Automotive Service Modern Auto Tech Study Guide Chapter

Automotive Service Modern Auto Tech Study Guide Chapter 34 Pages 567 - 594 Ignition Systems 42 Points

Automotive Service 1. The ignition system produces the high voltage needed to _______ the air/fuel mixture in the cylinders. Destroy Ignite Snuff-out

Automotive Service 2. The ignition system makes electric arcs across the gaps at the ______ and times them to happen exactly as each piston nears TDC of its compression stroke. Spark Plugs Crankshafts Oxygen Sensors

Automotive Service 3. The 12 volt _______ is the primary source of electricity for the system but the ignition ____ transforms this voltage into 30, 000 or more secondary circuit volts during normal engine operation. Coil, Battery, Coil Starter, Alternator

Automotive Service 4. The two main circuits in an ignition system are the _____ (low volts) and the _______ (high volts) circuits. The secondary circuit has thicker insulation to prevent electrical leakage & shorting. Module, Spark Plug Reluctor, Pick-up Coil Primary, Secondary

Automotive Service 5. The ignition ____ is a pulse-type transformer used to produce short bursts of high voltage for sparks. Module Coil System

Automotive Service 6. Ignition coils have ____ windings wrapped around _____ windings & a soft iron core or armature in the center of the two windings or coils. Primary, Secondary, Primary Post-Secondary, Primary

Automotive Service 7. Primary magnetic ______ collapsing through secondary coils of wire induce a surge used for spark. Fields Coils Shunts

Automotive Service 8. Distributorless ignition systems may have one coil pack for every ______ cylinders. A system with one ignition coil for every cylinder is known as a coil-on-plug, coil-near-plug, or a direct ignition system. Two Four Six

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Automotive Service 9. On distributorless ignition systems, a coil ____, consisting of several ignition coils combined into one assembly, connects on to the spark plug wires for two cylinders. No secondary coil wire is used in this system. Track Rack Pack

Automotive Service 10. A ______ - _____ ignition coil is wired to fire two spark plugs at the same time, one forward polarity (+ to -) & the other reverse polarity (- to +). This is known as the “wasted spark” method. Pick - Up Wasted - Spark Shut - Off

Automotive Service 11. The __________ is used to signal the on/off cycling of primary ignition current, distribute the high voltage secondary current, adjust the timing of the spark, and sometimes even drive the oil pump. Distributor Alternator Starter

Automotive Service 12. The main switching components inside of an electronic distributor are the _______ (trigger wheel) & the ________ coil (a. k. a. sensor assembly or sensor coil). The reluctor & pickup coil are known as a permanent magnet generator. Hall effect & optical pickups are also used to “trigger” the primary circuit. Reluctor & Pick-up Coil Reactor & Pick-up Coil Reluctor & Timer Core

Automotive Service 13. The primary circuit magnetic fields are building up when the ignition control ______ is on. This closes the primary circuit. When the primary circuit is opened, the primary fields collapse through the secondary coil winding and fire the spark. Primary circuit closed time is known as “dwell time”. Module Switch Plug

Automotive Service 14. The ___________ cap and the _____ are responsible for transferring the high voltage surge from the ignition coil to the spark plug wires in the correct firing order. Distributor & Rotor Distributor & Reluctor Distributor & Coil Pack

Automotive Service 15. _____ wires are also known as secondary wires since they are the main conductors in the secondary circuit. The abbreviation TVRS on wires stands for television & radio static suppression. Carbon Fiber Spark Plug Primary

Automotive Service 16. Spark plug wires have between 2, 000 - 12, 000 ohms per foot of resistance to prevent ______ static. RFI, also known as radio frequency interference Radio MP 3 Brain Wave

Automotive Service 17. The main parts of a spark plug are the center terminal or _________, the side or ______electrode, the ceramic ________, & the steel shell which ______ into the cylinder head. Electrode, Ground, Insulator, Threads or Screws Seal, Gap, Ribs, Shell Meat, Potatoes, Coffee, Dessert

Automotive Service 18. Spark plug thread _____ is the length of the threaded portion of the steel shell. Reach Leach Beach

Automotive Service 19. Spark plug _______ are either 14 mm or 18 mm in diameter and are sealed with either a washer or a tapered seat that fits into the tapered hole in the cylinder head. Gaps Threads Insulators

Automotive Service 20. A _________ spark plug has an internal resistance of around 5, 000 ohms to 10, 000 ohms to reduce RFI. Thermistor Sure Mister Resistor

Automotive Service 21. Spark plug _____ (distance between the center & side electrodes) is adjusted by bending the side electrode. Gaps Threads Insulators

Automotive Service 22. Spark plug __________ is a rating of the ability of the plug to conduct heat away & cool off. Heat Range Thread Reach Part Number

Automotive Service 23. A hot-running spark plug has a _______ insulator tip and a long path for heat to travel to cool off. Short Medium Long

Automotive Service 24. A cold-running spark plug has a _______ insulator tip and a short, quick path for heat to travel. Short Medium Long

Automotive Service 25. Some engines use two spark plugs per cylinder and some discharge multiple _____ to ignite a/f mix. Sparks Fuels Airs

Automotive Service 26. Distributor ____________ advance mechanisms used for power, and __________ advance mechanisms used to increase fuel economy, have been replaced by more the reliable, electronic spark control systems. The electronic engine control system now handles spark advance duties. Centrifugal, Vacuum, Centrifugal Electronic, Electronic

Automotive Service 27. Engine ____ monitor various operating conditions & send electrical data to the computer (PCM) where it is analyzed and used to change ignition timing for maximum engine efficiency, performance, mpg, & low emissions. ** These 3 benefits are often referred to as “driveability”. Sparks Sensors Actuators

Automotive Service 28. Checking the _____ ignition timing is an important tune-up procedure on distributor ignition engines Base Case Lase

Automotive Service 29. Distributorless ignition systems require less __________ and their spark timing is not adjustable. Maintenance Polishing Gasoline

Automotive Service 30. A ________ ignition system has an ignition coil mounted over the top of each spark plug. These ignition systems are most often called “coil-on-plug” or “coil-near-plug” systems. Cover Ignition coil Boot Direct Dialect Dominant Spark plug

Automotive Service 31. Engine ______ is the sequence in which the spark plugs fire to ignite the a/f mix. Fling Order Firing Order Arrangement

Automotive Service 32. What are the typical, firing orders that four cylinder engines usually have? ______ & ______

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Automotive Service Distributor Ignition System

Automotive Service Coil-on-Plug Ignition System also known as Direct Ignition System

Automotive Service Wasted Spark Ignition System (Coil Pack)

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Automotive Service The EEC system & the ignition system come together with sensors & the PCM