Idle Actuator/Air Regulating Valve
- Remove plug connection on idle actuator. Turn ignition on. Connect voltmeter to middle contact of plug connector and ground. See Fig 1
. Nominal value should be 12 volts.
- Reconnect plug connector on idle actuator and connect tachometer. During stable idle, screw in throttle by-pass screw. After a short time, idle speed should re-adjust itself.
- To check the activation of idle actuator by the control unit, connect a new or proper functioning idle actuator to plug connector. Turn ignition on. The idle actuator should vibrate.
- Start engine and increase idle speed by screwing out air circulation screw. The idle actuator should turn in the direction of closing. After lowering idle speed, the idle actuator should turn in the direction of opening.
Courtesy of PORSCHE OF NORTH AMERICA, INC.