Note: firm "Mitsubishi" recommends replacing spark plugs with platinum or iridium electrodes every 90,000 km of the car, ordinary candles - every 45,000 km. However, taking into account the quality of gasoline in the CIS countries, it is recommended to replace the spark plugs after their actual failure.
1. Removing spark plugs.
A) (GDI engines) Remove the decorative engine cover.
b) Disconnect the wiring connectors from the ignition coils.
V) (MPI motors) Disconnect the high voltage wires from the spark plugs and remove the spark plug guide tubes with ignition coil assemblies.
Attention: when removing and installing high voltage wires, you must hold only the rubber tip of the wire, and not the wire itself. Improper handling of high voltage wires can cause internal wire breaks.
Note: before removing the wires, mark their relative position so as not to confuse them during installation.
G) (GDI engines) Remove the spark plug guide tubes with ignition coils as an assembly.
d) Use a clean rag to remove debris from around the spark plugs that may have fallen into the spark plug mounting holes.
e) Using a spark plug socket, remove the spark plugs from the cylinder head.
2. Check for burnt electrodes or damage to the spark plug insulator. In addition, check the absence of significant deposits on the central electrode, damage or cracks in the sealing washer, as well as the condition of the enamel of the insulator at the end of the candle. Replace spark plugs if necessary.
3. (Spark plugs for MP1 engines) If soot is present (black electrodes), then remove it with a wire brush or a spark plug cleaner (sandblasting). Use compressed air to clean the threaded part of the spark plug from sand.
4. (Spark plugs for GDI engines) Spark plug electrodes used in GDI engines darken even when the ignition system is working properly. However, this is not a sign of a malfunction, as the soot covering the electrodes burns faster when this type of plug is used compared to conventional spark plugs. To check that the spark plug is working properly, measure the resistance of the spark plug insulator. If the measured value is less than the limit, replace the spark plug.
Maximum allowable value - 1 MΩ
5. Using a spark plug feeler gauge, check that the gap between the spark plug electrodes is within the nominal range.
Rated value:
- Motor MPI 1.0 - 1.1mm
- Engine GDI 0.5 - 0.7mm
Recommended spark plugs:
Engine 4G15-GDI:
- NGK (type 1) — BKR5EKUC
- NGK (type 2) — IZFR5B
Engine 4G93-GDI:
- NGK (type 1) — BKR6EKUC
- NGK (type. 2) — IZFR6B
MPI motors:
- NGK BKR5E — 11
- NIPPON DENSO — K16PR-U11
- CHAMPION — RC10YC4
Note:
- Spark plug marking NGK (or Nippon Denso): first character "I" or "S" means a spark plug with iridium electrodes; second character "Z" in the marking of a spark plug, NGK means a spark plug with a protruding spark gap.
- Symbols "EKUC" in the NGK spark plug marking, it means a special two-electrode spark plug for GDI engines.
- Firm "Mitsubishi" recommends using Type 1 spark plugs in GDI engines. Type 2 spark plugs are an alternative.
Spark plugs for MPI engines.
Spark plugs for GDI engines, type 1 (two-electrode).
Spark plugs for GDI engines, type 2 (single electrode).
Attention: For spark plugs with platinum or iridium electrodes:
- Replace the spark plug if the clearance limit is exceeded.
- Do not attempt to adjust the gap on these spark plugs.
- Cleaning these spark plugs can damage the electrode coating. Therefore, use a spark plug cleaner to remove carbon deposits and completely clean the spark plug within 20 seconds or less to avoid damaging the electrode coating. Do not use a wire brush.
8. (Spark plugs for MPI engines) If the gap does not correspond to the nominal value, adjust it by bending the side electrode.
9. Installation of spark plugs.
A) Clean the spark plug mounting holes.
Caution: Be careful not to allow foreign particles to enter the engine cylinder through the spark plug hole.
b) Install and tighten the spark plugs to the specified torque.
Tightening torque - 25±5 N·m
V) If necessary, apply silicone grease to the spark plug insulators.
G) Install the spark plug guide tube assembly with the ignition coils and tighten their mounting bolts to the specified torque.
Tightening torque - 10 + 2 Nm
d) (MPI engine) Connect the high voltage spark plug wires securely to the spark plugs.
e) Connect the wiring connectors to the ignition coils.
and) (GDI engines) Install the decorative engine cover and pre-tighten the engine mounting bolts in the order shown in the figure so that the cover can be moved by hand. Tighten the mounting bolts to the rated torque in the order shown in the figure.
Tightening torque - 3 Nm
Engine 4G15-GDI
Engine 4G93-GDI.