Adjustment Of Ignition Timing - Mazda 121 Workshop Manual

SCHEDULED MAINTENANCE SERVICES
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ATUUSTMENT OF IGNITION TIMING
Preparation
1. Warm up the engine to normal operating temperature.
2. Verily that the wax rod extends outward fully and the idle
cam separates from the roller.
3. Turn all electric loads OFF.
. Blower Fan
. Headlight
. Rear Window Defroster
4. lvlake sure that the engine speed does not change when
disconnecting the air bypass solenoid valve @ connector'
Note
. I the engine speed decreases, the engine is still u]}
der the warm-up condition.
5. lf the electric cooling fan is operating, waittillthe tan stops.
6. Verify thal the engine is running at idle in good condition.
7. Connect the SST to the diagnosis connector.
8. Connect a timing light.
9. Connect a tachometer to the diagnosis connector lG- ter'
minal as shown.
10. Set switch @ to Position 1.
11. Set TEST SW to SELF TEST.
Note
. lf the SST is not used, iump across the TEN lermi'
nal and the GND terminal gl the diagnosis con'
nector.
lgnition Timing
Inspeclion / Adiustment
1. Check that the idle speed is within the specification.
ldle speed: MTX (Neutral) ?50 :l! rPm
ATX (P range) 1,100 i'! rpm
2. Check the ignjtion timing with a timing light
lgnition timing: BTDC 16 + | "
3. lf the ignition timing is not within the specification, loosen
the distributor lock bolts and turn the distributor to make
the adiustment-
4. Tiqhten the distributor lock bolts to the specilied torque.
Tiohteninq toloue:
ie-zsI{m
(i.6-2.3 m-kg, 12-16 ftlb)
5. Put a seal on the distributor lock bolt
ACHOMETEF
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