AFM broken down

[cankayin]

My AFM is not working properly, needs to be replaced.As I live in Izmir/Turkey, it is not easy to find one.At last I found one, but it is for Evo III.My original AFM is 0280 203 028, the one I found is 0280 203 027 which is for EVO III.Does anyone know if EVO III AFM would work with my Euro M3.Do I need to give any more information about my M3, if so pls ask.

can

[hardtailer]

the return spring inside is stiffer than inside the required AFM. It means that for a certain amount of air entering, the flap is not opened as much resulting in less fuel injected. That would mean leaner running of your engine.

I don't know if the lambda control would be able to make up for that when you're not running wide open throttle (WOT), but as this control is not active at WOT you'll run lean then.
Perhaps you can get the return spring out of your old AFM into the new one?

[cankayin]

I dont have lambda control, the cat. was removed before I bought the car.

[hardtailer]

then you might suffer lean running also at part throttle.

[cankayin]

but do you think if I switch the springs will work.Or if I open the black cap and make some adjustments, could that work out too.

can

[AlpineRunner]

The stiffer spring and lean condition theory makes sense to me, but then how can ppl run the 2.3 AFM with the 2.5? I know that something has to be paired, I'm not sure if it's injectors and chip or AFM and injectors or chip and AFM, lol.

My guess is that the AFM output signal is calibrated for the stiffer spring and so they are interchangeable.

[BoxFlares]

Someone would have to know what happens when you run a 2.5 AFM with a 2.3 motor.

[TeamM3]

if the flap isn't opened as much wouldn't it also mean less air too?

the comment about the Evo3 AFM not being open as much and then means less fuel assumes it sends the same signal for the same opening position as the 2.3 AFM, I'm not sure if that's the case

[Chris F.]

I've been under the impression that the E3 AFM required a E3 AFM-specific chip to properly interpret the signal.

[hardtailer]

Originally posted by TeamM3
if the flap isn't opened as much wouldn't it also mean less air too?

not if the air velocity is higher...

If the only difference is the spring, i.e. the potentiometers inside are identical, then the signal is the same for both AFM's at identical flap angles.