Note: Idle speed, CO content and ignition timing are checked and adjusted together. During checks, the lambda probe is turned off.
Test condition: The exhaust system must be tight.
Warm up the engine, the oil temperature is at least 80 degrees.
Turn off all electrical consumers, including the air conditioner.
If the injection pipes have been loosened or changed, before checking the engine, increase the engine speed to 3000 rpm and then let the engine run at idle speed for at least 2 minutes.
Attention: Connect instrumentation only with the ignition off.
Check ignition timing.
Verify that the idle speed control valve is operating. To do this, turn on the ignition and put your hand on the valve. It should vibrate and its buzzer should be heard. The valve is located next to the throttle valve.
Disconnect the crankcase ventilation hose from the air filter and close the hole in the fitting with a plug.
If present, close the upper valve with a suitable clamp (from activated charcoal tank) at the air filter.
Connect the RPM meter and stroboscope according to their operating instructions. Attention: when doing this, the ignition must be switched off.
Connect the hose of the CO tester through the threaded fitting to the special fitting in the filling pipe on the left -arrow-. Attention: screw the threaded end tightly.
Ignition off, disconnect connector -1- for lambda probe and connector -2- for idle speed control control valve.
Attention: When carrying out inspection and adjustment work, the radiator fan must be switched on.
Check engine speed and CO content and, if necessary, adjust the idle speed adjusting screw -1- and CO content adjusting screw -2- by alternating rotation. If the adjusting screws are sealed, drill through the cap seals and screw in the self-tapping screws. Tighten the self-tapping screws together with the caps.
| Engine index | CO content % | RPM |
| MV, SS | 0,7±0,4 | 880±50 |
Connect the lambda probe connector and the idle speed control control valve connector to each other.
Leave the engine to idle for approximately 2 minutes. The CO content should remain within 0.7±0.4%.
Check the function of the lambda probe. To do this, disconnect hose -1- from pressure regulator -2- and close hose. The CO content should briefly rise and then fall (regulation process).
After adjustment, seal the CO content adjustment screw with a blue cap.
Connect the crankcase ventilation hose to the air filter.
Caution: If this increases the CO content, the cause is not an incorrect adjustment, but the ejection of crankcase waste due to oil dilution during operation, mainly in short sections. After repeated trips over long distances, the proportion of fuel in oil and the CO content in the exhaust are normalized. You can also achieve faster with about 30 minutes of high speed driving by changing the oil.
Disable control devices with the ignition off. Connect all disconnected hoses and electrical wires.
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