D21 Hardbody 2WD L4-2389cc 2.4L SOHC MFI (KA24E) (1990)
Spark Plug: Testing and Inspection
Spark Plug Inspection
1.
Inspect the spark plugs for:
^
Improper gap
^
Carbon deposits
^
Cracked center electrode insulator
^
Burned or worn electrodes (may be caused by):
^ Excessive mileage
^ Lean fuel mixture
^ Advanced ignition timing
^ Loose spark plug
^ Plug heat range too high
^ Insufficient Cooling
^
Fouled plug (may be caused by):
^ Rich fuel mixture
^ Retarded ignition timing
^ Oil in combustion chamber
^ Incorrect spark plug gap
^ Plug heat range too low
^ Excessive idling/low speed running
^ Clogged air cleaner element
^ Deteriorated ignition coil, coil wire or ignition wires
2.
Replace the plug if the center electrode is rounded.
Standard Type
ZFR5E-11 (NGK)
Hot Type
ZFR4E-11 (NGK)
Cold Type
ZFR6E-11 (NGK)
Spark Plug Gap
3.
Adjust the gap with a suitable gapping tool.
Electrode Gap:
0.039 - 0.043 in. (1.0 - 1.1 mm)