Lots of white smoke at W0T

**bugleg** · 10-24-2022 06:27 AM

When I give the car full throttle, getting on the highway Huge amounts of white smoke come out the tailpipe. Is that consistent with failing turbo seals or something else?

**Jayz691** · 10-24-2022 09:55 AM

Check your IC hoses for oil first. Could have a lot built up, and pushing into engine when on boost. If so, drain.

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**esandes** · 10-24-2022 09:29 PM

Jayz692 the audi messiah has spoken.

**bugleg** · 10-24-2022 09:41 PM

I found lots of oil in lower intercooler previously, but have replaced Pcv and valve cover. Is there something else I should be checking on?

**PhireSideZA** · 10-25-2022 05:05 AM

Originally Posted by bugleg

I found lots of oil in lower intercooler previously, but have replaced Pcv and valve cover. Is there something else I should be checking on?

Is your PCV and tube from VC to Turbocharger matched? There are different revisions, and either one of the two items will have a check valve in, but you can't run with no check valve or two check valves. If the PCV has a check valve, the breather tube isn't supposed to have one, and vice versa.

Other places of oil ingress into the IC piping could be tired turbo seals. How many miles on your car at present?

**Jayz691** · 10-25-2022 08:17 AM

Originally Posted by esandes

Jayz692 the audi messiah has spoken.

Are you in love with me or somethin?

. Much more helpful than your crap..

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**Jayz691** · 10-25-2022 08:19 AM

Originally Posted by bugleg

I found lots of oil in lower intercooler previously, but have replaced Pcv and valve cover. Is there something else I should be checking on?

Still worth a look. Was the VC a new genuine one? Have recently seen new Febi/Vaico VC's fail after a few months.

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**esandes** · 10-25-2022 09:31 PM

More jz spam.

I had oil consumption so bad from bad piston ring blowby I had oil splatter on my garage door.

**PhireSideZA** · 10-26-2022 12:30 AM

Originally Posted by esandes

More jz spam.

I had oil consumption so bad from bad piston ring blowby I had oil splatter on my garage door.

Heh, me as well. The rear side of my garage has a glass sliding door, and there are two neat black patches from the exhaust still. Did you do a compression test at all or was it the oil splatter and consumption that gave the issue away?

**Jayz691** · 10-26-2022 12:33 AM

Originally Posted by esandes

More jz spam.

I had oil consumption so bad from bad piston ring blowby I had oil splatter on my garage door.

And your point is?? You always start with the cheap/easy stuff, befire you jump to saying "Bad rINgs". All ya do is bitch, instead of actually helping. Typical, get off my nuts already weirdo..

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**Jayz691** · 10-26-2022 12:34 AM

Originally Posted by PhireSideZA

Heh, me as well. The rear side of my garage has a glass sliding door, and there are two neat black patches from the exhaust still. Did you do a compression test at all or was it the oil splatter and consumption that gave the issue away?

Comoression test won't tell you anything about the condition of your oil scraper rings. How did you verify? Have ya rebuilt it? Black exhaust "splatter" can be from carbon/condensation also..
And don't feed into his nonsense, hes the class clown here

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**PhireSideZA** · 10-26-2022 03:25 AM

Originally Posted by Jayz691

Comoression test won't tell you anything about the condition of your oil scraper rings. How did you verify? Have ya rebuilt it? Black exhaust "splatter" can be from carbon/condensation also..
And don't feed into his nonsense, hes the class clown here

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Was just information that I was wondering about if maybe bad oil scraper rings would maybe be indicative of bad compression rings at all.

My engine is currently in the shop for a rebuild. Oil pump balancer shafts seized, which deposited fragments into the oil that made its way to the head. So oil pump, head, cams, valves, seats, stem seals, pistons, rings, and all bearings are being replaced.

