Short Answer Flashcards

What is the most likely cause of blue smoke coming from the exhaust?

Answer: Engine burning oil

Blue exhaust smoke indicates oil is being burned in the combustion chamber, often past worn rings or valve seals.

What does the 'gross vehicle weight rating' (GVWR) represent?

Answer: Maximum total weight of the loaded vehicle as specified by the manufacturer

GVWR is the manufacturer's maximum allowable loaded weight including passengers and cargo.

When bleeding a hydraulic brake system, why is it important to start at the wheel farthest from the master cylinder?

Answer: To purge air from the longest line first and ensure complete bleeding

Bleeding the longest line first ensures air is removed progressively from the entire system.

A serpentine belt is squealing on a cold start but quiets when warm. What is a common cause?

Answer: A worn or glazed belt or failing tensioner

Squealing often comes from a glazed belt or a weak automatic tensioner failing to maintain tension.

What is the purpose of an engine's knock sensor?

Answer: Detect detonation so the PCM can retard ignition timing

The knock sensor detects detonation vibrations so the PCM can retard timing to protect the engine.

Which fluid color is typically used to identify a power steering or transmission leak that appears red?

Answer: Automatic transmission fluid / power steering fluid

Red fluid leaks usually point to ATF or power steering fluid, which are commonly dyed red.

A tire shows wear on both outer edges but not the center. What does this indicate?

Answer: Chronic underinflation

Wear on both outer edges with a good center indicates the tire has been run underinflated.