Question 1

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

Accepted Answer

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

Question 2

Which of the following statements is LEAST-Likely true?

Accepted Answer

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. 
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. D

Question 3

Which of the following statements is LEAST-Likely true?

Accepted Answer

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. 
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. B

Question 4

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

Accepted Answer

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

Question 5

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

Accepted Answer

The ignition timing is changed by loosen

Question 6

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

Accepted Answer

The answer of A ____________________ is helpful for pinpointing ignition...

Question 7

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

Accepted Answer

The answer of ____________________ on electronic ignition (EI) systems is...

Question 8

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.

Accepted Answer

A) True 
 B)False

Question 9

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?

Accepted Answer

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

Question 10

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.

Accepted Answer

A) True 
 B)False

Question 11

All of the following statements are true EXCEPT:

Accepted Answer

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. 
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 12

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

Accepted Answer

1. With the number 1 cylinder on its com

Question 13

Induced spark is called ____________________.

Accepted Answer

The answer of Induced spark is called ____________________....

Question 14

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

Accepted Answer

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

Question 15

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

Accepted Answer

Connect the spark plug tester to a spark

Question 16

What is meant by the term indexing a spark plug?

Accepted Answer

Indexing a plug is a high-performance pr

Question 17

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?

Accepted Answer

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

Question 18

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

Accepted Answer

A) True 
 B)False

Question 19

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

Accepted Answer

A) True 
 B)False

Question 20

All of the following statements are correct EXCEPT:

Accepted Answer

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. 
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.

Exam 38: Ignition System Service

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

Which of the following statements is LEAST-Likely true?

Which of the following statements is LEAST-Likely true?

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

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

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

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

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.

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?

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.

All of the following statements are true EXCEPT:

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

Induced spark is called ____________________.

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

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

What is meant by the term indexing a spark plug?

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

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

All of the following statements are correct EXCEPT:

Introduction to the Automobile

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