More M54 questions!

[Statek 62]

4 hours ago, NRJ said:

It will more than likely have a small split in the PCV diaphragm or PCV hose. The lower rubber PCV hose that goes to the dipstick tube goes really soft over time causing leaks. A smoke test may not show up a small hole or split. 

I'll be checking that out - I've got a mate with a brand new PCV spare, since he recently went to an M50 manifold. Cheers for the tip @NRJ

[zero 960]

So, I'm still chasing similar codes to the ones @Ahmedsinc was.

Even though I had replaced the ccv and hoses a few years ago, I replaced them again last week but the following fault code returned after about 50kms -  227: Lambda contol tolerance Bank 1.

I also used a new inlet manifold gasket of course.

Over my ownership I've also replaced both intake boots, both rubber bungs at the back of the manifold, new disa and its gasket, the 'f' piece and both its hoses, injector o-rings, dipstick o-rings, fuel vacuum rubber hoses, fuel filter, throttle body gasket.

I've also cleaned the throttle body, the idle control valve, and the maf. I've also replaced the throttle body with another used one I had lying around, and checked and cleaned its connector.

I'm pulling my hair out - anyone have any ideas? 

[Allanw 854]

Blocked injector?

Exhaust leak?

[zero 960]

I cleaned and tested all the injectors when I replaced the orings, and also used a bottle of injector cleaner in the tank.

 

There are no exhaust leaks.

@B.M.W Ltd - do you have any advice on what it could be?

[B.M.W Ltd 648]

227 is a running lean code and in your case limited to bank one over a 50km test period. I would suggest talking to Gavin@High Velocity or Joe@Eurosurgeon and get it checked on a dyno to determine when the lean running occurs