Chrysler Conquest 1988 Service Manual page 157

IGNITION SYSTEM
- Service Adiustment Procedures
8-145
IGNITION SYSTEM INSPECTION
NOSGIDA
1. Inspection of Centrifugal Timing Device
(1) Set tachometer and timing~light.
(2) Set parking brake, start engine and run idle.
(3) Disconnect vacuum hose from vacuum controller.
(4) While slowly increasing engine speed, check timing
advance.
It is okay if timing advances smoothly as engine speed
increases,
Symptom Probable cause
Timing advance too large
Deteriorated governor spring
Timing advance too sharp Broken spring
Timing advance too small
or hysteresis too large
Governor weight or cam not
operating correctly
(5) If any of the above symptoms is observed, disassemble
and check distributor.
(6) After the check, turn ignition switch to "OFF".
(7) Remove tachometer and timing light.
_
2. Inspection of Vacuum Timing Device
(1) Set timing light.
(2) Set parking brake, start engine and run idle. '
(3) Disconnect vacuum hose from vacuum controller and
connect a vacuum pump to its nipple.
(4) Apply a vacuum to the vacuum controller gradually and
check timing advance.
It is okay if timing advances smoothly as negative
pressure increases.
Symptom
Probable cause I
I
Timing advance too large Weakened vacuum
controller spring
Timing advance too sharp
Timing advance too small
or hysteresis too large
Broken spring
Breaker base not
operating correctly
No timing advance at all
Broken diaphragm
(5) If any of the above symptoms is observed, disassemble
and check distrjbutor.
(6) Turn ignition switch to "OFF".
(7) Disconnect vacuum pump and connect vacuum hose to
the nipple of vacuum controller.
(8) Remove timing light.