Auto Upkeep Basic Car Care, Maintenance, and Repair (2nd Edition) Chapter 1 - Introduction and How Cars Wor Auto Upkeep Basic Car Care, Maintenance, and Repair (2nd Edition) Chapter 13 Ignition System Chapter 13 © 2007 Rolling Hills Publishing www.AutoUpkeep.com
Chapter 1 - Introduction and How Cars Wor Fuel for Thought What is required for an engine to run? How have ignition system advancements reduced required maintenance intervals? Why is it important to set the correct gap on a spark plug? Chapter 13 © 2007 Rolling Hills Publishing www.AutoUpkeep.com
© 2007 Rolling Hills Publishing www.AutoUpkeep.com Objectives Upon completion of this chapter and activities, you will be able to: Define the purpose of the ignition system. Identify ignition system generations. Define and discuss the importance of the ignition system components while relating them to their respective generation. Test and perform basic service procedures on the ignition system. Chapter 13 © 2007 Rolling Hills Publishing www.AutoUpkeep.com
Ignition System Purpose Step up voltage From 12 volts to up to 100,000 volts Ignite the air-fuel mixture Ignition takes place during the “power” stroke Chapter 13 © 2007 Rolling Hills Publishing www.AutoUpkeep.com
Ignition System Generations Conventional ignition system 1920s to 1970s Distributor ignition (DI) system Mid 1970s to early 1990s Electronic ignition (EI) system 1990s to current models Chapter 13 © 2007 Rolling Hills Publishing www.AutoUpkeep.com
Ignition System Components Chapter 13 © 2007 Rolling Hills Publishing www.AutoUpkeep.com
Ignition System Components Battery 12-volt DC Distributor cap and rotor Ignition Module Chapter 13 © 2007 Rolling Hills Publishing www.AutoUpkeep.com
Ignition System Components Ignition Coil and Coil Packs Steps up voltage Chapter 13 © 2007 Rolling Hills Publishing www.AutoUpkeep.com
Ignition System Components Spark plug wires Transfers the high voltage from the distributor cap/coil packs to the spark plugs Not used on COP systems Chapter 13 © 2007 Rolling Hills Publishing www.AutoUpkeep.com
Ignition System Components Spark plugs Center electrode commonly copper, platinum, or iridium Chapter 13 © 2007 Rolling Hills Publishing www.AutoUpkeep.com
Ignition System Components Crankshaft and camshaft sensors Keep track of piston and valve positions to efficiently time the spark Powertrain control module Precisely determines when the spark is needed to ignite the air-fuel mixture Uses sensor inputs to determine spark timing Chapter 13 © 2007 Rolling Hills Publishing www.AutoUpkeep.com
© 2007 Rolling Hills Publishing www.AutoUpkeep.com Summary The ignition system is designed to ignite the air-fuel mixture in the combustion chamber. Three generations Conventional Distributor Electronic Chapter 13 © 2007 Rolling Hills Publishing www.AutoUpkeep.com