單項(xiàng)選擇題

A.cutting out individual injectors and noting engine performance
B.checking lube oil temperature
C.checking cam position
D.using a timing light

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A.increased carbon buildup
B.burning of intake valves
C.excessive firing pressures
D.increased fuel consumption

A.improving cylinder scavenging
B.preheating the combustion chamber
C.reducing air charge density
D.preventing valve wear