Mitsubishi Lancer Evolution IV, Workshop Manual

Page: 105 / 391

ENGINE ELECTRICAL –
Ignition System
16-4
IGNITION SYSTEM
ON-VEHICLE SERVICE
1. IGNITION COIL WITH BUILT-IN POWER TRANSISTOR CHECK
Secondary coil resistance measurement
Standard value: 15 – 21 k
Ω
2. SPARK PLUG CHECK, CLEANING, AND REPLACEMENT
Check the plug gap and replace if the limit is exceeded.
Caution
(1) Do not attempt to adjust the gap of the platinum plug.
(2) Cleaning the platinum plug can damage platinum tips. If a cleaning is needed, use a plug
cleaner and finish cleaning within 20 seconds to protect the electrodes. Never use wire brushes.
Standard values and limits:
Manufacturer Model Standard value (mm) Limit (mm)
NGK PGR7A 0.7 – 0.8 0.95
DENSO P22PR8 0.7 – 0.8 0.95