i recently popped my standard kkk turbo on my fabia so ive bought a 150pd hybrid. ive done compressions tests and all is ok, the car isnt using any oil or using any water but it is chucking out loads of white smoke when decelerating or when pulling off and changing gear. now my car isnt mapped yet to run this turbo but it has a awesome gti generic map on at the moment but i cant see this being the cause for my smoke screen! just waiting for somebody to pop out and say "TONIGHT MATTHEW, IM GOING TO BE!"

At the same time as the new turbo i fitted a egr delete and removed the anti stutter valve aswel. does anybody have any ideas on what could be causing this?

makes me want to take a lighter and a can of petrol to the stupid thing!!!

Thanks in advance!

what is it running like?

PCV Valve?

runs absoluterly fine other than the smoke. and whats a pcv valve?

The blowby vapors that end up in an engine's crankcase contain moisture as well as combustion byproducts and unburned fuel vapors. The crankcase is sealed to prevent the escape of these gases into the atmosphere, but the vapors must be removed to prevent oil contamination that leads to sludge formation. The positive crankcase ventilation (PCV) system siphons these vapors from the crankcase and routes them into the intake manifold so they can be reburned in the engine.

The main component in the PCV system is the PCV valve, which is usually located in the valve cover. A hose connects the PCV valve to the intake manifold. A second hose between the air cleaner and crankcase or other valve cover (V6 or V8 applications) provides fresh air to help flush the vapors out of the crankcase. Some engines have a separate air filter for the PCV breather hose located inside the air cleaner.

The PCV valve is a spring-loaded valve with a specific orifice size designed to restrict the amount of air that's siphoned from the crankcase into the intake manifold. This is necessary because air drawn through the valve from the crankcase has a leaning effect on the fuel mixture much the same as a vacuum leak. So air flow through the valve must be controlled within certain limits. At idle, air flow is reduced because little blowby is produced. When the engine is cruising and vacuum is high, airflow through the PCV valve is at a maximum to purge the blowby vapors from the crankcase.

You sure it's not using any oil?

I ask this purely because the oil would seep past the seals at those times.

Did they replace the turbo feed pipes when the turbo was changed (not that it will cause smoke) and also did they prime the turbo with oil before starting the car up, so that it had oil in when it first spun up?

I'd say there is a possibility of a duff turbo if it's smoking that much. I'd check the PCV valve first, but do it quickly enough that you can still talk to the retailer of the turbo if you need to.

Another option is that the IC pipework was full of oil and this is being pushed through by the turbo now, into the engine and being burned.

Edited 31 July, 201213 yr by cheezemonkhai

Take a look at this article http://www.dieselsmoke.com.au/ it says that White Smoke on a diesel is unburned fuel.

Another guide here http://www.uniteddiesel.co.uk/diesel-engine-smoke.php

Paul

ahh ill check the pcv 2morow as ive had all this on and off a few times, and me and a mate done all the work on the car. (he's a fully qaulified technition) i replaced the oil feel and return and we did prime the turbo correctly. ive had a few people say the vacuum pipes, doesnt make a difference what i do with them so im ruling them out. car is perfect on the compression test, possible injector? maybe? does anybody know if there is a way to check the volume the injectors are injecting? i know on toyotas its possible with the tester (im a toyota service advisor) and you can see if there injecting to much or to little fuel.

ive only done about 60miles in the car since putting it all back together and its not used any oil or water in that time. i know its not very far but its exactly bang on where they where when i started the car for the first time.

somebody has also said to check the maf sensor but again how do you check that? i have vagcom light on my laptop so i can read the figures and codes but cant adjust anything.

Thanks for the advice aswel guys.

One thing I have just realised....

If you've got a map requesting extra fuel and have now added a hybrid that's going to be capable of ramming more in, that could really mess up the fueling ratios, depending on how the turbo actuator is being pulled/pushed and also how the boost is created by the new hybrid.

Worth getting the standard map put back on until you can get it mapped properly?

White smoke isn't unburnt fuel so unlikely to be the MAF at fault or the cars mapping requesting the wrong ammounts of fuel etc.

White smoke would indicate oil being burnt to me.

Phil

White smoke isn't unburnt fuel so unlikely to be the MAF at fault or the cars mapping requesting the wrong ammounts of fuel etc.

White smoke would indicate oil being burnt to me.

Phil

Oil smoke is blue, white smoke can be water, white smoke that smells of diesel can be injectors

vrsiain I've replied to your other thread in the Fab section

yeah white is fuel or water. i cant see the map thats on the car being the cause for this smoke, i know it wont be helping but its alot of smoke coming out and other than that the car is running good. im going to check a few things that i can myself and if i get no luck ill pay my local vw specialist to have a crack at it.

right, ive just been out to the car with my laptop to log the maf. ive logged it just sitting still and holding the revs at 3000rpm and then driving the car in 3rd from tickover to 3000rpm then 3000rpm to 4500rpm. can anybody make any sense of the log and tell me if anything is wrong?

maf driving.csv 1.23K 0 downloads maf.csv 2.1K 0 downloads

Thanks