Switch on the ignition and check for control current. Otherwise, measure the resistance of the regulator. Should be 17.5-21.5 ohms.
Connect the CO measuring device to the measuring socket in the engine compartment. The measuring tube is welded to the intake tube of the muffler and usually closed with a blue cap.
Caution: Push the hose of the measuring device tightly onto the measuring socket. Make sure there are no leaks in the exhaust system.
Start the engine and let it idle.
Attention: The radiator fan must not run during the check and adjustment work.
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Check the number of revolutions. Rated value 800-1000 rpm. If there is a deviation, adjust the speed to 900+30 rpm. adjusting screw -A-.
Check control current. Its value must be between 4 and 16 mA.
Check the CO content with a special device. Nominal value: 0.3-1.2% of volume.
Attention: If the CO content exceeds 1.2% with a control current of 4-16 mA, external causes should be looked for. For example, the ignition system is faulty or misadjusted, the exhaust system is loose, the injection valves are loose or loose, the fuel dispenser is faulty and because of this, a different amount of fuel at idle.
If the control current lies outside the allowed range. adjust it even if the CO content is normal.
Remove the plug of the CO adjustment screw. Why drill a 265 mm plug with a drill, and then screw a 3 mm self-tapping screw into the plug and remove it together with the plug using pliers.
Set the control current to 10 mA with the adjusting screw CO -B-. This will require a 3 mm long key.
Attention: When adjusting CO, do not press or lift the adjusting screw with a wrench. With the key inserted, do not give gas. After each operation, remove the adjusting key and briefly apply gas before reading the control current and the CO content.
Recheck the idle speed and measure if required.
Push the crankcase breather hose onto the cylinder head and secure with a clamp.
Attention: If the CO content now increases, this is not due to incorrect CO adjustment, but due to the enrichment of the mixture from the crankcase due to dilution of the oil by gasoline during short trips in cold weather.
During a long trip, the fuel content in the oil decreases and CO normalizes. This can be achieved quickly with a 30-minute drive or an oil change.
Put on the cover of the activated charcoal box.
Disable gauges with ignition off.
Reattach all removed hoses.
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