[gazzza]

Guys and Gals

Just got a 2016 pre-owned M2 with Milltek exhaust.

The exhaust valves are permanently open. I need to test the system to diagnose the issue. There are many possible reasons - I need some advice on how to track the issue.

Can anyone help please?

Thanks

[gtaM2]

Originally Posted by gazzza

Guys and Gals

Just got a 2016 pre-owned M2 with Milltek exhaust.

The exhaust valves are permanently open. I need to test the system to diagnose the issue. There are many possible reasons - I need some advice on how to track the issue.

Can anyone help please?

Thanks

not sure how the miltek exhaust works , i know the stock exhaust has one flap on the driver side, there is a plug that goes in there, its possible the previous owner has left it unplugged, seems to be somewhat of a common mod for people who want the flap permanently opened , if you look under the car from the rear driver side you should be able to see where the plug goes, the miltek exhausts flap may be unplugged

[gazzza]

Thanks

The wired connection is still on, both sides....so the question is....where does the signal (voltage) originate? That would be my first check....

Then what control system actually causes the signal to come on....

Still frustrated!

[gtaM2]

Originally Posted by gazzza

Thanks

The wired connection is still on, both sides....so the question is....where does the signal (voltage) originate? That would be my first check....

Then what control system actually causes the signal to come on....

Still frustrated!

i know the M Performance exhaust has a device in the trunk in the middle under the carpet where the flaps are plugged into, id check there first

[gazzza]

Originally Posted by gtaM2

i know the stock exhaust has one flap on the driver side, there is a plug that goes in there

Guys....really would like to know how the stock M2 operates the stock exhaust valve.....anyone have an answer?

[gazzza]

Just closing this off in case anyone else finds the post...

...I ended up fitting the Miltek valvesonic controller that allows me to program the open/close points by gear, % throttle and revs...very cool.

Plus can override OPEN/CLOSE by the volume controls on the steering wheel.

[cookiesowns]

It’s PWM controlled via the DME. You can’t remap it unless you use a controller.