You will need: a 10 mm spanner, a special 16 mm spark plug spanner, and a special feeler gauge.
Note: The spark plug wrench must be equipped with a rubber bushing or magnetic insert to hold the spark plug, otherwise it will be quite difficult to remove the spark plug from the spark plug well.
1. Open the hood and remove the decorative engine cover (see "Removing and installing the decorative engine cover").
2. Press the latch..
3. …and disconnect the wiring harness connector from the ignition module.
4. Remove the bolt securing the ignition module to the cylinder head cover…
5. …and remove the ignition module from the spark plug well.
6. Unscrew the spark plug with a special key…
7. …and remove it from the spark plug well.
Note: If you are unable to remove the spark plug with the key, you can do this using the ignition module by placing its tip on the spark plug insulator and pulling them out of the spark plug well.
Note: Inspect the spark plug and assess its condition by its appearance (see "Diagnostics of engine condition by the appearance of spark plugs").
8. Clean the spark plug from dirt using a sandblasting machine with fine-grained abrasive material.
Caution! Do not clean spark plugs with a hard metal brush to avoid the appearance of fine metal dust on the ceramic insulator of the central electrode, which can cause spark leakage.
Original posted on the website LadaMan
9. Check the gap between the spark plug electrodes with a round feeler gauge (see appendix 4).
10. If the gap differs from the recommended value, adjust it by bending the side electrode to a larger…
11. …or the smaller side.
Attention! Adjust the gap only by bending the side electrode. Any bending of the central electrode will result in failure of the spark plug insulator.
12. When installing spark plugs, screw them in by hand first (without a collar), and then tighten with a wrench. Do not exceed the tightening torque specified in Appendix 1.