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11-45

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 

Engine performance problems are problems that affect the engine's ____.
a.
power
c.
emission levels
b.
fuel economy
d.
All of the above.
 

 2. 

When diagnosing a "no-start" problem, the first thing you should check for is ____.
a.
spark
c.
fuel
b.
compression
d.
battery ground
 

True/False
Indicate whether the statement is true or false.
 

 3. 

A systematic approach to locating performance problems is the most effective.
 

 4. 

Surging is a condition in which the engine nearly stalls before accelerating.
 

 5. 

Rough idling is commonly caused by a vacuum leak.
 

 6. 

If fuel octane is too high, pinging will result.
 

 7. 

When the air-fuel mixture ignites in the exhaust system, the problem is referred to as preignition.
 

 8. 

Incorrect ignition timing can negatively affect fuel economy.
 

 9. 

Run-on only occurs in diesel engines.
 

 10. 

Engine misfiring at idle can be caused by an injector that is not opening.
 

Completion
Complete each statement.
 

 11. 

Vapor ______________________________ occurs when fuel is overheated and forms bubbles.
 

 

 12. 

Vacuum leaks can be detected by listening for a(n) ______________________________ sound.
 

 

 13. 

A mild backfire in the throttle body or carburetor is often referred to as a(n) ______________________________.
 

 

 14. 

Fuel economy can be measured by determining the number of miles that can be driven on one ______________________________ of fuel.
 

 

 15. 

______________________________ is caused by spontaneous combustion of the air-fuel mixture in a cylinder without a spark plug firing.
 

 

 16. 

A temporary leaning of the air-fuel mixture can cause the engine to ______________________________ or stumble.
 

 

 17. 

When moisture in fuel turns to ice, blockage usually occurs at the fuel ______________________________.
 

 

 18. 

A(n) ______________________________ engine will cause a vehicle to accelerate slowly.
 

 



 
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