Spark Plug: Testing and Inspection

1. For H25 engine, remove surge tank cover.
2. Disconnect injector coupler.

WARNING: Without disconnection of injector coupler, combustible gas may come out from spark plug holes during this test and may get ignited in engine room.

3. Remove spark plug and check it for condition and type, referring to "Spark Plug" under "On-Vehicle Service".
4. If OK, connect ignition coil coupler to ignition coil assembly and connect spark plug to ignition coil assembly. Ground spark plug.
5. Crank engine and check if each spark plug sparks.
If no spark is emitted, inspect the related parts as described under "Diagnosis By Symptom".

6. After checking, install spark plug, referring to "Spark Plug" under "On-Vehicle Service".
7. Connect injector coupler.
8. For H25 engine, install surge tank cover.




Inspect them for electrode wear, carbon deposits and Insulator damage.

If any abnormality is found, adjust air gap, clean with spark plug cleaner or replace them with specified new plug.

Spark plug air gap "a": 1.0 - 1.1 mm (0.039 - 0.043 in.)
Spark plug type:

For J20 Engine
DENSO SK16PR11/PK16PR11
NGK IFR5G11/IPFR5G-11

For H25 Engine
DENSO K20PR-U11/*SK16PR11/*PK16PR11
NGK BKR6E11/*IFR5G11/*PFR5G-11

NOTE: Under -25 °C (-13 °F), the spark plugs with an asterisk (*) are highly recommended for better engine starting performance.