Question 1

The ignition system on many newer cars has no:

Accepted Answer

A)  distributor 
B)  coil 
C)  spark plugs 
D)  crank position sensor 
A)  distributor 
B)  coil 
C)  spark plugs 
D)  crank position sensor A

Question 2

What is the spark plug heat range, and why is it important?

Accepted Answer

The heat range of a spark plug is its ability to dissipate heat from the combustion chamber to the cylinder head. It is important to maintain the spark plug temperature between 842°F and 1652°F (450°C and 900°C). If the spark plug burns hotter than the desired range, the electrode could burn, and pre-ignition, detonation, and possible engine damage could result. If the spark plug burns colder than the desired range, the electrode will not be able to self-clean, which will lead to misfiring and poor performance.

Question 3

The vehicle manufacturer specification for spark plug heat range can be changed.

Accepted Answer

A) True 
 B)False  False

Question 4

The independent ignition system offers greater reliability and a lower incidence of cylinder misfires compared to past ignition systems.

Accepted Answer

A) True 
 B)False

Question 5

What are the coil oscillations that occur after the spark burn time line on an oscilloscope?

Accepted Answer

It is the excess vol

Question 6

The spark burn time line is the length of time that the spark plug is igniting (firing) the air/fuel mixture in the cylinder.

Accepted Answer

A) True 
 B)False

Question 7

What are the two design methods used on the coil-on-plug independent ignition system?

Accepted Answer

The coil-on-plug independent i

Question 8

If all cylinders are igniting the air/fuel mixture uniformly, what should the difference in firing line height (voltage) of each cylinder be?

Accepted Answer

If all engine cylind

Question 9

A secondary ignition oscilloscope pattern is being analyzed. The voltage spikes of cylinders #1, #2, and #3 are 9 to 12 kV while cylinder #4 is 35 kV. What is the most likely cause of this?

Accepted Answer

A)  open plug wires for cylinders #1, #2, and #3 
B)  shorted spark plug 
C)  grounded plug wires 
D)  open plug wire for cylinder #4 
A)  open plug wires for cylinders #1, #2, and #3 
B)  shorted spark plug 
C)  grounded plug wires 
D)  open plug wire for cylinder #4

Question 10

A random misfire code P0300 is usually associated with an ignition system failure.

Accepted Answer

A) True 
 B)False

Question 11

What is the typical spark plug burn time?

Accepted Answer

The typical burn tim

Question 12

Describe the iridium spark plug and its benefits.

Accepted Answer

The iridium spark plug is the longest-li

Question 13

What is the period of time called when current flows through the primary windings of a coil to increase the magnetic field generated?

Accepted Answer

Coil satur

Question 14

The coil-on-plug design allows for increased coil saturation time between cylinder firing.

Accepted Answer

A) True 
 B)False

Question 15

An engine knock may occur due to:

Accepted Answer

A)  low fuel octane 
B)  excessive carbon buildup in the combustion chamber 
C)  ignition spark occurring too early 
D)  all of the above 
A)  low fuel octane 
B)  excessive carbon buildup in the combustion chamber 
C)  ignition spark occurring too early 
D)  all of the above

Question 16

A technician repaired a cold-start and hard-starting problem by replacing the secondary ignition wires and spark plugs. After the repair, the vehicle failed an emission test for high CO and HC levels. Technician A says a restriction in the fuel delivery system such as the fuel filter could be the problem. Technician B says that the engine oil could be contaminated with fuel. 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 17

A higher than normal firing line voltage could be caused by a low secondary ignition resistance.

Accepted Answer

A) True 
 B)False

Question 18

What are the differences between the coil-on-plug ignition system and previous EI systems?

Accepted Answer

The independent ignition system is also

Question 19

Changes in engine load also affect when the ignition spark should be delivered.

Accepted Answer

A) True 
 B)False

Question 20

During the power stroke, when must the air/fuel charge be fully ignited in order for maximum combustion pressure and power production to occur?

Accepted Answer

10 degrees

The ignition system on many newer cars has no:

What is the spark plug heat range, and why is it important?

