Spark Plug Inspection: Test

How to use this service information .

1. Spark Plug - Inspect

   Preconditions 

   • Spark Plug Removed - Refer to: Cylinder Head Cover Area (2.0L Engine) (2024 2025) or Cylinder Head Cover Area (1.5L Engine)

   Procedure/Specifications 

   NOTICE: 

   • Do not adjust the gap or clean the spark plug with a wire brush since this will damage the electrode.
   • Replace the spark plug when prompted by the maintenance minder or according to the maintenance schedule.
   • If an abnormality is suspected, replace the suspected spark plug from another cylinder and recheck.

   Specifications 

   Standard Value (New)
   a	0.70-0.75 mm (0.0276-0.0295 in)

   Specifications 

   Position	Item	Specification
   b	Worn or deformed electrodes Improper gap Oil-fouling Carbon deposits Cracked center electrode insulator	Inspection items is normal
   c	Damaged gasket
   d	Cracked insulator

   Courtesy of HONDA, U.S.A., INC.

   • Burned or worn electrodes may be caused by these conditions:
   • • -

       Advanced ignition timing

     • -

       Loose spark plug

     • -

       Plug heat range too hot

     • -

       Insufficient cooling

   • Fouled plugs may be caused by these conditions:
   • • -

       Retarded ignition timing

     • -

       Oil in combustion chamber

     • -

       Incorrect spark plug gap

     • -

       Plug heat range too cold

     • -

       Excessive idling/low speed running

     • -

       Clogged air cleaner element

     • -

       Deteriorated ignition coils

   Result 

   • If it is abnormal, replace the spark plug.