**Theiceman** · 10-26-2022 05:11 AM

It is not piston ring " blowby". That's a common term used by those who dont understand, and you will not get oil anywhere outside the car ..
....what is happening as pointed out is the oil scrapper rings have failed and become clogged and oil can not return through the holes in the piston and is therefore burned . There will be no blowby or lack of compression as the compression rings are fine ..
The oil that enters the combustion chamber is completely burned. You do not have oil exiting the combustion chamber or cat if you did car would stall as plug would be oil soaked.
What you have is the combustion chamber creating a ton of coke which lines the exhaust tract actually created by the cat for any unburned hydro carbons . The by product of combustion is water which carries the coke outside the tail pipe and spatters everything behind it. I have rebuilt several engines for this including my own..it is far more common on the b8..
The b7 it's possible but is not the number one culprit as mentioned . The b7 suffers from failed VC that is much more common.
Also oil on the IC piping is somewhat normal for a b7 and should be checked occasionally

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**Jayz691** · 10-26-2022 09:42 AM

Great explanation, its often confused. Only way to know if oil scrapers are clogged is a teardown. Ya see a lot of people get worried when they see wet black stuff coming out the exhaust. Its more common with people running hfc's and esp testpipes. But just carbon/moisture mix.

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**Theiceman** · 10-26-2022 11:12 AM

Originally Posted by Jayz691

Great explanation, its often confused. Only way to know if oil scrapers are clogged is a teardown. Ya see a lot of people get worried when they see wet black stuff coming out the exhaust. Its more common with people running hfc's and esp testpipes. But just carbon/moisture mix.

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sad but true .. this is the result of the teardown of which you speak ( My car )

**bugleg** · 10-27-2022 03:32 AM

Hmm. I don't think I did do the metal tube from the VC to the turbo.

Car has 140,000 miles. It's consumed a lot of oil since I got it, but was leaking from just about everywhere (filter housing, cooler, VC) so hard saying not knowing if I've got a turbo seal or piston issue...

I'll dig into the PCV and make sure I've got a matched set of tube and PCV

**bugleg** · 07-05-2023 11:07 AM

I replaced the metal tube to no effect.

Smoke is white, not black, and I've noticed the problem happens when heavy on throttle for prolonged period, headed up a hill on onramp at high load. I can 'feel' the engine loose power just before the smoke appears, and it resolves itself within a minute or so. If I take my foot off the throttle it dissipates.

Should I replace VC again?

**Jayz691** · 07-05-2023 03:23 PM

Originally Posted by bugleg

I replaced the metal tube to no effect.

Smoke is white, not black, and I've noticed the problem happens when heavy on throttle for prolonged period, headed up a hill on onramp at high load. I can 'feel' the engine loose power just before the smoke appears, and it resolves itself within a minute or so. If I take my foot off the throttle it dissipates.

Should I replace VC again?

What kind of VC did you get the first time. Test before replacing anything. Are your boost pipes full of oil again? Did it stop for a while, after draining.

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**bugleg** · 07-05-2023 04:59 PM

VC was Vaico/Loctite from FCP. What is the test?

Oil in the boost pipe every oil change, didn't get better after VC replacement.

**a4audi4fun** · 07-05-2023 05:32 PM

I always thought white smoke is coolant and bluish was oil but happy to be proven wrong

**Jayz691** · 07-05-2023 11:55 PM

Originally Posted by a4audi4fun

I always thought white smoke is coolant and bluish was oil but happy to be proven wrong

On older cars, without a car, yes. But with cars these days, with cars, things are dif. White smoke can also be raw fuel.

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**Jayz691** · 07-05-2023 11:59 PM

Originally Posted by bugleg

VC was Vaico/Loctite from FCP. What is the test?

Oil in the boost pipe every oil change, didn't get better after VC replacement.

Like a lot, or a little?
Ya wanna smoke test the channel for the PCV. Look for leaks, cracks, etc.

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**bugleg** · 07-06-2023 06:03 AM

About a pint.

Where's the best place to tap into PCV for smoke test?

**Jayz691** · 07-06-2023 09:54 AM

Originally Posted by bugleg

About a pint.

Where's the best place to tap into PCV for smoke test?

A point every oil change?? Yeah, thats a LOT.
Pull the VC off. Test the port that goes from front PCV, to rear breather. Block one side, pressurize with smoke, and look for leaks.
With that much oil, its gotta be either a cracked VC, or turbo seals.

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