Cars with gasoline engines
Necessary tools and equipment: 16 mm spark plug wrench.
To replace worn parts, you will need: spark plugs of the appropriate specification.
Removal
The engine should be cold or slightly warm.
Cars with 16-valve engine (2.0 liters)
1. Remove the stiffening arm secured above the upper shock absorber strut mounts.
2. Unscrew bolts 1 and 2 that secure the upper engine protective cover (see illustration).
9.2 Unscrew bolts 1 and 2 that secure the upper engine protective cover
3. Unscrew the seven bolts securing the ignition coils 2 and remove the coils (see illustration).
9.3 Unscrew the seven bolts securing the ignition coils 2 and remove the coils
4. Cars with a 1.4-/1.6-liter gasoline engine (K4J/K4M). Disconnect the ignition coils.
5. All models except K4J/K4M. Remove the high-tension wire caps from the spark plugs (see arrows in the illustration). When removing terminals, pull on the terminals, not the wires.
9.S Remove the high-voltage wire tips from the spark plugs (see arrows). All models except K4J/K4M
6. Unscrew the spark plugs with a spark plug wrench and inspect them. With some experience, the appearance of the spark plug can be used to judge the condition of the engine.
If the electrodes and insulator are dark gray or light brown, this indicates normal operation of the engine and spark plug. If they are black, the fuel-air mixture is too rich. Light gray color of the electrodes and insulator of the spark plug indicates a lean fuel-air mixture supplied to the combustion chambers. If the spark plugs are covered with oil, there is a misfire or poor condition of the piston rings. In this case, the compression should be checked.
7. Check the spark plug insulators for leakage currents. Leakage currents appear as thin, uneven marks on the spark plug surface. In this case, replace the spark plug and check the tightness of the high-voltage wire tip on the spark plug. Replace the tip if necessary.
Installation
8. Clean the spark plug threads with a clean rag.
9. Screw in the spark plugs by hand until they touch the cylinder head.
Caution! Do not allow the spark plugs to become skewed.
10. Tighten the spark plugs with a spark plug wrench to a torque of 25 Nm.
Caution! If you do not have a torque wrench, tighten the new spark plugs with a spark plug wrench by about 1/4 turn. Tighten the old spark plugs in the same way, but only by about 15°. Spark plugs that are too tightly tightened may break when unscrewed, or the thread of the spark plug hole on the cylinder head may be damaged. If the thread is damaged, use a UTC or Heli-Coil repair kit.
11. All models except K4J/K4M: Place the high tension wire caps on the spark plugs.
[Original publication on the website RenaultBook.ru]
12. Cars with a 1.4-/1.6-liter gasoline engine (K4J/K4M). Install the ignition coils,
13. Vehicles with 16-valve engine (2.0 liters): Reinstall the ignition coils, upper engine cover and stiffener arm between the upper shock absorber mounts.