Caution: Fine adjustment of the idle mixture can only be made using a fuel analyzer. The idle exhaust composition adjusting bolt 45 changes the height of the fuel distributor piston relative to the air flow control plate in the air flow meter. The screw is accessible after removing the blocking plug between the air cacao outlet and the fuel distributor on the air mass meter housing. Although it is recommended to use a special tool to make this adjustment, it can be done with a long, thin screwdriver.
1. The engine must operate under the same conditions as when adjusting the idle speed. The rotation speed should be normal.
2. Connect an exhaust gas analyzer to the exhaust pipe according to the analyzer manufacturer's instructions and calculate the carbon monoxide content of the exhaust gases.
3. To increase the content of carbon monoxide in the exhaust, rotate the adjusting bolt clockwise, to decrease - counterclockwise. During adjustment, do not press the adjusting bolt, as this may cause the plate of the flow meter sensor to move and affect the adjustment.
4. Remove the tool and briefly increase the engine speed.
5. Recheck the carbon monoxide setting.
Caution: If the tool used to turn the mixture screw is not removed before the engine is accelerated, it may become pinched and bent.
6. Recheck idle speed and adjust if necessary.
7. If, after connecting the flexible pipe for removing air from the main crankcase, the content of carbon monoxide in the exhaust gases has increased, this indicates the dilution of the oil with fuel and the need to change the oil. If an oil change is not possible, the second way to remove oil from the fuel is to drive the car for a long time. The fuel content in the oil is the greater, the larger the gaps between the piston and the cylinder, which indicates engine wear.
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