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Originally Posted by Ducati750cc
If it's drawing air in from somewhere that can cause it to smoke i've been told.
Black smoke is mainly due to a fuelling / air problem, either excess fuel being injected for the amount of air drawn in or insufficient air drawn in for the amount of fuel injected, both amount to the same thing an over rich mixture.
If you had a leak in the intercooler pipework, air would be blown out, not sucked in, it is at whatever pressure the turbo is producing.
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When flooring a turbo diesel from low revs or idle there will nearly always be a puff of black smoke initially, this is due to the amount of fuel your foot is asking for being injected almost instantaneously before the turbo has time to spool up to pressure, the exhaust returns to normal when the fuel to air ratio is correct a second or two later.
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If you keep your foot down does the thick black smoke continue, or does it settle to a normal exhaust ?
You need to check the whole air side of the system from air inlet through to the inlet ports for restrictions, also that the turbo pressure and air flow is within spec.
Intercoolers can be partially blocked, rare but not unknown.
Next is to check fuel side to ensure that the fuel pressure is correct and that the injector dwell time is as it should be.
Another odd one is a partially blocked silencer that causes an increase in exhaust back pressure
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My tourer does not put out any smoke even if i boot it, which i do at least once a week i drive it like i stole it,
Richard
you could always contact Jamie, and ask him for an health check with his full fat T4, i am sure he would come to you or you to him.
https://the75andztclub.co.uk/forum/p...=newpm&u=31100