smoking 200tdi

Hi bit new to all this, this may have already been covered. I have a 1989 One Ten CSW which has had a disco 200tdi engine fitted mileage on engine is approx 105K. On start up i get a large puff of black smoke and when i accelerate hard i get lots of black smoke out the exhaust. I know as its a diesel i will get i bit of smoke out the back but just wondered if i can reduce the ammount at all or stop it altogether?

If you stop it altogether you'll be very popular with the queue behind you as your top speed will be about 20mph.

Its quite normal, someone may have tweaked your fuel pump to get a bit of extra power, you can tweak it back a bit if you're concerned at the amount of black smoke or if it fails the MOT!

If its not broke, don't touch it...or it'll break.

The puff at the start is also normal for these engines.

It might just need a good service. Generally speaking, black smoke is produced when there is plenty of fuel being injected, but not enough air for an efficient burn of the fuel. That said, there will always be a trace of black smoke when the engine is fueling correctly - it's better to have a little more fuel than necessary than not enough. Have a look at your air filter element and if it is filthy - replace it. Also check that there are no leaks along your air intake hoses (particularly between the turbo outlet and the inlet manifold). Remove all your air intake hoses and check for signs of delimitation. As hoses get older, the internal rubber / silicone laminate breaks away from the outer supporting laminates. As the engine draws air in, any saggy / flappy bits along the pipe work are sucked flat and the engine is starved of air which results in plumes of black smoke and a distinct lack of power. A collapsed or ruptured intercooler will also have similar effects.

Alternatively, as suggested by Storm, it may just have had the injection pump played with to get a little extra power. If you take a look at the very top most part of the injection pump (the cover held down with four bolts), is there a tamper proof cap in the centre, or can you see a circular recess with a hex-bolt and a lock nut? Also, do the four bolts that hold the top cover down look to have been removed in the past? If you suspect the pump has been tweaked, DO NOT just try to adjust it back without knowing what you're doing or you will likely bugger it up completely. Another possibility is that your injectors need new nozzles and the pop-pressures resetting but they are usually good for a couple of hundred-thousand miles before they need any attention, so start with the simple things!

Mine has a brand new injection pump, new injectors, new turbo and all new hoses and it smokes like a bitch when I deck it - it shifts a fair bit too but that's fuel pump tweaking for you Start simple - replace all your filters, give it some fresh 10-40 oil and fill your new fuel filter with injector cleaner before you screw it on.

-Tom

Thanks for the advise guys will have a look when back in the country

NickW110 said:

Thanks for the advise guys will have a look when back in the country

Click to expand...

Back in the country! I damn well hope you're staying on land pillaged by an English colony

Budapest at the moment, F1 pitlane is basically all British and we take over wherever we go!

Which F1 team ?

Williams grand Prix

This is fantastic, I have given advice to a Formula 1 mechanic Do you have a blog or a photo stream anywhere?

-Tom

black smoke on start up is extra fuel for starting,during acceleration but goes when crusing is turbo lag boost air from turbo takes longer than fuel to reach cylinder