2Ignition System Purpose Create a high voltage sparkDeliver the spark at correct timeTo create a high voltage spark of 20,000 volts or more Deliver the spark to the right cylinder at the right time in the four strokes of each piston in the engine
23Heat Rages of PlugsThe difference between a "hot" and a "cold" spark plug is in the shape of the ceramic tip.The difference between a "hot" and a "cold" spark plug is in the shape of the ceramtip.The carmaker will select the right-temperature plug for each car. Some cars with high-performance engines naturally generate more heat, so they need colder plugs. If the spark plug gets too hot, it could ignite the fuel before the spark fires; so it is important to stick with the right type of plug for your car.
24Spark Plugs tell a story NormalWornLead ErossionInsulator BreakageMinor MeltingCarbonOver HeatingFuel/Additive DepositsLead FouledOil
25Old Breaker Point Ignition Used 1920’smechanical switch in distributorbuild-up - collapse coil magnetic fieldPoints wear outMust be replaced each year
39Business End of the Ignition System SizeReachHeat RangeSpark.Air Gap
40Ignition System Maintenance Replace Spark Plugs every 30,000mi/36moInspect Cap and Rotor (replace if necessary)Inspect Spark Plug wires (replace if necessary)Check Firing OrderCheck Ignition Timing (if necessary)