Hi My 406 2.1 diesel S reg. kicks out black smoke on acceleration be it light footed or heavy she constantly delivers black smoke.just had all filters changed and new injectors. anyone got any ideas as to what the problem could be,
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:
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.
MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.