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Home >> Porsche >> 1987 >> 928 Standard >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - BOSCH LH >> Testing >> Test 7 - Throttle Switch (Idle Contact)
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Test 7 - Throttle Switch (Idle Contact)

  1. Pull off both EZF and LH fuel control unit plugs. Connect ohmmeter to terminal No. 4 of disconnected EZF ignition control unit plug. With throttle closed, reading should be from zero ohms to a maximum of 10 ohms. With throttle opened, reading should be infinity. Idle contact must open immediately.
  2. Opening the idle contact should advance ignition timing by approximately 10°. If not, check for open circuit or defective idle switch.
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