Component Tests and General Diagnostics
SPARK PLUG INSPECTIONSpark Plug Inspection:
specification
Plug Gap Inspection
CAUTION:
- To avoid possible damage to the tip, do not adjust the plug gap.
- To prevent damaging the tip, use a wire type plug gap gauge when inspecting the plug gap.
1. Measure the spark plug gap using a wire type plug gap gauge.
- If it is more than the maximum specification, replace the spark plug.
Standard plug gap
1.15-1.25 mm (0.046-0.049 in)
Maximum plug gap
Leading side: 1.5 mm {0.059 in}
Trailing side: 1.4 mm {0.055 in}
Cleaning
CAUTION: To avoid possible damage to the tip, do not use a wire brush for cleaning.
NOTE: To avoid possible damage to the tip, use gasoline to clean the spark plugs after removing dirt.
Visual inspection
1. Inspect the following items:
- If any of following malfunctions are indicated, replace the spark plug.
- Insulator breakage
- Worn electrode
- Damaged gasket
- Badly burned insulator (sparking side)
Resistance Inspection
1. Measure the resistance of the spark plug using a tester as shown in the figure.
- If not within the specification, replace the spark plug.
Resistance
3.0-7.5 kilohms [25 °C (77 °F}]