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

[L DC]

Just to add to the previous msg, on the VW QSW there
are two swtiches on the throtle body, since it's
CIS-E.

According to a lister on the QSW the following
applies:

The one (switch) on top is full throttle enrichment.
Only needed normally in high rpm, high load, full
throttle type situations.

The one that's harder to see if the idle switch. Helps
CIS-E start delivering gas again after you've been
coasting in gear or coasting in neutral and RPM
falls after you've shifted to N. Affects idle, too.

Both of these switches get beat up by exhaust heat.
The idle one especially, I suspect. Later VW's had a
heat shield under them so radiant heat from the
exhaust didn't get them so directly.

I ZIP-TIED THE THROTTLE SWITCH ON TOP of the throttle
body.

--- L DC <ldc007usa at yahoo.com> wrote:

> Thank you all for your replies.
> 
> For Chris, YES, the VW QSW is equipped with a 3-wire
> oxygen sensor. The VW QSW is essentially an Audi 4KQ
> boasting the 5 can, 2.2L, JT engine and tranny.
> 
> As Huw pointed out, last night once I got home, I
> disconnected the plug on the WOT switch and it ran
> fine. It, however, seemed to idle just a tad better
> with the WOT switch pugged in and zip-tied.
> 
> So, Huw, is the throttle switch the culprit or oxy
> sensor or idle switch (same as idle stabilization
> valve, no?) for that matter?
> 
> Anyway, any adverse effects by driving the car with
> the throttle switch zip-tied or unplug?
> 
> Thanks again,
> 
> 
> -Louis
> 
> 
> --- Huw Powell <audi at humanspeakers.com> wrote:
> 
> > > 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/
> > 
> 
> 
> 
>  
>
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