The document discusses the components and operation of an ignition system, including the secondary coil, spark plug, core, igniter, and primary coil. It provides typical waveforms for ignition and troubleshoots potential issues with the ignition system components and signals. Common problems addressed include late or early primary turn-on, loose or dirty connections, defective coils or condensers, and indications of high resistance or fouling in the secondary or spark plug circuits.

1. Ignition System Description
(1/1)
Secondary coil
Spark plug
Core
Igniter
Primary coil
ON

2. WAVEFORMS IGNITION

3. TYPICAL WAVEFORMS

4. TROUBLESHOOTING THE IGNITION SYSTEM

5. DWELL SECTION
Primary turn-on too late
Primary turn-on
Primary turn-on too early

6. Poor coil-to-ground conection
Defective coil or pited breaker
points
Trigger signal Loose
conection
Dirty or burned points

7. Resistive points
Burnt, dirty, misaligned,
defective condenser
Does not indicates a
malfunction
Condenser resistance or bad
conection between the
condenser and the distributor

8. Indicates open
circuit secondary
Indicates very high
secondary
resistance

9. Indicates high
secondary resistance
Indicates high spark
plug circuit resistance
Indicates high
secondary resistance
Indicates excessive
secondary resistance

10. Indicates intermittent
proplem
Indicates spark plug
internal resistance
Indicates internal
resistance
Indicates rich fuel
mixture

11. Indicates spark plug
blowing out and then
restarting
Indicates cap to rotor
segment is bad
Indicates reversed coil
polarity
Indicates spark plug
fouled, shorted or gap
too close