Adjusting the content of carbon monoxide (CO) in exhaust gases ZMZ-406

The adjustment is made on a warm engine (coolant temperature 80-90 ° C) with a working ignition system and nominal gaps between the spark plug electrodes

The content of CO and CH in the exhaust gases should be within: 0.7-0.9% CO and 1200 ppm1 CH at a crankshaft speed of (800+50) min 1 no more than 0.5% CO and 600 ppm1 CH at an engine speed of (3,150+50) ppm1.

Adjustment of carbon monoxide (CO) content in the exhaust gases of GAZ-2705

If the CO content is above the specified limits, adjust the CO content with screw 1 on the mass air flow sensor.

Turning the screw clockwise increases the CO content, while turning it counterclockwise decreases it.

This will also adjust the CH content.

If it is not possible to adjust the content of CO and CH within the specified limits, it is necessary to check the serviceability of the elements of the integrated microprocessor-based engine control system.