Mirage L4-1468cc 1.5L SOHC 12 Valve (1996)
Spark Plug: Testing and Inspection
Inspection
1. Check the following items to see that electrodes are not burnt, and insulators are not broken, and how porcelain insulator is burnt.
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Broken insulators
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Wearing electrodes
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Deposited carbon
For cleaning, use a plug cleaner or wire brush. Clean porcelain insulator above shell as well.
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Damaged or broken gasket
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Burnt condition of porcelain insulator at spark gap Dark deposit of carbon indicates too rich a fuel mixture or extremely low air intake. Also,
misfiring due to excessive spark gap is suspected.
White burn indicates too lean a fuel mixture or excessively advanced ignition timing. Also insufficient plug tightening is suspected.
2. Clean with a plug cleaner.
Use an air gun to remove dust deposited on plug threads.
3. Check plug gap using a plug gap gauge and adjust if it is not as specified.
Standard value: 1.0 - 1.1 mm (0.039 - 0.043 in.)
