Hunting at idle

[Deleted member 138290]

My w211 has started to hunt at idle on start up, when cold ? Egr is fine altho needed a clean... wonder if I might have an air/ boost leak somewhere ? Having wheel alignment again tomorrow morning after clipping a kerb 2 weeks ago avoiding a truck veering from the lane next to me in Notts, when I get back I will check the turbo pipes/ hoses etc.....

 

[mersum1es]

rail pressure varying due to injector leak, or fuel quntinty valve starting play up...

 

[Deleted member 138290]

Is the fqv is valve that sits on the front of the HP fuel pump ? Ifso I’m sure I changed around it around a year ago .... I might just have another in my garage......