1. Check distributor installation (initial ignition timing).
2. Disconnect the vacuum regulator pipe.
3. Connect a stroboscope to the ignition wire of cylinder 1, as well as a tachometer.
4. use point "0" on the adjusting plate as a reference point. Check advance angle in degrees according to specification.
5. If the measured values do not correspond to the required ones, then the distributor should be checked on the stand.