E30 M3 Throttle Housing Assembly Throttle screws

[M3Tarmac]

Hi All,

Anyone able to shed light on the Throttle screws on each throttle body / intake on the E30 M3 S14 engine? Part # 13541402567.

[M3Tarmac]

They seem redundant but are maybe used for tuning the engine?
Any hints gladly received as the car is nearing return to the road and I want to set the engine up as best as possible.

[M3Tarmac]

Photo of the screws in question

[kundiboy]

Those screws are used to balance the individual throttle bodies. If you do a search for balancing ITBs on S14.net there is plenty of info on how to set them.

[M3Tarmac]

Thanks kundiboy.
Any tips on the similar 4 bolts on top of the exhaust manifold primaries? I gather they are for measuring CO / CO2 but no more info.