Idle speed adjustment (Pierburg 1B3) (Audi 100 C3)

The adjustment is carried out on a warmed-up engine with adjusted clearances in the valve drive mechanism and ignition timing.

Execution order

1. Connect a control tachometer and gas analyzer to the engine in accordance with the manufacturer's instructions.



2. With the mixture quantity adjustment screw (indicated by the arrow) set the crankshaft speed within (750±50) min⁻¹.



3. Adjusting screw for mixture quality (composition) (indicated by the arrow) set the level of carbon monoxide (CO) in the exhaust gases to no more than 1.0 (±0.5)%. Check and, if necessary, adjust the idle speed, and then again the CO content in the exhaust gases.

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