2010 A4 2.0T - oil smoke

[vtraudt]

Observed Symptoms of smoke from tail pipe from oil burning (roughly one quart per gas tank, so 2+ quarts/1k mls):

1) Only smokes with warm engine
2) Does NOT smoke under boost
3) Does NOT smoke under constant part throttle (or not noticed)
4) Smokes when closing throttle (vacuum), and coming to a stop
5) Smokes when closing throttle, then opening again or tapping
6) Smokes when heavily ‘stabbing’ the throttle, revving engine (open throttle wide, revs up, closing throttle)

Currently, PCV system lines to engine block and intake manifold are vented to atmosphere (blocked intake side). It feels like smoking was reduced after venting to atmosphere.

What could cause the smoke under the above conditions?

I know that the 2.0T (not sure if this generation or the next) is suffering from high oil consumption do to wrong oil piston ring design, but have never read that SMOKING is a symptom.

The head was completely rebuilt by engine shop after timing jump (bent valves).
No cat (downpipe), removed when head was out.
I installed a new turbo when head was out.
I do NOT know if engine was smoking prior to timing jump.
I have tried some 'soaking', chemicals in oil, chemicals in gas.

[wkhanna]

i doubt they re-ringed the pistons during the valve repair.
maybe try replacing the PCV. it helped mine.





Sent from the land of archaic anachronisms

[vtraudt]

i doubt they re-ringed the pistons during the valve repair.
maybe try replacing the PCV. it helped mine.
Sent from the land of archaic anachronisms

I did not take the engine apart, so most certainly not 're ringed'.
PCV: that is why i 'disabled' the pcv. Hose coming up from block in the PCV vents to atmosphere, corroguated hose going from PCV to intake removed, intake hole blocked. Both vent to atmosphere currently.

[wkhanna]

understood, but I'm not sure it's necessarily to be 'atmospheric'.?
if it's malfunctioning it may best to try and replacing it. they aren't expensive and it's a fairly easy job DIY.





Sent from the land of archaic anachronisms

[vtraudt]

understood, but I'm not sure it's necessarily to be 'atmospheric'.?
if it's malfunctioning it may best to try and replacing it. they aren't expensive and it's a fairly easy job DIY.

'venting to atmosphere' basically means diabling and bypassing the PCV to rule out that it my pressurize the engine block (crankase or valve) and/or spitting 'bad stuff' back into the intake/turbo/cylinder to burn.
I think they sell (big time $$$ IIRC) "PCV Delete" kits.

[vtraudt]

This 'pcv delete' still has a connection from 'factory breather tube going to the turbo inlet'. They don't show photos from the bottom, but I assume they just 'channel' the crank breather tube and the valve cover opening to the in/out connection (going to/coming from external catch can).

This part features internally-channeled construction, and connects directly to the factory breather tube going to the turbo inlet.

The Valve Cover Breather Adapter eliminates the breather provision on the intake manifold, eliminating a common source for a boost leak, and preventing oil from entering the intake manifold and contributing to carbon buildup.

https://www.ecstuning.com/b-034motor...UaApk9EALw_wcB