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单选题
The rising of the exhaust temperature in manifold pipe may NOT result from （）.
A
too great a loading
B
fouled turbocharger
C
bad combustion
D
excessive air
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单选题Exhaust temperature increases in all cylinders, the possible cause may be（） (1) increased scavenging air temperature (2) air in fuel pumps and fuel valves (3) fouling of air and gas passagesA
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(1)+(2)+(3)
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early fuel injection timingD
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air charge density becoming too highB
piston crown surfaces becoming too coldC
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单选题A fuel injection valve opening at pressure lower than normal will result in（）.A
late fuel injectionB
early fuel injectionC
high exhaust temperature from that cylinderD
decreased effective stroke from that injector
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