Vehicle & Technical > Discovery

Black Smoke on Hard Acceleration

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Ja1983:
to be honest its more an issue of the chemicals in the smoke, over the density of smoke... mine regularly poofs up enough to cover the tailgaiter behind under hard acceleration, but you have to remeber that this is while the engine is under load.... for the MOT ?(IIRC) they rev it stationary, thus less will come through anyway... i`m also thinking that the nastys in the exhaust are reduced  when you run bio-dev...

the off boost fuel adustment is controlled by the little * drive behind the dust cover



"First off is to adjust the smoke screw, this apparently controls off boost fuelling and can be accessed by removing a small metal 'dust' cap, it is held in place by a 13mm locknut and the screw has a Torx head, I slackened the lock nut and held the nut whilst I wound the screw in half a turn... Has it helped?????
Well I run on bio veg oil and when cold the engine has always hunted (revs rise n fall), turning this has virtually eliminated that so Im more than happy, could've turned it more as it still doesnt smoke but I will run a while first..."

....the above is the guide to INCREASE the fuelling, so i would do the reverse of that...

have you disconnected the EGR pipe? - if so, reconnecting will help.

maybe pop down the MOT station before hand and have a quiet word... they may well say "yeah, its a diesel.. we did one t`other week twice as bad and it flew through"

..or they could also say "dont you dare bring that thing down here!"

this little bit of insight could well saver you getting messy and having to tinker afterwards to rectify the fuelling...not that you would of course, as this would then invalidate the emissions test that was carried out on the MOT (you know what i mean ;) )

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