Ignition System: Inspection

INSPECT SPARK PLUG
NOTE:
- Never use a wire brush for cleaning.
- Never attempt to adjust the electrode gap on used spark plug.
- Spark plug should be replaced every 192,000 km (120,000 miles).
1. Clean the spark plugs.
  Air pressure:
  
  Below 588 kPa (6.0 kgf/cm ² , 85 psi)
  
  Duration:
  
  20 seconds or less
  
  Fig 1: Cleaning Spark Plugs
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check the spark plug for any damage on its thread and insulator.
  HINT:
  
  If damaged, replace the spark plug.
  
  Recommended spark plug:
  
  DENSO made:
  
  SK16R11
  
  NGK made:
  
  IFR5A11
3. Check the spark plug electrode gap.
  Electrode gap:
  
  1.0 to 1.3 mm (0.039 to 0.051 in.)
  
  Fig 2: Checking Spark Plug Thread And Insulator
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 3: Checking Spark Plug Electrode Gap
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002