excessive fuel penetration
prolonged injection lag
reduced ignition lag
prolonged ignition lag
第1题：
high combustion temperature
high compression pressure
cracked cylinder liner
fuel with a high vanadium content
第2题：
a shortened ignition delay period
a lean fuel/air mixture
excess fuel in the combustion chamber
rapid vaporization of injected fuel droplets
第3题：
Combustion knock occurring in a diesel engine can be caused by _____.
A.low coolant temperature
B.insufficient fuel
C.high ambient temperature
D.carbon buildup on the injector tips
第4题：
residual carbon deposits
lube oil viscosity breakdown
uneven heat expansion of the rings
uneven heat expansion of the piston
第5题：
caused by retarded injection timing
caused by a mechanical defect in one cylinder
caused by high fuel injection pressures
normal for these conditions
第6题：
a leaking fuel injector nozzle
a clogged air filter
excessively early fuel injection
malfunctioning valves
第7题：
high compression pressure
low intake air temperature
low exhaust pressure
high scavenge air temperature
第8题：
low combustion temperature
a leaking fuel nozzle check valve
late fuel injection
plugged oil-scraper ring hole
第9题：
Crankshaft revolution
Type of engine (diesel or gasoline)
Distance a piston travels during a stroke
Number of pistons
第10题：
late ignition
water in the fuel
high compression temperature
starting valve stuck open