Question

a cylinder leakage test can help a technician pinpoint the source of a leak. if air is heard leaking out the throttle body, which part would be leaking?
select one:
a. head gasket
b. piston rings
c. intake valve
d. exhaust valve

Explanation:

In a cylinder leakage test, if air is heard leaking out the throttle body, it indicates a problem with the intake valve. The intake valve is responsible for allowing air - fuel mixture into the cylinder. If it is leaking, air can escape back through the intake manifold (where the throttle body is located).

• Head gasket leakage would typically cause coolant or oil mixing issues rather than air escaping through the throttle body.
• Piston ring leakage would cause air to escape into the crankcase (possibly noticed as excessive blow - by).
• Exhaust valve leakage would cause air to escape through the exhaust system.

Answer:

C. Intake valve