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Home >> Porsche >> 1985 >> 928 Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - BOSCH LH >> Testing >> Test 10 >> Octane Loop
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Octane Loop

The ignition performance graph can be retarded approximately 3° via a plug connection on the EZF control unit plug. This way the engine can use lower octane gasoline. Standard is with plug disconnected. With the plug connected ignition timing should be minus 3° at full load or high partial load.