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Re: WOT switch

> Because Audi is a long-time leader in the "make your car complicated"
> contest, there are three devices to richen the mixture on the
> turbocharged K-Jetronic injected engines:

Ever seen a mid 80s carbureted US Honda Accord?  About 200 vacuum
hoses running around in there!

> 3) A frequency valve. It is used by the ECU to alter the control
> pressure depending on signals from the oxygen sensor, throttle switch
> etc. I'm not sure if ECU uses it to richen the mixture during warm-up
> period.

It is used to richen the mixture during warmup until the O2 sensor
warms up enough to work.