Download Systems Repair Worksheet

Systems Repair Worksheet
Ignition Systems
Chapter 27
Pages 810-835
Name
68 Points
Due Date
1. The _______________ system provides the properly timed, high voltage surges to ignite the A/F
mixture in the cylinders. Improper ignition affects fuel economy, performance & emissions.
2. Ignition system designs are either distributor, ____________ (coil pack) or _______ (coil-on-plug).
3. The ____________ circuit is the low voltage circuit and the ________________ is the high
voltage ignition system circuit. The primary is also the low resistance coil & secondary the high resistance coil.
4. Battery current is switched on by the _____________ ________ to supply the primary circuit.
5. When the ________________ field in the primary ignition coil ______________ through the
secondary ignition coil windings, a high voltage surge is generated (induced) & then sent to the plugs.
6. Older ignition systems used a ______________ resistor or a calibrated resistance wire to act as a
voltage drop in the primary circuit, limiting full charging voltage from reaching the primary coil.
7. The _______________ circuit carries the high voltage to the spark plugs.
8. In a distributor system, the _____ & _______ deliver the sparks top the wires in the correct order.
9. EI systems, either wasted spark or direct, have ______ firing current & _______ spark duration.
10. An ignition _______ is a pulse ________________ that has two coils of wire wrapped around
an iron core. Primary coil = 100-200 turns of AWG 20 wire. Secondary = 15,000-20,000 turns of very fine wire.
11. Iron or steel cores are used in ignition coils to reduce ____________ to magnetic lines of force.
12. _______ is the name given to the length of time the primary current flows in order to saturate
the coil primary windings with magnetic fields…often now just called “coil saturation time”.
13. ____________ is the term used to describe temporary resistance to current flow in the primary
coil caused by magnetic field interference. This is the “F” in LSMFT (5 causes of resistance in a path).
14. A coil ____________ with magnetism will have more potential to produce its designed voltage.
15. Secondary coil windings are wound on the __________ of the primary windings. collapse inward
16. The difference between the voltage required to _____ the plugs and the maximum __________
voltage, is called secondary reserve voltage. This reserve is designed to prevent misfire.
17. The spark plug _____ _____ is where high voltage causes the arc needed to ignite the A/F mix.
18. ________ on the insulator prevent electric arcing on the outside of the spark plug.
19. Spark plugs have either an ___ mm or a 14 mm diameter thread sealed with either a steel washer
or a tapered seat. Tightening specs differ depending upon the sealing method used.
20. Thread _______ (length) is crucial to properly position electrode gap in the combustion chamber.
21. As heat range goes, a cold plug has a _______ nose and a hot plug has a ______ insulator nose.
22. ____________ - type spark plugs have a 5kΩ internal resistor used to suppress RFI.
23. The ___________ used in electrode construction determine a spark plug’s longevity, power &
efficiency. Electrode materials include copper-nickel alloys, platinum, iridium, and yttrium.
24. V-groove, U-groove & pin-point _________________ designs require lower firing voltages.
25. Television & Radio Suppression (TVRS) plug wiring uses carbon impregnated __________
cores without actual wire inside. This is done to lower RFI & EMI.
26. Electronic ignition systems switch the __________ current on & off using an NPN transistor.
The emitter is connected to ground, the collector to the coil negative terminal & the base is
switched with a triggering device to interrupt (switch) the ground side of the primary coil.
27. Sensors, like the CKP & CMP, are used to trigger the NPN. These sensors can be ___________
pulse generators, _____ _______ sensors, _____________ sensors & metal detection sensors.
28. Magnetic pulse generators consist of a _____ - ____ coil & a trigger wheel called a _________.
These are also known as PM generators because they contain permanent magnets.
29. Metal detection sensors use pick-up coils with ______________ instead of permanent magnets.
30. The Hall-effect sensor is the most popular type of engine position sensor due to its __________
voltage signal throughout the entire engine rpm range and its ability to produce a square wave.
31. Photoelectric sensors use ________ - _____________ diodes and photo transistors as triggers.
32. Adjusting the _________ that spark happens is critical to efficient engine operation.
33. Ignition timing is specified by relating the position of ____ piston to degrees of crank rotation.
34. Spark timing that is called “0” occurs at exactly _____ at the end of the _____________ stroke.
35. Both ______ sensitive (vacuum) and ____ sensitive (mechanical) devices have been used to
change the timing of the spark. The PCM uses MAP (load) CKP (speed) sensors as timing inputs.
36. Distributors may contain an integral ________________ as well as an integral __________.
37. Distributorless (EI) systems are either ___________ spark or ________-over-cylinder designs.
38. EI systems eliminate parts that caused resistance and needed maintenance, reduced ______,
increased time for _______ saturation, allow individual control of cylinders, and operate cooler.
39. On _________ spark (double-ended coils), one coil is connected in series with two spark plugs.
40. __________ cylinders fire simultaneously, 1 on compression (event) & 1 on exhaust stroke (waste).
41. Coil-per-cylinder ignition (direct) can be coil- ____ -plug or coil- ________-plug.
42. On any ignition system design, timing at each cylinder can be individually changed for maximum
performance.
True
False
43. Some engines have 2 spark plugs per cylinder.
True
False
44. Some engines can fire multiple sparks from the same plug on one stroke.
True
False
45. Engine position sensors used for spark triggering can also be used to detect ____________.
46. Spark timing corrections are made to engines in an effort to compensate or correct:
coolant ________________
engine __________
stabilizing engine ________
______ operation
_________________ correction
_________ control
_______________ control correction