More M54 questions!

[zero 1162]

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 1071]

Blocked injector?

Exhaust leak?

[zero 1162]

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 950]

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

[zero 1162]

I swapped on a known working maf from my other car and after 200kms of driving the engine light has not come back on yet so fingers crossed.

 

[Ahmedsinc 414]

On 12/16/2019 at 12:33 AM, zero said:

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?

So we finally resolved the issue.

 

I run the wagon on 98 octane, the only source local to me is Gull. Being E10 it generates a slightly higher AFR than regular petrol. The narrowband post-cat O2 sensors presumably have a very narrow tolerance. Switching back to 95 octane from the local Z eliminated the issue. Cheers to Joe Clifton for his input, was 100% correct in his assumptions. Worth a try Nathan!

Edited June 22, 2020 by Ahmedsinc

[Statek 87]

4 minutes ago, Ahmedsinc said:

So we finally resolved the issue.

 

I run the wagon on 98 octane, the only source local to me is Gull. Being E10 it generates a slightly higher AFR than regular petrol. The narrowband post-cat O2 sensors presumably have a very narrow tolerance. Switching back to 95 octane from the local Z eliminated the issue. Cheers to Joe Clifton for his input, was 100% correct in his assumptions. Worth a try Nathan!

Thanks for the update! I also run our X3 on Gull Force 10 - I'll try the same solution ?

[B.M.W Ltd 950]

I won't use "GULL" full stop on anything I own or have owned

 

[Ahmedsinc 414]

57 minutes ago, Statek said:

Thanks for the update! I also run our X3 on Gull Force 10 - I'll try the same solution ?

Took 2-3 tanks to resolve the issue so don’t expect miracles immediately 

[Ahmedsinc 414]

55 minutes ago, B.M.W Ltd said:

I won't use "GULL" full stop on anything I own or have owned

 

I wondered if it’s more to do with lambda tolerances in the fuel maps, had no troubles using e10 in my E36, admittedly I ran a Link ecu so could adjust tables accordingly

[zero 1162]

On 6/22/2020 at 4:39 PM, B.M.W Ltd said:

I won't use "GULL" full stop on anything I own or have owned

 

Why is that Glenn?

[B.M.W Ltd 950]

It gave a lot of problems with their fuel when they came out with their blends about 10 years ago. I just won't go back there. Bitten once.... F>>K ya

[geeveejay 4]

interesting reading, having got the 171 and 174 codes, have the car booked in for a deeper dive tomorrow at a specialist , as I dont want to randomly spend on it. I have done the obvious stuff