Help needed for ECCS identification

Hi there - Rog here new to the group!

Hope someone can help me identify what the three screws on the picture attached adjust? My local mechanic is curious...

any help would be appreciated
Thanks
 

Attachments

The far right is idle speed if I recall correctly, the others something similar to do with engine tuning I expect!
 
OP
OP
frisbyfig
thanks for that, appreciated, hadn't noticed until I expanded photo that there are three letters against the screws F V & S??
 

frank

Club Member
those 2 solenoids look the same as the GA16 idle control valves to me, so praps fine tuning screws ?
 
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