Again, when it rains it pours!!...now bad throttle switch?

[Huw Powell]

> Today, I was cruising along the expressway under heavy
> rain and all of the sudden, the '85 QSW starts to slow
> down quite a bit even with my foot on the gas pedal.

> Went back to the engine bay and this time I played
> with the throttle switch by clicking the switch as
> when on full throttle and then manually revved engine
> and it worked fine.

> So bad throttle switch?

Maybe.  If the *idle* switch is bad/closed the ECU won't allow revs over 
about 1400.  btdt, unplugged the switch connector, drove home fine, 
bought new switch assembly...

> What's its function?

The idle switch tells the ECU to run the engine at idle with the ISV etc.

The WOT switch, the one you zip tied, takes the system out of closed 
loop and richens the mixture for hard acceleration.  It seems, in your 
case perhaps, that it might also override the idle switch.

-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/