Black smoke from Audi A4 19. TDI?

Question

Hi Guys, just bough myself a 96 (N) 1.9 Audi A4 TDI. When it gets upto 2000rpm a plume of black smoke comes out of the exhaust. I have changed the air filter but it still does it. Now a cant here the Turbo spin up either. could the turbo be on its way out?

Injector cleaner hasnt done anything either.

Answer 1

These engines recycle exhaust fumes when they run part throttle (EGR) and over time there could be a buildup of sludge in the manifold. This clogs the manifold and restricts the air passing through. When the flow is reduced, the engine gets less air but still sees the expected boost level. Since the ECU uses manifold pressure to measure turbo boost, it's providing too much diesel. You will probably have to have it inspected and cleaned - pretty straight forward job, but very messy work.

You have a VNT turbo, its possible that this isn't working correctly either because of carbon build-up. If so, you get massive low-down boost and the engine just wont rev.

Answer 2

If its a 96 then there is a good chance that it is simply soot. Diesel engines always throw out black smoke even when new. This is why it is a legal requirement to have a down pointing exhaust. The turbo on the audi diesels are very quiet so it could be that you are just not hearing it. Drive it hard through the gears and you should feel a distinctive pull at about 2 and a half thousand revs. Although, on a car of that age you might not get much of a turbo kick. That doesnt mean that the turbo is gone though, its more likely that the cam is worn from the cars years of service. I would check that before I checked anything else. Word of warning though:- if the car has done any significant mileage then the worn cam might be the only thing keeping the engine from blowing. Put a new cam on and you'll be more likely to use the extra power and might wind up blowing the engine due to its age. Whoever told you to use any kind of fuel supplement or in fuel cleaner was only trying to help himself sell the stuff!

Answer 3

The VAG 2.5 tdi would not be as strong an engine as the 1.9 tdi but nevertheless it shouldnt smoke too much. Can you see the smoke behind you when driving around the town? Any turbo diesel engine will smoke a little. Try keeping an eye on the oil level after your next oil change. Check the level again after 1000 miles and see how much the engine has used over this distance. If its around .5ltrs, then i would say that that is average enough for a car that has covered that mileage. If it is more, then i would suspect wear in the rings/cylinder bores.All the usual checks then come into play. Trade the car in and let some one else have the trouble.

Answer 4

that would be my guess a bad turbo. I'm not to fimiliar with diesle cars but I do know that when a gas car is emitting black smoke it means the engine is burning more fuel than air which is probably the same thing in your case.
which could be casued by a leaking fuel injector in which the fuel injector cleaner wouldn't have done anything. so that might be the cause.

Or the bearings in the turbo are bad and the turbo isn't allowing the exhaust to flow properly and building back pressure on the engine which might cause the black smoke

Answer 5

Golf Tdi Black

Answer 6

YOU NEED TO SEEK HELP HERE! If the TURBO does not WHINE then you have clogged up OIL FEED and RETURN lines from using the WRONG TYPES OF ENGINE OIL IN IT! NO VALVOLINE May ever be used in this car EVER! You MUST use only EUROPEAN SPEC diesel oil, like ROTELLA< and MOBIL ONE for DIESEL engines! BLACK SMOKE usually means that your diesel pump and injectors need to be FLUSHED and CLEANED UP with diesel purge chemical. A GREAT oil change center can remove the turbo OIL FEED and RETURN LINES and power scrub and clean them! I USE AMSOIL POWER FOAM for this job and have BENZ and AUDI and BMW turbo diesels out there with 300k+ miles on them NO ISSUES! Be SURE to read the SPEC NUMBERS on the oil you are using! AUDI requires spec numbers like 502,503,504, and 505 along with proper API ratings! GOOD LUCK!!

Answer 7

Hi put some injector cleaner in the diesel run a full tank of fuel through the engine with the ccleaner in the fuel.
It is my considered opinion that you have dirty injectors

Answer 8

black smoke is normal for a derv. its un burnt fuel. you will notice it more on a sunny day. ive got a chipped golf tdi and it smokes like a ***** on sunny day

Answer 9

You have pump/injector problems seek help!

Answer 10

I had similar problems with my Mondeo. It was the turbo.