Performed a leak down to check out the valve stem seals/ point me in the right direction. Everything checked out..

[harryn]

FTR, Mine is doing the same exact shit, right around 30k "fun" miles on mine. I did a compression test and looked good across the board. Performed a leak down to check out the valve stem seals/ point me in the right direction. Everything checked out..

I think your problem might be a vacuum leak somewhere else. Have you opened the cap and seen any smoke while it is running? Mine is smoking on and off throttle. :( I should do a compression test. I swear if all cylinders check out, then I am absolutely lost. All vacuum leaks have been taken care of, new hoses and clamps. I don't know what else.

[christianb5s4]

I have this issue, it's my turbos. Had a compression and leakdown done, everything was perfect. I have oil residue in the exhaust so it's not getting burned in the combustion chamber but in the exhaust indicating a turbo seal issue.

Harry, have you triple checked the turbos are fine? Decelerating in gear draws high vacuum which will pull oil through a weak seal in the exhaust side of a turbo.

[blitz2190]

to those with catch cans, or high flowing pcv systems, now that the weather is getting colder you'll find a lot more condensation in the system and it can cause some white smoke when it gets sucked in. check the can or inside of the spider hose and see if you see "milky" oil

[oppositelock]

I have this issue, it's my turbos.

SRM K24s, right? How many miles did you get out of them before they started smoking?

[jaychen]

SRM K24s, right? How many miles did you get out of them before they started smoking?

He's running custom RS6 rebuilt by CompTurbo if im not mistaken.

[harryn]

I have this issue, it's my turbos. Had a compression and leakdown done, everything was perfect. I have oil residue in the exhaust so it's not getting burned in the combustion chamber but in the exhaust indicating a turbo seal issue.

Harry, have you triple checked the turbos are fine? Decelerating in gear draws high vacuum which will pull oil through a weak seal in the exhaust side of a turbo.

I have brand new turbos. Put brand new seals (exhaust and inlet pipes) and gaskets, oil lines, washers, vacuum lines, the whole nine yards. I primed them before starting with fresh clean oil (cleaned the oil pan, new RTV sealant on the lower pan after cleaning everything up). No dentist drill sounds when lightly revving, oil cap opens easily, no smoke coming out. I have not done a compression check yet. I am hoping that is not the culprit. I don't want to pull the subframe out and align it again. :( I don't have any help, but myself. Ooof...

[christianb5s4]

Not SRM K24s, custom built turbos by Compturbo (awful place, I had a very bad experience). Only got 1000 miles out of them before the driver's side turbo started making dentist drill sounds past 10psi. I'm switching to SRM K24s actually.

[blitz2190]

I have brand new turbos. Put brand new seals (exhaust and inlet pipes) and gaskets, oil lines, washers, vacuum lines, the whole nine yards. I primed them before starting with fresh clean oil (cleaned the oil pan, new RTV sealant on the lower pan after cleaning everything up). No dentist drill sounds when lightly revving, oil cap opens easily, no smoke coming out. I have not done a compression check yet. I am hoping that is not the culprit. I don't want to pull the subframe out and align it again. :( I don't have any help, but myself. Ooof...

why not just pull the engine out the front?

[harryn]

why not just pull the engine out the front?

I wanted to do that, but a local "Audi" guy told me that it is harder to do it that way. Not claiming to be a mechanic on VW/Audi cars, since I mainly do BMWs, but I figured it would be fine to just drop it onto my jack, raise the car, and pull it out. I didn't know about the alignment part when re-installing everything again, but now I do.

But anyway, how far-fetched of an idea would it be if oil could be caked up on the catalytic converters? And if it is indeed the culprit, how long would it take to clean all of that out? The smoke has started dying down considerably, and oil level is still the same. I may just yank out the intercoolers again, just to verify I don't have a small Saudi Arabian oil reserve in there.

[blitz2190]

I wanted to do that, but a local "Audi" guy told me that it is harder to do it that way. Not claiming to be a mechanic on VW/Audi cars, since I mainly do BMWs, but I figured it would be fine to just drop it onto my jack, raise the car, and pull it out. I didn't know about the alignment part when re-installing everything again, but now I do.

But anyway, how far-fetched of an idea would it be if oil could be caked up on the catalytic converters? And if it is indeed the culprit, how long would it take to clean all of that out? The smoke has started dying down considerably, and oil level is still the same. I may just yank out the intercoolers again, just to verify I don't have a small Saudi Arabian oil reserve in there.

if its a manual its not that hard to pull the downpipes with it in the car, if its auto its easier to pull the engine , damn autos are huge.

[harryn]

Well, I found the source of my smoke problem by taking it to my mechanic friend's shop, and stop listening to the local "Audi" guy... I think after this post, I am going to give up my Audi ownership card...

Saturday morning, I walk into my friend's shop, my S4 on the lift... and oil spots on the ground. Weird part was, oil was dripping from the length of the exhaust. We both looked a bit shocked, my friend especially. I then pulled the intake tubes out from the TB, the driver's side, dry. The Passenger side? Saudi Arabia made a new oil field. OIL everywhere! I removed my new silicone tube from the SMIC on the passenger side, and it just GUSHED out oil. A LOT of oil. I let it drain for a good wile, cleaned up what I could, re-assembled. At this point I was about to give up. It wasn't until my mechanic friend asked me to check the oil return line and make sure it wasn't clogged. I figured, why not, gotta remove the engine anyway if the turbos are blown. I removed the two 5 mm allen bolts from the turbo, and holy cow. I forgot to remove the plug when I installed the new line. After I saw that, my friend cheering that it wasn't a huge issue, I felt that I can't own an Audi after that debacle.

Anyways, Suffice to say, still burning off the remnants of the oil in the exhaust. Car is not legal yet (not inspected, no insurance, haven't even transferred the title yet) to drive on the regular roads, so I just drive it up and down the hill in front of my friend's shop. On evenings when roads are clear and no cops, I drive it a bit longer. Smoke has dwindled a ton now. Ugh... I won't even begin to tell you what caused the G163 code... I feel so stupid, even now.

[roboto_1337]

Rule of thumb... white smoke = coolant or condensation in exhaust.

Blue/black smoke = oil

I would guess head gasket... but could be many things. When you change your oil it'll be milky if the coolant is mixing with the oil...

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[Teck09]

Rule of thumb... white smoke = coolant or condensation in exhaust.

Blue/black smoke = oil

I would guess head gasket... but could be many things. When you change your oil it'll be milky if the coolant is mixing with the oil...

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I'll play. I would guess the turbo oil drain line was plugged.....

[roboto_1337]

Lol


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[harryn]

I'll play. I would guess the turbo oil drain line was plugged.....

LOL! Wait till I tell you about my G163 code... I forgot to tighten the 13mm bolt for the spinning disc, after getting ready to rip out the wiring and start tracing for cracks in wiring or shorting. The spinning disc inside the cam position sensor was getting caught on the sensor's probe and wasn't spinning. Now I gotta check the passenger side today.

Is there an Audi Darwin award? I'll nominate myself.