406 black smoke

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,

 

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,

 

Hi Chrei
Yeah changed the oil aswell. she's not burning any oil at all but is
using more diesel than she should?

 

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 watson diesels a call
cheers

 

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

 

I'm away on tour at the moment but will phone them next week.And let
you know how I get on. cheers greggi g

 

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