Deck 38: Ignition System Service

Question 1

The ignition pattern MOST-Likely used to display all of the cylinders, one above the next, is the:

A)raster pattern
B)superimposed pattern
C)display pattern
D)stress pattern

Answer 1

A

Question 2

Tune-up is a term that originated during the days when cars had ignition points and required periodic service.

Answer 2

True

Question 3

Higher spikes indicate more resistance to spark. This can be due to a spark plug gap that is too narrow, a rich air-fuel mixture, or compression that is too low.

Answer 3

False

Question 4

A(n) ____________________ is one with a buildup of carbon that shorts it out.

Question 5

____________________ on electronic ignition (EI) systems is controlled by the powertrain control module (PCM).

Question 6

A ____ compares all of the cylinders while their patterns are displayed one on top of the other.

A)raster pattern
B)superimposed pattern
C)display pattern
D)stress pattern

Question 7

A ____________________ is helpful for pinpointing ignition and engine problems by analyzing a pattern displayed on a screen.

Question 8

The term MOST-Likely used to describe a high-speed voltmeter with a built-in time frame is:

A)dwell
B)hard fault
C)spike
D)scope

Question 9

All of the following statements are true EXCEPT:

A)A spark plug that is not torqued to the correct specification can misfire.
B)A spark plug can overheat if not tightened correctly or if a tapered plug seat is dirty.
C)double plat spark plug life is estimated to be 100,000 miles.
D)on modern engines, spark plug cleaning is extremely cost effective.

Question 10

The life of a spark plug is determined by the temperature of combustion, the quality of the electrical system, the correct air-fuel ratio, and good oil control in the cylinder.

Question 11

It is safe to disconnect an ignition module with the ignition switch on.

Question 12

There are several different types of spark plug thread inserts. While having a discussion, Technician A says that when a spark plug uses a sealing washer, the insert is plated with a copper flash. Technician B says that when a spark plug in a cast iron head has a tapered seat, silver-plated inserts are used. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 13

A coil cannot be tested while it is removed from the circuit.

Question 14

Induced spark is called ____________________.

Question 15

The term ____________________ refers to either contact points or the electronic device that signals the module to make and break the primary circuit in the coil.

Question 16

Which of the following statements is LEAST-Likely true?

A)A leaner air-fuel mixture causes a higher resistance to spark, requiring more voltage to jump the plug gap.
B)A poorly performing cylinder with a high firing line can indicate a lean air-fuel mixture.
C)A poorly performing cylinder with a low firing line can indicate low compression.
D)You should run the engine at 800-1,000 rpm for oscilloscope tests.

Question 17

The ____ is a horizontal line that begins at the voltage level where electrons start to flow across the spark plug gap.

A)carbon trail
B)spark line
C)firing line
D)hard fault

Question 18

Which of the following statements is LEAST-Likely true?

A)When tightening a spark plug, the seal of the plug can be ruined by overtightening.
B)Spark plugs that are tight will run hot and can cause serious engine damage.
C)An overly tightened spark plug in an aluminum head can result in stripped threads when attempting to remove the plug at its next replacement interval.
D)Using antiseize on spark plug threads reduces the torque requirement.

Question 19

While having a discussion about spark plugs, Technician A says that blistering of the insulator tip is indicative of a plug that has been too hot. Technician B says that the accumulation of specks that resemble pepper is indicative of a plug that has been too hot. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 20

All of the following statements are correct EXCEPT:

A)to determine that the internal structure of a cable is sound, check its resistance with a voltmeter.
B)when installing the cables on the engine, do not allow cables from cylinders that fire after one another in the firing order to run parallel to each other.
C)cables should be held in looms away from the exhaust manifold and engine drive belts.
D)do not allow any cables to run over the computer wiring loom where they could set up radio interference for the computer signals.

Question 21

What are the steps involved in static timing the ignition system?

Question 22

How would you use a spark plug tester to perform an available voltage test?

Question 23

How would you test a spark plug cable insulation for leaks?

Question 24

Before computer controls became commonplace on engines, how would you change a vehicle's ignition timing?

Question 25

What is meant by the term indexing a spark plug?