The vehicle manufacturer specification for spark plug heat range can be changed.

The independent ignition system offers greater reliability and a lower incidence of cylinder misfires compared to past ignition systems.

What are the coil oscillations that occur after the spark burn time line on an oscilloscope?

The spark burn time line is the length of time that the spark plug is igniting (firing) the air/fuel mixture in the cylinder.

What are the two design methods used on the coil-on-plug independent ignition system?

If all cylinders are igniting the air/fuel mixture uniformly, what should the difference in firing line height (voltage) of each cylinder be?

A secondary ignition oscilloscope pattern is being analyzed. The voltage spikes of cylinders #1, #2, and #3 are 9 to 12 kV while cylinder #4 is 35 kV. What is the most likely cause of this?

A random misfire code P0300 is usually associated with an ignition system failure.

What is the typical spark plug burn time?

Describe the iridium spark plug and its benefits.

What is the period of time called when current flows through the primary windings of a coil to increase the magnetic field generated?

The coil-on-plug design allows for increased coil saturation time between cylinder firing.

An engine knock may occur due to:

A higher than normal firing line voltage could be caused by a low secondary ignition resistance.

What are the differences between the coil-on-plug ignition system and previous EI systems?

Changes in engine load also affect when the ignition spark should be delivered.

During the power stroke, when must the air/fuel charge be fully ignited in order for maximum combustion pressure and power production to occur?

Emissions and Engine Performance Overview

Basic Theories

History of On-Board Diagnostics Obd

On-Board Diagnostic Scanners and Digital Storage Oscilloscopes

Computers and Input Sensors

Fuel System and Related Input Sensorsoutput Actuators Diagnosis

Emission Control and Evaporative Systems

Strategies of On-Board Diagnostic Continuous Monitors

Strategies of On-Board Diagnostic Non-Continuous Monitors

Im Failure Diagnosis and Five-Gas Exhaust Analysis

Filters

Exam 6: Ignition System and Related Input Sensorsoutput Actuators Diagnosis

The ignition system on many newer cars has no:

What is the spark plug heat range, and why is it important?

The vehicle manufacturer specification for spark plug heat range can be changed.

The independent ignition system offers greater reliability and a lower incidence of cylinder misfires compared to past ignition systems.

What are the coil oscillations that occur after the spark burn time line on an oscilloscope?

The spark burn time line is the length of time that the spark plug is igniting (firing) the air/fuel mixture in the cylinder.

What are the two design methods used on the coil-on-plug independent ignition system?

If all cylinders are igniting the air/fuel mixture uniformly, what should the difference in firing line height (voltage) of each cylinder be?

A secondary ignition oscilloscope pattern is being analyzed. The voltage spikes of cylinders #1, #2, and #3 are 9 to 12 kV while cylinder #4 is 35 kV. What is the most likely cause of this?

A random misfire code P0300 is usually associated with an ignition system failure.

What is the typical spark plug burn time?

Describe the iridium spark plug and its benefits.

What is the period of time called when current flows through the primary windings of a coil to increase the magnetic field generated?

The coil-on-plug design allows for increased coil saturation time between cylinder firing.

An engine knock may occur due to:

A higher than normal firing line voltage could be caused by a low secondary ignition resistance.

What are the differences between the coil-on-plug ignition system and previous EI systems?

Changes in engine load also affect when the ignition spark should be delivered.

During the power stroke, when must the air/fuel charge be fully ignited in order for maximum combustion pressure and power production to occur?

Emissions and Engine Performance Overview

Basic Theories

History of On-Board Diagnostics Obd

On-Board Diagnostic Scanners and Digital Storage Oscilloscopes

Computers and Input Sensors

Fuel System and Related Input Sensorsoutput Actuators Diagnosis

Emission Control and Evaporative Systems

Strategies of On-Board Diagnostic Continuous Monitors

Strategies of On-Board Diagnostic Non-Continuous Monitors

Im Failure Diagnosis and Five-Gas Exhaust Analysis

Filters