Fw: '90 200 high idle

Nick Lawrence nick at beol.net
Wed Oct 5 08:47:26 PDT 2011

I checked the switche(s) on the  throttle body. Pins 1 + 2 continuity at closed throttle  Pins 2 + 3 at full open throttle. Repeated cycles to reduce the possibility of intermittent contacts.
Althought the idle speed always drops back when I disconnect the ISV, any reason to be looking at something else?
What does the decel valve do when it gets flaky?
Nick  central Ohio 
----- Original Message ----- 
From: Nick Lawrence 
To: quattro at audifans.com 
Sent: Thursday, September 29, 2011 3:14 PM
Subject: '90 200 high idle

I am experiencing random high idle (2000+/- rpm) in my '90 200tqa.  
 It will drop when I unplug the ISV.  I have cleaned it, does the fact it always drop when unplugged rule out sticking?
What all inputs info to the ISV control.  I guess turning on the air, or does it only work by seeing a drop in speed?
TIA for suggestions.
Nick  central Ohio

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