Black/Grey smoke-Audi 2.0 tdi 140

[Blue Bob]

Hi guys,

Hope you can help me with a problem that has been bugging me for a while on the audi A4 55 plate blb engine code.

Ive been getting a small amount of white smoke on cold startup and large amounts of black/grey smoke on aceleration, The car also has a bit of vibration in the seats...like a small judder at idle, idle's fine btw and does not miss and is not rough.

It doesnt smoke when cruising it smokes after slowing down and pulling away again.

Check emission light came on and vag reader said it was faulty MAF, code P0101 and cylinder 4 glow plug circuit p0674

We replaced the maf but still smoked exactly the samee and after 80 miles check emission light is back on with fault P0101 and im not sure where to turn next as ive only had the car 3 weeks and cant afford to throw money at things that may or may not fix it.

Want to add that there is no rattle from engine so have ruled out DMF for the engine vibration/shudder.

Many thanks for looking and any help is greatly appreciated.

Edited by Blue Bob on Sunday 14th August 21:13

[Blue Bob]

Noticed a new problem today and an update on the maf p0101 code.

The P0101 code is back like i said above but this time it is saying "implausible signal" before it said "Range performance"

New problem i noticed is that oil is coming out of the oil cap and if i take off the cap with engine running it give's a long hiss and puffs out smoke, it also puffs out smoke from the dipstick if it is pulled out when running.

There is also a oily gundge at the bottom of the big rubber hose that connects to the MAF

Any help on these problems would be great, Also does Tame Technicain still post here as from what i can remember he knows his stuff with Audis

Cheers, Bob

[00161wj]

Sounds like a boost leak. Is it an A6? If so check the intercooler.

[Blue Bob]

Yeah its an A4, have updated original post.

I was also thinking boost leak but what would be causing the oil coming from the oil cap?

Thanks for the reply

[Nors]

Blue Bob said:

New problem i noticed is that oil is coming out of the oil cap and if i take off the cap with engine running it give's a long hiss and puffs out smoke, it also puffs out smoke from the dipstick if it is pulled out when running.

There is also a oily gundge at the bottom of the big rubber hose that connects to the MAF

Any help on these problems would be great, Also does Tame Technicain still post here as from what i can remember he knows his stuff with Audis

Cheers, Bob

This problem was common on early 2.5 tdi engines and was caused by a blocked Crankcase Filter. This caused the Crankcase to pressurise and force oil up through the inlet manifold and burn the oil. The way to check this was to turn the oil cap or pull out the dipstick when the engine was hot. If it "hissed", then the Crankcase Filter was blocked. Audi replaced this later with a modded one.


This will push oil all over the engine!

Never heard of this problem in a 2.0tdi four pot though, but it does sound like your getting a build up of pressure in the Crankcase!

[Rizzya6]

Hi there guys i have an issue with me audi 2.0tdi BRE theirs a slight engine wobble while i am stationary have no idea why it does this .. its pulls in every gear starts first time when its cold it will wobble quite a bit but soon as the temperature gets to the middle it starts to calm down but still wobbles slightly