Loud knocking noise front top end and smoke

[SheddySheard]

Hi all, I’m new to the group. I have a 2009 X5 3.0d m57 with a loud knocking noise from the top end of the engine and white/grey smoke from the exhaust.

I have tried unplugging the injectors one by one but the noise remains, it seems to becoming from the top front of the motor.

Any suggestions would be welcome

 

 

[Greydog]

Morning 

A diagnostic scan needed to be sure, have all the injectors been tested wiring loom checked

Dave

[SheddySheard]

Diagnostic scan shows nothing, I’ve unplugged the injectors one by one but the noise remains. I had the injectors tested and all seemed fine but I know they can suddenly fail. I’m thinking it might be a stuck or broken follower, so I’m going to take the cover off and have a check.

Do these suffer from oil galleries getting blocked

[SheddySheard]

Just managed to get injector 5 out as it was stuck fast and I didn’t have a pull, now it’s out I’ve found this which I’m guessing is going to be my problem. A very badly seated injector 

[Greydog]

Looks like you may have found the bad one check if you can change only one? I seem to recall reading they need registering 

But then at my age I could be wrong

Dave

[SheddySheard]

Yes, they have to be coded to the car but I’m going to get this one checked first as it may have just been badly seated and loose 

[Greydog]

Fingers crossed for you 🤞

[Rossco578]

Hi,

 

I have the same fault, was it the injectors?