Throttle issue

[Jasn]

Hi
A couple of days ago I got a P1580 fault (Engine throttle, mechanical fault (sluggish/stuck)) on my Z3. I have taken the throttle body out and cleaned it. However, just working the mechanism manually (to simulate using the accelerator pedal), I am finding that sometimes the bit that opens the valve (not sure that's the right word) sticks still. I assume it shouldn't, but just wanted to be sure. If it shouldn't stick, any clues what the problem might be? Just more cleaning needed?

The first photo shows the throttle off and the second photo shows the throttle fully open, but notice that the bit that should open the valve is still in the off position in the second photo. (If I touch this it flicks open.)

I am a bit out of my depth here. Thanks for any help

Jasn

 

[Rudyrov]

Not very familiar with that part but if things aren't moving when they are suppose to then perhaps its bad? Spring loaded mechanisms usually aren't found in devices such as carburetors or fuel / air controls, they create a sudden rush reminiscent of an accelerator pump, but even that device is gradual squirting of fuel to avoid hesitation.
My guess is that the device you have in hand is defective or just not working right?

 

[t-tony]

A liberal spraying of carburettor cleaner whilst operating the “butterfly” might just bring it back.

Tony.

 

[Jasn]

A liberal spraying of carburettor cleaner whilst operating the “butterfly” might just bring it back.

Tony.

I spent a lot more time cleaning it...already looked clean after my initial efforts, looks like a mirror now. It is moving freely. I am a bit concerned that it won't take much to get it stuck again, but for now everything is working as it should.

 

[Jasn]

Not very familiar with that part but if things aren't moving when they are suppose to then perhaps its bad? Spring loaded mechanisms usually aren't found in devices such as carburetors or fuel / air controls, they create a sudden rush reminiscent of an accelerator pump, but even that device is gradual squirting of fuel to avoid hesitation.
My guess is that the device you have in hand is defective or just not working right?

I think a lot of them are electronic now. A really thorough cleaning of the inside of the throttle body and the butterfly valve seems to have things working OK for now.