# While diagnosing the cause of high HC and O 2 emissions: Technician A says that the HC may be elevated because of an ignition problem. Technician B says that the O 2 may be elevated because of an ignition problem. Who is correct? a. Technician A only b. Technician B only c. Both A and B d. Neither A nor B

### Automotive Technology: A Systems A...

6th Edition
Jack Erjavec + 1 other
Publisher: Cengage Learning
ISBN: 9781133612315

### Automotive Technology: A Systems A...

6th Edition
Jack Erjavec + 1 other
Publisher: Cengage Learning
ISBN: 9781133612315

#### Solutions

Chapter
Section
Chapter 33, Problem 9ASRQ
Textbook Problem

## While diagnosing the cause of high HC and O2 emissions: Technician A says that the HC may be elevated because of an ignition problem. Technician B says that the O2 may be elevated because of an ignition problem. Who is correct?a. Technician A onlyb. Technician B onlyc. Both A and Bd. Neither A nor B

Expert Solution
To determine

The correct technician among A and B who are diagnosing the cause of high HC and O2 emissions

### Explanation of Solution

The high HC emission can be due to the reason of un-burnt fuel mixture which is the residual part of incomplete combustion. This un-burnt mixture is a result of ignition system misfiring and this misfiring in turn stops the flame front before it ignites the mixture which makes some fuel mixture to be un-burnt. This implies that technician A is correct.

The presence of high oxygen in emission implies that there is incomplete combustion...

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