Auto 1

1. Ignition Systems

2. Ignition Systems
 Points and Condenser
 Kettering system 1910 Cadillac
 Chrysler Electronic Ignition
 1972 340 c.i.
 HEI Distributor
 1974 GM
 DIS Distributerless ignition system
 ~1990
 Coil on plug
 Direct Ignition type
 All systems have a primary and secondary circuit
 Primary wires TO the coil - Low voltage
 Secondary are the wires AFTER the coil – Hi voltage

3. Distributor Cap and Wires

4. Distributor Type

5. Electronic Distributor

6. Distributor

7. EI or DIS
Ground signal
from PCM
12v Battery
voltage

8. Coil On Plug
12v battery power
Ground signal
from PCM.

9. Spark Plugs-Single Electrode

10. Spark Plugs-Dual Electrode

11. Spark Plugs-Four Electrode

12. Iridium-Common type today

14. Which one is inside YOUR
engine right now?

15. Inputs-Outputs

16. Ignition Timing
 Adjusted by turning
distributor
 Timing light is hooked
up to #1 spark plug
wire
 Timing is checked at
crank shaft balancer
 NOT ADJUSTABLE
on DIS or COP
systems

17. 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

18. Advanced Timing
Will cause:
 Hard starting (bite-back), starter damage
 Engine “Ping”
 Engine to run “Hot”
 Increases HC emissions
 Increases Nox emissions

19. Retarded Timing
 Lowers HC
 Poor gas mileage
 Causes loss of power
 Can make hard to start
 Lowers engine vacuum