2 pin idle switch (JT 4kq - Starting Issues Solved)

[Huw Powell]

> I have verified the idle switch has failed in the open position so
> the car never believes its at idle (checked with a voltmeter, and
> finally left it unplugged and drove around, no change). I'm certain
> because of this on initial start up the car is throwing itself in to
> closed loop mode (lean&  efficient mode) and ignoring the coolant
> temperature sensor telling it to go full rich until that first minute
> or so while the o2 warms up to start telling the ECU how much fuel to
> deliver.

That makes no sense, the idle switch does not tell it to go closed or 
open loop.  Think about it, when you start the car, if you depress the 
gas pedal a bit, it still runs fine.

> As for physical damage, I was able to get a good look at the switch
> and it seems the arm for the trigger is completely gone. My plan is
> to retain the switch body and build a new arm for it just to have
> something on the shelf for the future.

I may be wrong, but last time I messed with an idle switch, it had no 
"arm", just a little tiny button that gets pressed when at closed 
throttle.  but I may be wrong on this one, to repeat ;)

-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/