Question 1

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

Accepted Answer

Ignition timing

Question 2

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

Accepted Answer

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

Question 3

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 4

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

Accepted Answer

1. With the number 1 cylinder on its com

Question 5

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 6

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 7

What is meant by the term indexing a spark plug ?

Accepted Answer

Indexing a plug is a high-performance pr

Question 8

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

Accepted Answer

The answer of A(n) ____________________ is one with a buildup...

Question 9

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 10

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

Accepted Answer

A) True 
 B)False

Question 11

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

Accepted Answer

A) True 
 B)False

Question 12

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 13

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 14

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 15

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.

Question 16

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

Accepted Answer

To test spark plug cable insulation for

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

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

Question 19

When a distributor cap is cracked, a(n) ____________________ often forms along the crack.

Accepted Answer

The answer of When a distributor cap is cracked, a(n)...

Question 20

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

Exam 38: Ignition System Service

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

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

Which of the following statements is LEAST-Likely true?

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

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?

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

What is meant by the term indexing a spark plug ?

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

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

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

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

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

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

All of the following statements are true EXCEPT:

Which of the following statements is LEAST-Likely true?

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

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

When a distributor cap is cracked, a(n) ____________________ often forms along the crack.

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

Introduction to the Automobile

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Measuring Tools and Systems

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