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Home >> Porsche >> 1989 >> 928 CS V8-4957cc 5.0L >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Pinpoint Tests >> LH Test Points (Fuel Injection) >> Test Point 21 - Alternator, Regulator
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Test Point 21 - Alternator, Regulator

Engine misfire may be caused by alternator voltage peaks.

- Remove the drive from the alternator and start the engine.
- If this eliminates the fault, check the alternator and regulator.
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