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Home >> Porsche >> 1986 >> 944 Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - BOSCH AFC >> Testing >> Idle Actuator >> 944 Turbo

944 Turbo

  1. Remove plug connection on idle actuator. Switch on ignition and connect voltmeter to middle contact of plug connector and ground. Nominal value should be 12 volts.
  2. Reconnect plug connector on idle actuator and connect tachometer. During stable idle, screw in throttle air circulation bolt. After a short deviation, idle speed should re-adjust itself.
  3. To check the activation of the idle actuator by the control unit, connect a new or proper functioning idle actuator to the plug connector. Turn on ignition. The idle actuator should vibrate due to frequency activation.
  4. 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.
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