It has a vacuum unit, its turned out to not be the actual pump but the injector. We've changed the injector but need to adjust the idle speed.
Any suggestions would be helpful
Hithere i am the person who is doing this job for lee my name is Andy.
Engine starts to misfire when misfire occurs excessive amounts of fuel come from injecter pipe number 2 .Then the engine struggles to run and stalls .
Removed all the injecter pipes from the pump to see if we have equal amount of fuel squirting from all the outlets on the pump .
Number 2 has lots coming from it and the rest barely has any.
Then intermittantly we get an equal amount from each one and the engine runs ok then on overrun there is some diesel knock.
At one point the knock was on number 1 cylinder and lots of diesel was coming from this pipe .
In my opinion i seem to think there is a problem with the injecter pump .
Will try changing the pump.
Many thanks for your help