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 Snuffout 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 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, Pickup Coil Primary, Secondary Automotive Service 5. The ignition ______is a pulsetype 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 Secondary, Primary PostSecondary, 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 coilonplug, coilnearplug, or a direct ignition system.
Two Four Six Automotive Service 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 & Pickup Coil Reactor & Pickup 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 MP3 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 14mm or 18mm 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 hotrunning spark plug has a ______insulator tip and a long path for heat to travel to cool off.
Short Medium Long Automotive Service 24. A coldrunning 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 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 tuneup 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 “coilonplug” or “coilnearplug” systems.
Cover
Ignition coil
Boot
Spark Direct plug Dialect Dominant 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? ______& ______Automotive Service Automotive Service Automotive Service Automotive Service
Distributor Ignition System Automotive Service
CoilonPlug Ignition System also known as Direct Ignition System Automotive Service
Wasted Spark Ignition System (Coil Pack) Automotive Service Automotive Service Automotive Service Automotive Service The EEC system & the ignition system come together with sensors & the PCM