Quote:
Originally Posted by Uwon
To the OP, I don’t mean to highjack your thread but I think that jfairman’s post neads further clarification.
.....yank what off an old BMW or Mercedes? Also instal tiny ball valve?
Please expand, thanks.
Johan
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Sorry I didn't go into more detail before.
Older Bosch EFI motors like L jetronic and K jetronic had a Pierburg idle control valve that opened and bypassed enough air around the throttle body to raise idle speed around 200 rpms if no extra load was put on the motor. It was supplied 12 volts at the same time the AC pump clutch engaged so idle speed would remain the same or real close to it when the AC pump was engaged.
It was either open or closed all the way with no steps in between.
When Motronic EFI came around the idle control valve was changed and improved so it could open varying amounts depending on load, altitude, or whatever so it would control and maintain the idle speed at the factory set rpm at all times if everything was working correctly.