Idle switch

[T.Hanson]

Unplugged the finicky thing. Drives nice.

So why is the pain in the butt to adjust thing there in the first place ?

Try again, but I had it clicking off at the last possible point before closed butterfly. Driving it was as though there was a spring in the throttle linkage. Boing, boing, boing, jerk, jerk, both accelerating and back.

[Mike W.]

So why is the pain in the butt to adjust thing there in the first place ?

My guess is as a fuel cutoff on decel, as that's what it does. But according to the O2 sensor, it does it anyway, readings go way low, like down to zero on decel anyway. But maybe it just goes lean, not off completely. Whatever it does, all Bosch FI cars seem to have some variation of them.