WIde open throttle switch

Steve Sears steve.sears at soil-mat.on.ca
Tue Aug 9 12:17:20 PDT 2016

Hi Al...err.....aloHA! Al,
That sounds like how my 5ktq behaved when the ISV was leaking.  On that car, the ISV's position at rest was to block air, and there was a little getting through.  On some ISV's, they will allow air to pass at rest, and the valve both opens further and closes (IIRC those are 3-wire, whereas the NC ISV's are 2-wire?)
Perhaps clean the ISV with a throttle body cleaner while cycling with a 9-volt battery?
Steve Sears
2001 allroad 6MT
[1987 5kTQ] - sold
1980 5k
1962 and '64 Auto Union DKW Junior deLuxes
1961 Zweirad Union DKW 158 Violetta - wall art
1930-something DKW F? Projekt - on the back burner

-----Original Message-----
From: Alan Streicher <streichea001 at hawaii.rr.com>
To: Quattro <quattro at audifans.com>
Subject: WIde open throttle switch
Message-ID: <CD5E23A1-68BB-42EF-83B1-A869505FA85D at hawaii.rr.com>
Content-Type: text/plain;	charset=us-ascii

Audi model 80 2.0 3A
This must be fixit month.
Problem: surging throttle, up RPMs, then down. When idling, engine goes from 950- 1800. Up and down. Same when I'm driving, throttle has an up, down surge, but not more than 100-200 RPM.

I checked the idle and full throttle switches.
Idle switch.
Connect a multi-meter, switch on, throttle closed: 0 volts Throttle open slightly: approximately battery voltage.

Full throttle switch.
Switch ON ignition.
Throttle closed: approximately  battery voltage.
Throttle completely open: approximately battery voltage (should be 0 volts).
Manually depressing the lever, on the switch, no change, battery volts. 

So the WO throttle switch is not working.
Is this causing my engine to race up and down?
I have looked on the Internet for a replacement switch, none found.
Can I just disconnect the WO throttle switch? 99% of my driving is on city streets.
Would anyone have a spare switch with harness, PN 026133093D, that I can buy?
Any other solutions gladly welcomed.


Sent from my iPad

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