Diagnosing and Repairing Emission Control Systems



1.	If a square of stiff paper is not held against the inlet during a PCV system check, what may be to blame?
	A.	A plugged PCV system.
	B.	High blowby.
	C.	A manifold vacuum leak.
	D.	All of the above.

2.	What may cause increased crankcase pressure?
	A.	High blowby.
	B.	Increased crankshaft pressure.
	C.	Clogged PCV valve.
	D.	All of the above.

3.	What protective equipment should be worn when handling EGR valves?
	A.	Gloves.
	B.	Grounding strap.
	C.	Ear plugs.
	D.	Steel-toed shoes.

4.	What may happen if the catalytic converter heat shield is not reinstalled?
	A.	Catalytic converter will not reach optimum temperature.
	B.	Catalytic converter will exceed optimum temperature.
	C.	The vehicle's carpet may catch on fire.
	D.	Exhaust emissions may increase.

5.	When is engine oil most likely to become contaminated with gasoline?
	A.	During short trips in cold weather.
	B.	During long trips in cold weather.
	C.	During short trips in hot weather.
	D.	During long trips in hot weather.

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