Engine Quiz Quizziz

A vehicle has black smoke coming from the exhaust after the engine is warmed up. Technician A says this may indicate worn valve springs. Technician B says this may indicate an excessively rich fuel mixture. Who is correct?

• Technician A

• Technician B

• Both A and B

• Neither A nor B

Which of these is the first step in deWhich of these is the first step in determining an engine performance problem? terminating an engine performance problem?

• Check for an exhaust leak.

• Research possible faults.

• Do a diagnostic circuit check

• Check engine mechanical operation

Which of these determines why the vehicle was brought in for service?

• Cause

• Condition

• Correction

• Concern

Engine mechanical testing should be performed in all of the following situations, EXCEPT:

• when the engine is running rough and the customer says it needs a tune-up.

• before performing major engine repair.

• when engine noises indicate a potential mechanical fault

• during a 30,000 mile service

Technician A says that a cranking sound diagnosis can be used to diagnose components in the ignition system. Technician B says that a cranking sound diagnosis can indicate differences in compression. Who is correct?

• Technician A

• Technician B

• Both A and B

• Neither A nor B

When performing the cranking sound diagnosis, the engine can be disabled by all of the following methods, EXCEPT:

• disabling the battery.

• disabling the ignition system.

• disabling the fuel pump

• using the clear flood mode

Technician A says that running an engine vacuum test provides the technician with an overview of how well the engine is operating as an air pump. Technician B says that faster airflow decreases Venturi vacuum. Who is right?

• Technician A only

• Technician B only

• Both Technician A and Technician B

• Neither Technician A nor Technician B

Which of these is a quick indicator of an engine’s ability to breathe and a reference to the engine’s ability to build compression

• Compression gauge test

• Vacuum gauge test 

• Leakage test

• Volume test

When performing vacuum testing using a vacuum gauge, a steady reading of 17” to 21” of vacuum indicates:

• a burned valve.

• a good reading

• possible late valve timing

• possible worn rings

Technician A says that low compression on a single cylinder will cause an engine not to start. Technician B says that low compression on a single cylinder means that the engine can be fixed with a tune-up. Who is correct?

• Technician A

• Technician B

• Both A and B

• Neither A nor B