2.5 TDI Black SMOKE

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2.5 TDI Black SMOKE

Postby MrTAB » Tue 15 Jan 2008 6:31 pm

Just got failed by MOT Station :cry: for too much black exhaust smoke.
My question; can the distributor pump be moved/ajusted (like on a Series3) to
take up any play in the timing chain i.e reducing the smoke ? or will I have
to replace the cambelt (Need to do this anyway, dont have the time now).
Or any further suggestions, advice.
Thanks in advance for any replies.
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Postby Ralph » Tue 15 Jan 2008 7:10 pm

Get some Redex or Millers diesel injector cleaner, chuck a good dose in the tank & go for a good long hard run, make the engine work hard, then go for a exhaust gas check.
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Postby Greg Tingey » Tue 15 Jan 2008 7:10 pm

Don't think so (But I could be wrong).


Sounds like the injectors need a good clean / overhaul /replacing .....
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Postby bango690 » Tue 15 Jan 2008 8:28 pm

put the cleaner into the fuel filter neat and the rest in the tank!
(as described in the mag
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Postby martinhollings » Tue 15 Jan 2008 8:59 pm

also take the air filter out and clean out the intercooler
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Postby shanghai1979 » Tue 15 Jan 2008 10:08 pm

As others have stated do the cheap things first. Smoke is incomplete combustion. Increase the air flow by changing the air filter, Clean the injectors out (spend £10 on some diesel injection system cleaner). Get a new fuel filter and fill it with injector cleaner, fit it and rev your defender. See if it helps the smoke situation. If not then maybe it's the valve seats?? Gosh who knows but go for the cheap options first.
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Postby mick » Tue 15 Jan 2008 11:07 pm

If its a 200 tdi,(and i see it is),could an option be to do a slight reverse of the pump tweak featured on here often in the past by Pistonbroke and others.Maybe take the boost housing cap off(if thats what its called )and turn back the diaphragm by a few dedrees,and possibly alter the smoke screw.Sorry my description is'nt too good but do a search on here and you should find the info.
You hav'nt got a split hose or owt have you?
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Postby Aragorn » Wed 16 Jan 2008 3:02 pm

everything above is valid i'd also check all the pipework for splits or leaks as if the turbo is leaking boost then it will smoke a lot more than it should, make sure the wastegate is operating properly and the boost pressure is at the correct level too or again you will get a lot of black smoke
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Postby shanghai1979 » Wed 16 Jan 2008 5:26 pm

Oh or another thought.... bribe the MOT man.... if your up north that is .....

Personally I'd never do such things but the pervious owner of my Tdi certainly must have done (I'm looking at you MRM)
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Postby rusty90 » Thu 17 Jan 2008 12:50 pm

I was once told by a black hack driver that he adds a litre of paraffin into a full fuel tank. Give it a good run then go for the smoke test.

I have never tried it and would not til others agree also. :D
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