driveability and emissions chapter 27

when checking for the proper operation of the AIR system using an exhaust gas analyzer how much should the oxygen levels increase when the pump is allowed to function? A) 1 to 4% B) 5 to 10% C) 10 to 20% D) up to 30%

1 to 4%

The PCV system controls which exhaust emissions? A) HC B) CO C) NOx D) both HC and CO

both HC and CO

the SAI system is used to reduce which exhaust emissions? A) HC B) CO C) NOx D) both HC and CO

both HC and CO

where is the output of the AIR pump directed when the engine is cold? A) exhaust manifold B) catalytic converter C) air cleaner assembly D) to the atmosphere

exhaust manifold

The switching valves on the AIR pump have failed several times. Technician A says that a defective exhaust check valve could be the cause. Technician B says that a leaking exhaust system at the muffler could be the cause. Which technician is correct? A) technician A B) technician B C) both Technicians A and B D) neither technicians A nor B

technician A

Technician A says that if a PCV valve rattles, then it is okay and does not need to be replaced. Technician B says that if a PCV valve does not rattle, it should be replaced. Which technician is correct? A) technician A B) technician B C) both technicians A and B D) neither technicians A nor B

technician B

Technician A says that the PCV system should create a slight pressure in the crankcase at idle. Technician B says that the PCV system should create a slight vacuum in the crankcase at 2,500 rpm. Which technician is correct? A) technician A B) technician B C) both technicians A and B D) neither technicians A nor B

technician B

Two technicians are discussing exhaust check valves used in SAI systems. Technician A says that they are used to prevent the output from the SAI pump from entering the intake manifold. Technician B says the check valves are used to keep the exhaust from entering the AIR pump. Which technician is correct? A) technician A B) technician B C) both technicians A and B D) neither technician A nor B

technician B

how much of the air needed by the engine flow through the PCV system when the engine is at idle speed? A) 1 to 3% B) 5 to 10% C) 10 to 20% D) up to 30%

up to 30%