IG-2 IGNITION (2JZ-GTE) - IGNITION SYSTEM 2. INSPECT SPARK PLUGS NOTICE: ♦ Never use a wire brush for cleaning. ♦ Never attempt to adjust the electrode gap on used a spark plug. ♦ Spark plugs should be replaced every 100,000 km (60,000 miles). (a) Remove the ignition coils assemblies. (See page IG-6 ) Megger Ground IG0147 (b) Inspect the electrode. Using a megger (insulation resistance meter), measure the insulation resistance. Standard correct insulation resistance: 10 MΩ or more If the resistance is less than specified, proceed to step (c). HINT: If a megger is not available, the following simple method of inspection provides fairly accurate results. N00917 Simple Method: ♦ Quickly race the engine 5 times to 4,000 rpm. ♦ Remove the spark plug. ♦ Visually check the spark plug. If the electrode is dry ... OK If the electrode is wet ... Proceed to step (d). ♦ Reinstall the spark plug. (c) Using a 16 mm plug wrench, remove the 6 spark plugs. (d) Visually check the spark plug for thread damage and insulator damage. If abnormal, replace the spark plug. Recommended spark plug: DENSO made | PK20R11 NGK made | BKR6EP11 1.1mm IG0317 IG0151 Z00032 (e) Inspect the electrode gap. Maximum electrode gap for used spark plug: 1.3 mm (0.051 in.) If the gap is greater than maximum, replace the spark plug. Correct electrode gap for new spark plug: 1.1 mm (0.043 in.) NOTICE: If adjusting the gap of a new spark plug, bend only the base of the ground electrode. Do not touch the tip. Never attempt to adjust the gap on the used plug. 1997 SUPRA (RM502U) Author : Date : 1496