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Home >> Porsche >> 1986 >> 928 Standard >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - BOSCH LH >> Description >> Testing Plug
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Testing Plug

A testing plug is mounted at the right hand side of the oil filler neck. Terminals "B" and "C" must be bridged with a jumper wire whenever engine speed is checked (by-passing idle stabilization system) or adjusted. Remove jumper wire afterwards. The oxygen sensor control can be checked with an analog dwell or voltmeter at terminals "A" and "C".