2. Turn off the ignition and connect the MUT-II device to the diagnostic socket.
3. Check the basic setting of the ignition timing, which must correspond to the nominal value.
Setting the ignition timing: 5°±3°to TDC
4. Start the engine and for 2 minutes increase the engine speed to 2500 rpm-1.
5. Install the gas analyzer probe (CO and CH) into the exhaust pipe.
6. With the engine idling, measure the concentrations of CO and CH, which must correspond to the nominal values.
- CO concentration: no more than 0.5%;
- CH concentration: not more than 100 ppm
Note. These checks must be performed within 4 minutes after the engine has been idling.
Valid values:
- CO concentration: no more than 0.5%
- CH concentration: not more than 100 ppm
7. If CO and CH concentrations are not within acceptable limits, check the following:
- diagnostic codes,
- fuel pressure;
- fuel injectors;
- coil and spark plugs;
- EGR system and valve;
- fuel vapor recovery system;
- compression in the engine cylinders
Note. If the CO and CH concentrations are not within acceptable limits even with all positive checks, replace the three-way catalytic converter.