Ignition System
Spark Plug Inspection
1. Inspect the electrodes and ceramic insulator for:
Worn or deformed
electrodes
Damaged
gasket
• Improper gap
• Oil-fouling
• Carbon deposits
• Cracked center
electrode insulator
Cracked
insulator
Burned or worn electrodes may be caused by:
• Advanced ignition timing
• Loose spark plug
• Plug heat range too low
• Insufficient cooling
Fouled plug may be caused by:
Retarded ignition timing
Oil in combustion chamber
Incorrect spark plug gap
Plug heat range too high
Excessive idling/low speed running
Clogged air cleaner element
Deteriorated ignition coil
2. Replace the plug if it is fouled or worn.
NOTE: Do not use spark plugs other than those
listed below.
Spark Plug:
PFR6N-11 (NGK)
PK20PR-L11 (Nippondenso)
3. Make sure that the 1.3 mm (0.051 in) plug gauge
does not go into the gap for the platinum tip plug. If
the gauge goes into the gap, do not attempt to ad-
just the side electrode; replace the plug with a new
one.
Electrode Gap:
Platinum tip plug:
Check and confirm that the
1.3 mm (0.051 in) plug
gauge does not go into the
gap.
Anti-seize compound
applied to threads
4. Screw the plugs into the cylinder head finger-tight,
then torque them to 18 N-m (1.8 kg-m, 13 Ib-ft).
NOTE: Apply a small quantity of anti-seize com-
pound to the plug threads before installing each
plug.ProCarManuals.com
Ignition system
Component Location Index
IGNITION TIMING CONTROL SYSTEM
Troubleshooting, section 11Inspection and setting, page 23-91
Description, page 23-89
RADIO NOISE CONDENSER
Test, page 23-97
SPARK PLUGS (6)
Inspection, page 23-96
TACHOMETER CONNECTOR
(Engine revolution detected)
CYL/CRANK SENSOR
Troubleshooting, section 11 Replacement, section 5
IGNITION COILS (6) Removal, page 23-94 Test, page 23-95
IGNITER UNIT
Replacement, page 23-92Input Test, page 23-93 Troubleshooting, Section 11
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