ASE Engine Diagnostics & Repair Techniques

Question 1

What does a flashing check engine light typically indicate?

Accepted Answer

Severe engine misfire

Answer

Low oil pressure

Answer

Loose gas cap

Answer

Dirty air filter

Question 2

Which tool is commonly used to read engine diagnostic trouble codes?

Accepted Answer

OBD-II scanner

Answer

Voltmeter

Answer

Multimeter

Answer

Compression tester

Question 3

What does a rich air-fuel mixture cause in an engine?

Accepted Answer

Fouled spark plugs and high emissions

Answer

Improved fuel economy

Answer

Increased horsepower

Answer

Cooler engine temperatures

Question 4

Which sensor monitors the oxygen level in the exhaust system?

Accepted Answer

Oxygen sensor

Answer

Throttle position sensor

Answer

Mass air flow sensor

Answer

Crankshaft position sensor

Question 5

What is the purpose of a compression test?

Accepted Answer

To evaluate cylinder health

Answer

To measure fuel pressure

Answer

To check battery voltage

Answer

To align the timing belt

Question 6

A misfire in one cylinder can be caused by which of the following?

Accepted Answer

Worn spark plug

Answer

Dirty cabin air filter

Answer

Low tire pressure

Answer

Faulty headlight

Question 7

What is one symptom of a failing mass air flow (MAF) sensor?

Accepted Answer

Rough idle and poor acceleration

Answer

Bright headlights

Answer

Flat tires

Answer

Slippery transmission

Question 8

What component helps reduce engine emissions?

Accepted Answer

Catalytic converter

Answer

Radiator

Answer

Timing chain

Answer

Oil pan

Question 9

What can a vacuum leak cause in an engine?

Accepted Answer

Poor performance and stalling

Answer

Smooth engine operation

Answer

Increased fuel efficiency

Answer

Reduced exhaust emissions