Spark plug is one of the simplest part of the engine.
Its only functionality is to ignite the fuel and air mixture.
The voltage generated by the high-voltage ignition system of the car is placed on the middle electrode of the spark plug.
The body surface electrode is in electric contact with the engine body.
The spark through the air gap between the two electrodes is conducted on the body surface electrode to the cylinder head of the engine.
The spark plug becomes worn with time.
The body surface electrode becomes thinner, the insulation can be burnt etc.
A worn spark plug can cause higher fuel consumption, lower performance... That is why is needed the spark plug change regularly.
What you need:
- 4 spark plugs
- a coin (e.g. 10 cent)
- 10 mm fork wrench
- 16 mm plug wrench or pipe wrench
- about 30 min.
7. Repeat these steps for all of the four cylinder and put the engine parts to their places.