On-Vehicle Inspection - Toyota 4-Runner 1985 Repair Manual

IG-4 IGNITION SYSTEM - On-Vehicle Inspection
ON-VEHICLE INSPECTION
SPARK TEST
NOTE: Perform this test to check that current is coming
from the distributor.
1. CONNECT TIMING LIGHT TO EACH SPARK PLUG
2. CRANK ENGINE AND CHECK THAT LIGHT FLASHES
If the timing light does not flash, check the wiring connec-
tions, ignition coil, igniter, distributor or ignition switch.
INSPECTION OF HIGH TENSION CORD
1. CAREFULLY REMOVE HIGH TENSION CORDS BY
RUBBER BOOT
CAUTION: DO NOT pull on or bend the cords to avoid
damaging the conductor inside.
2. INSPECT CORD TERMINALS
Check the terminals for corrosion, breaks or distortion.
Replace cords as required.
3. CHECK CORD RESISTANCE
Using an ohmmeter, check that the resistance does not ex-
ceed the maximum. Replace cords as required.
Maximum resistance: 25 kQ per cord
INSPECTION OF SPARK PLUGS
1. REMOVE SPARK PLUGS
2. CLEAN AND INSPECT SPARK PLUGS
(a) Clean the spark plugs with a spark plug cleaner or wire
brush.
(b) Inspect the spark plugs for electrode wear, thread
damage and insulator damage.
If a problem is found, replace the plugs.
Spark plug: NO W16EXR-U
NGK BPR5EY
3. ADJUST ELECTRODE GAP
Carefully bend the outer electrode to obtain the correct elec-
trode gap.
Correct electrode gap: 0.8 mm (0.031 in.)
4. INSTALL SPARK PLUGS