Vehicle & Technical > Discovery

Black Smoke on Hard Acceleration

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philhunt:
Had a full width intercooler fitted about 9 months ago which made a huge difference to performance on my 300 tdi particularly at the bottom end. When it was fitted the fuelling was adjusted and I was told that there was a fine line between achieving optimum performance and better performance but with more smoke!

In the last month or so, I've started to get a lot more smoke on hard acceleration. When I ease off the throttle, the smoke level goes back to normal. My fuel filter has been replaced since the problem started and I have a K&N filter which has been in for only 5000 miles. I've run some fuel system/injector cleaner through the tank and there's been no improvement.

I've an MOT due next month and it would be difficult for me to get back to the firm who fitted the intercooler in the next couple of weeks. I assume that I can make some minor adjustments to the fuelling given the right guidance and photos/diagrams from Forum members so hopefully some of you experts will come up trumps for me like you usually do!

extreme90:
who fitted the intercooler
and exactly what part of the pump did they make adjustments to ?
it sounds to me like the full load screw( smoke screw) need's backing off 1/4 of a turn
dan

philhunt:

--- Quote from: "Traybackdan" ---who fitted the intercooler
and exactly what part of the pump did they make adjustments to ?
it sounds to me like the full load screw( smoke screw) need's backing off 1/4 of a turn
dan
--- End quote ---


Scorpion did the intercooler - not sure which part/s of the pump they adjusted.

Is the full load screw (smoke screw) the one under the diaphram?

bilge rat:
prob back off the diaphram about 1/8 -1/4 0f a turn too. mark it first you can always set it back then. alan......

treeman:
not to sure if this would work but wouldnt fitting a fuel pressure regulator save messin about with the fuel pump?? just fit in the fuel line and wind it down for the mot, this is what i do on my corsa because i have took the cat off, it doesnt run good at all but its way under the emissions :-)

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