Re: WGFV, LED Tester and WOT Switch

[Mark Pollan <Mark.POLLAN@mci.com>]

>> I have the tester leads long enough so that the LED is right in front
>> of me under the wiper.  When I go WOT, what should happen?  LED stays
>> lit as long as I am WOT?  If it doesn't that means WOT switch is bad?

Phil responded to my quip above:

>Rig the LED to the WGFV itself.   When you got to WOT, it should flicker
>continuously.  If it goes either solidly on, or gradually goes out, the
>ECU cannot control the wastegate as it wishes.  On the ur-quattro,
>gradually going out with increasing speed is a symptom of too much
>preload on the wastegate spring - with practice, I've become able to
>guess the shim thickness by watching the LED.


Thanks Phil. That is how i rigged it. Waiting for the commute to work
so that I can open her up. So this will let me know that the ECU is
trying to correctly do what needs to be done but the WGFV may still be
bad? So how do I test the WGFV itself?

TIA as always,

Mark Pollan, '86 5KCSTQ 259K Miles