2. Using the adjusting screw, set the engine idle speed in accordance with the regulatory requirements (see size and adjustment tables at the end of the Guide).
3. Check the duration of the closed state of the breaker contacts (see size and adjustment tables at the end of the Manual), if necessary, make adjustments - to reduce the duration, increase the gap in the contacts, and vice versa. To perform this check, the engine must be stopped, and the cover, rotor and screen of the distributor speed limiter removed.
4. Once the breaker contact duration adjustment is complete, shift the transmission to the "N" or "P" (AT) position and begin varying the engine speed from idle to 2000 rpm while watching the meter indicator. If there is a noticeable change in the meter readings, check the distributor shaft for excessive lateral play, assess the degree of cam wear, and check the condition of the breaker contacts. Replace defective components.
Note: After completing the procedures for replacing and/or adjusting the breaker contacts, be sure to check the ignition timing. There is no need to disconnect the distributor vacuum hoses when adjusting the ignition timing.
5. To check the ignition timing, start the engine and warm it up to normal operating temperature and leave it running at idle speed, which should meet the regulatory requirements (see size and adjustment tables at the end of the Guide).
Note. On models with automatic transmission, the ignition timing must be checked and adjusted with the gear selector lever in position "D". In this case, the throttle valve must not be opened under any circumstances, as the vehicle may move. Do not forget to check that the parking brake is securely engaged.
6. Turn on the stroboscope and make sure that the mark on the crankshaft pulley is opposite the 10° mark on the scale on the timing cover.
7. If necessary, adjust the installation by loosening the mounting bolt and turning the distributor accordingly.
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8. After completing the adjustment, tighten the distributor mounting bolt and, if necessary, adjust the engine idle speed. On models with automatic transmission, make sure that the transmission is moved back to the "P" position.
9. To check the proper functioning of the ignition timing adjustment mechanism:
- Disconnect the vacuum hose from the distributor;
- Gradually increase engine speed, observing the shift of the timing marks illuminated by the strobe light; if the corrector is functioning properly, the ignition timing should shift towards the advance as the revs increase, otherwise remove the distributor cap and turn the runner in the direction of normal rotation - when released, it should return to its original position;
- Keeping the engine speed at approximately 2000 rpm, carefully connect the vacuum hose to the distributor. If the vacuum corrector is functioning properly, the ignition timing should shift toward advance. Replace components if necessary.
10. Stop the engine and disconnect the diagnostic equipment.