Exam 27: Emission Control Devices Operation and Diagnosis

The following statements are all correct EXCEPT ________.

A state inspection of the EVAP system includes ________.

Technician A says that some crankcase vent systems use a calibrated orifice instead of a PCV valve. Technician B says that turbocharged engines often use an oil/water separator in the PCV system. Which technician is correct?

Technician A says that CO and HC levels should increase if the AIR hoses are pinched off. Technician B says that a defective drive belt may cause AIR system problems. Which technician is correct?

Technician A says that PCV valves should rattle when shaken. Technician B says that defective PCV systems may cause leaking engine seals. Which technician is correct?

Where is air from the AIR pump directed when the engine is cold?

Which component sends fresh air to the catalytic converter to help oxidize emissions?

A vacuum gauge is being used to check for a restricted exhaust system. The vacuum at idle is 18 in. Hg. Which of these results indicates a restriction?

Which exhaust emission is formed by high combustion chamber temperatures?

All of the following statements are correct EXCEPT ________.

All of these are components of smog EXCEPT ________.

Which device protects the air pump from reverse exhaust pressure?

All these are causes of catalytic converter failure EXCEPT ________.

Technician A says that a 3 x 5 card should be held against the oil fill opening if the PCV system is operating correctly. Technician B says that if a PCV valve rattles, it definitely is good. Which technician is correct?

What term is used to describe combustion gasses leaking past cylinder rings?

The OBD-II evaporative emission system monitor on a 2008 vehicle can detect a hole as small as ________.