Car Tuning Car Maintenance 3

Question 1

What does it mean when your car's battery tests at 12.0V with the engine off?

Accepted Answer

The battery is at approximately 50% charge and may need replacement soon

Answer

A fully charged 12V lead-acid battery reads about 12.6V; 12.0V indicates roughly 50% state of charge.

Question 2

Which maintenance task is most critical before installing a performance supercharger?

Accepted Answer

Ensuring the engine's compression rings and seals are in good condition

Answer

A supercharger dramatically increases cylinder pressure, so worn rings or leaking seals will fail quickly under boost.

Question 3

What is the function of a coolant overflow reservoir (expansion tank)?

Accepted Answer

It catches coolant that expands when hot and returns it to the radiator when cool

Answer

As coolant heats and expands, excess flows into the reservoir; as the engine cools, the pressure drop draws it back into the radiator.

Question 4

Why should you never open a radiator cap immediately after the engine has been running?

Accepted Answer

The system is pressurized and scalding coolant can spray out

Answer

Cooling systems operate above atmospheric pressure; removing the cap while hot releases that pressure explosively, ejecting boiling coolant.

Question 5

What causes a serpentine belt to squeal, especially on startup?

Accepted Answer

Belt glazing, slipping, or a seized accessory pulley

Answer

A glazed or slipping serpentine belt loses grip on pulleys, creating a high-pitched squeal that is often loudest during cold starts.

Car Tuning Practice Test