Re: Series 1 1990 2.0i XM Auto Throttle Body

[Tim Young]

Pictures of my throttle body from above with views of throttle adjustment screw and idle control screw.

XM Throttle Body.jpg

Throttle Body

XM Throttle Screw.jpg

Throttle adjustment screw.

XM Idle Speed Screw.jpg

Idle speed screw.

[Dieselman]

Assuming this is connected to an idle speed issue, the lower screw is the throttle setting for idle speed and isn't the upper screw the stop for the secondary throttle flap, which should be closed until the main throttle flap is about 3/4 open.
That will then give the minimum volume of air the engine can be fed with and any additional air required for cold starting will be via the supplementary air valve.

The throttle switch needs to sense the throttle closed/open. It should click as the throttle is opened a little and closed.