Warm up the engine to operating temperature.
Turn on high beam headlights (cooling fan should not work).
Bring the engine to idle, if necessary, refine the idle speed adjustment.
Carbon monoxide regulation (SO) in exhaust gases
Measure the CO content in the exhaust gases at idle and, if necessary, adjust the screw located between the dispenser-distributor and the connecting air duct of the air flow meter, having previously removed the plug.
Turning the screw clockwise increases the CO content and vice versa.
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