Exam 7: Valve Train and Variable Valve Timing Diagnosis

How quickly can the rocker arms be switched from the low-speed camshaft profile to the high-speed camshaft profile on a Honda equipped with a VTEC system?

To increase engine performance, which camshaft is varied?

A VTEC engine changes cam lift and timing by using oil pressure and a locking pin in the ________.

The operation of the valvetrain determines ________.

On many variable displacement engines, the cylinder deactivation is done by use of a(an) ________.

How is the camshaft actuator controlled?

Active fuel management on GM vehicles was initially called ________.

A stored emission-related fault code could disable the cylinder deactivation system.

What is the first step in diagnosing variable camshaft timing systems?

On some engines, what holds the cam in position during cranking?

Technician A says that active fuel management is only used on large V8s. Technician B says that active fuel management increases fuel economy. Which technician is correct?

Which diagnostic trouble code (DTC) may be set if there is a problem with the bank 1 intake cam position?

What is different about the Atkinson cycle valve timing?

A variable displacement engine changes effective displacement by ________.

If the engine oil is not changed regularly, what is the most likely fault that can occur to an engine equipped with variable valve timing (VVT)?

What sensors are used by the PCM to determine the best position of the camshafts for maximum power and lowest possible exhaust emissions?

To reduce oxides of nitrogen (NO_x) exhaust emissions, which camshaft is varied?

What sequence of events occurs to trap some exhaust in the cylinder during a cylinder deactivation event?

Variable valve timing can be found on which type of engine?

All of the following could cause noise in the valvetrain EXCEPT ________.