The UK quattro Network

Audi ur-quattro 10V WR, WX and GV Engines
Checking the idle and full load switches

CAUTION: It is possible to mis-set the throttle switches
such that they hold the throttle open - this can be dangerous

Note: The throttle body must be removed from the vehicle for this procedure. The cross-head screws used to locate the microswitches are notorious for shearing on older cars - given the very low price it may be appropriate to obtain a new bracket (035 133 095C) and four new fillibuster screws (N 014 154 1) in advance of starting, especially if the vehicle is in regular use.

• Attach the 3084 pointer to the throttle valve body using the lower throttle body mounting thread
• Screw the protractor dial to the throttle valve quadrant, if necessary removing the fixing nut on the throttle valve lever
• Attach the ohmmeter to the contacts on the idle switch
• Set the protractor dial to 0°
• Open the throttle valve to about 20° and allow it to close slowly
• The ohmmeter must indicate zero ohms between 2.5° and 1°

If the test fails, adjust or replace the switch. Adjustment may involve loosening the mounting screws - usually very difficult - or simply bending the actuating lever on the microswitch. Always check function with full throttle travel - it is easy for the levers to fall behind the operating post on the throttle valve lever or even jam against the post, holding the throttle open.

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