Caution: The idle speed, CO content and ignition timing must be checked and set together. The idle speed cannot be adjusted. The idle speed adjusting screw must be fully tightened. The screw is varnished and must not turn. The speed control is carried out exclusively by idling stabilization. Starting from 3.88 the screw is not provided.
Remove the crankcase breather hose. Plug the air outlet tube with the stopper of the measuring pipe CO.
Connect an ammeter to the electro-hydraulic regulator.
Start the engine and let it idle.
Check operation of the throttle switch and throttle position sensor idle contacts. To do this, briefly raise the speed to 4000 rpm and close the throttle manually (release the pedal). In this case, the measuring device should show minus 50-60 mA for a short time. If a positive value is displayed, swap the meter cables. If there is no current, check the idle contacts.
Test location 1000 m below sea level
Check the current readings: it should be 0±3 mA, while the CO content should be 0.3-1.2%.
Otherwise, remove the plug of the adjusting screw CO and adjust the control current to 0±1 mA. Adjustment as for the 90 hp engine.
Test location 1000 m above sea level
Disconnect connector from lambda probe (green wire).
Let the engine run at idle. Measure and record the control current at the electro-hydraulic controller in mA. Its value is the correction value of the height sensor.
Connect the plug of the lambda probe and measure the control current again. If the new value differs from the previously recorded value by more than±3 mA, the CO content must be adjusted by changing the control current.
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