2. Stop the engine, connect the strobe according to the manufacturer's instructions. Check that the marks on the crankshaft pulley and timing belt housing are clear.
3. Disconnect the cooling fan motor.
4. Disconnect the vacuum hose from the ignition distributor and plug it.
5. Start the engine, let it idle for 2 minutes, accelerate to 2000-3000 rpm two or three times, then turn it to idle.
6. Check the idle speed.
7. Point the strobe light at the crankshaft pulley and check that the pointer is aligned with (or between) corresponding marks on the pulley (see Specifications and Fig. 4.10).
Pic. 4.10. Ignition timing marks on the crankshaft pulley
Note: TDC mark is black or orange, other marks are white
8. If adjustment is required, loosen the distributor mounting bolts and rotate the housing clockwise to increase advance or counterclockwise to decrease advance. After installation, tighten the bolts.
9. Increase engine speed. If the mark moves away from the pointer, this indicates that the centrifugal advance mechanism is working.
10. Connect the vacuum hose. Setting the ignition timing should advance (approximately 8°) after connecting the hose, indicating that the vacuum regulator is functioning.
11. If the centrifugal or vacuum correction system does not work properly, remove the distributor and rebuild it.
12. After adjustment, stop the engine, turn off the strobe light, and connect the cooling fan wiring.
Adjustment for use of premium unleaded gasoline
13. On most models (see Specifications) It will be necessary to reduce the ignition timing to 5°to prevent detonation and/or pre-ignition if the vehicle is fueled with Premium Unleaded Gasoline (95 RON).
Note: Detonation or pre-ignition may not always be detectable by ear.