406 black smoke

When you done all the filters did you do the oil at the same time, replace it with a good make.mine smokes when the oil needs to be replaced,

diesel going into the pots? or leak at pump?leak at injectors seal at tip.

Excessive fuel consumption.... Air filter element dirty or clogged. Preheating system fault. Incorrectly adjusted idle speed. Incorrect fuel injection pump timing. Brakes binding, Tyres under-inflated.

just got it out of the haynes book

run it up the A3 to Watson Diesels i think it might have to go there,at least it can be looked at.possible while you wait,,

Not the haynes book that says "warning remove battery before any work is taken out on the vehicle" but I only want to change the tyre! just love them manuals

Yeah Ill give wats> snipped-for-privacy@greggig.co.uk wrote:

Well what did they say? let us all know please.

The normal cure for black smoke is to floor the fast pedal in second on an empty road and wait for the smoke to clear, most of it will be soot in the exhaust. Otherwise, as you have had new injectors fitted (I assume correctly, and that they were set to the correct opening pressure for the pump) then the only other thing is the pump internal control. Don't know which pump you have but some have a diaphragm which senses turbo pressure and increases the fuel supply accordingly. This might have gone out of adjustment.

I had a 405 turbo which showed this problem, and was able to adjust the spring pressure under the diaphragm to cure it. It could be that this spring has weakened, but it would be unusual.

If your model is fitted with an EGR ( Exhaust gas re circulation) valve - check that it is not sticking - you will more than likely have to remove it to check - if it is and it will free off great - if not replace it - if it is working ok then try blocking off the vac pipe going to it - then give it a good thrashing to clear it out - hopefully this will fix the problem ! Mike D.

cheers Ill have a look thanks gregg

Mike D wrote: