Component Tests and General Diagnostics

Inspection Of Spark Plug:

1. Check the following items to see that electrodes are not burnt, and insulators are not broken. and how porcelain insulator is burnt.
^ Broken insulators
^ Wearing electrodes
^ Deposited carbon
For cleaning, use a plug cleaner or wire brush. Clean porcelain insulator above shell as well.

Inspection Of Spark Plug:

^ Damaged or broken gasket.
^ 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:
<1.8L Engine, 2.0L DOHC Engine (Non-Turbo)>
1.0-1.1 mm (.039-.043 in.)

<2.0L DOHC Engine (Turbo)>
0.7-0.8 mm (.028-031 in.)