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Ignition Systems
Ignition System Types
 Points and Condenser
 Electronic Ignition
 DIS Distributorless Ignition System
 Coil on plug (COP)
All Systems have a primary and secondary circuits
• Primary wires go to the coil (Low-Voltage)
• Secondary wires are from the coil (High-Voltage)
Magnetic Induction
Ignition Coil
Points and Condenser
Points and Condenser
Distributor Cap and Wires
Points and Condenser System
Ignition System
Electronic Ignition
Electronic Ignition
DIS (Distributorless Ignition)
Ground signal
from PCM
12v Battery
voltage
Waste Spark
Coil On Plug
12v battery power
Ground signal
from PCM.
Spark Plugs-Single Electrode
Spark Plugs-Dual Electrode
Spark Plugs-Four Electrode
???????
Copper Spark Plug
Platinum Spark Plug
Single Platinum Double Platinum
Iridium Spark Plug
Heat Range
Heat Range
Diagnosis
Which one is inside YOUR
engine right now?
Ignition Timing
 Timing light is hooked
up to #1 spark plug
wire
 Timing is checked at
crank shaft balancer
 Adjusted by turning
distributor (not
adjustable on DIS or
COP systems)
The Reason for Ignition Timing
 As “Load” and
RPM change so
must timing
 Low LOAD needs
more timing
 High LOAD needs
less timing
 Low RPM needs
less timing
 High RPM needs
more timing
The Reason for Ignition Timing
The Reason for Ignition Timing
Timing Too Advanced
 Hard starting (bite-back), starter damage
 Engine “Ping”
 Engine runs “Hot”
 Increases HC emissions
 Increases Nox emissions
Timing Too Retarded
 Lowers HC
 Poor gas mileage
 Causes loss of power
 Can make hard to start
 Lowers engine vacuum
Inputs-Outputs (The Magic)
The End

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Ignition systems