Posted by: JeremyG 17th February 2019 17:05
I also decided to strip down the idle control valve - this was a second hand unit I bought from eBay as a backup...
Here it is:
The casing is in two parts, with a cylindrical spring fixing keeping the two parts together. I used a self-tapping screw to remove it:
Then the two parts rotate against each other and separate:
The section on the left contains an electromagnet (you can just make out the coil windings):
... while the stem of the part on the right is magnetic. It rotates to open and close the drum-shaped valve that links the two ports, and allows air to by-pass the (closed) main throttle valve.
Here it is doing a Dalek impression to show the range of movement it has:
Anyhow, bottom line is, the valve on this unit moves much more freely than the one on my car. So if I get any idling trouble, I'll switch this unit in.