Anyone tell me what this screw is for, is it to do with balancing the throttles? It's the hex headed one with a slot in it on the right hand throttle body assembly.
Cheers
Cheers
What's this for?
- Thread starter Rusty Bolts
- Start date
No it isn't, don't touch it! TBs are balanced above idle using cable adjuster only.
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Toubab
It looks like it might just be the bolt that secures the cable stop to the TB 
(through part labelled 2 the idle control, then through the "covering cap left", through into the throttle body itself)
(through part labelled 2 the idle control, then through the "covering cap left", through into the throttle body itself)
It is pat #22. labelled "ISA screw". It sets the idle stop position for the butterfly valve. Do not touch, these are set in the factory by mystic elves, no-one knows how to deduce any better position than the one they are in. There should be a rubber cap on it to avert curiosity.
There is what looks like a cap in the corresponding place on the Left hand side. When I was watching the BMW mechanic do the balancing he was tweaking it at idle and then doing the cables off idle.
My understanding was that the idle motors each move the same counts to maintain the RPM and this screw is for balancing the bodies at idle. I can't see how the steppers can adjust the balance as they don't have any feedback sensors.
The bodies are probably set at the factory but can be adjusted as they wear.
My understanding was that the idle motors each move the same counts to maintain the RPM and this screw is for balancing the bodies at idle. I can't see how the steppers can adjust the balance as they don't have any feedback sensors.
The bodies are probably set at the factory but can be adjusted as they wear.
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