Warm up the engine.
Adjusting screw 1 for the amount of the mixture, set the crankshaft speed within 900±50 rpm.
Remove the plugs from the exhaust manifolds and screw in sensors 13 0 020 instead.
Attach a gas analyzer and check the carbon monoxide content (SO) in the exhaust gases in each exhaust manifold.
Remove, if necessary, the plug of the quality adjusting screw 2 (composition) mixture and, turning it with the key 13-1-018, achieve the proper CO content in the exhaust gases. To increase the CO content in the exhaust gases, screw 2 should be turned clockwise, and to decrease it counterclockwise.
Each time after turning the screw 2 it is necessary to remove the key and briefly press the accelerator pedal.
At the end of the adjustment, put a new plug in the hole for adjusting screw 2 of the mixture quality.