有辆东风HY936型半挂运输车(装EQ6100-1发动机),在平坦的道路上高速行驶时尚正常,可是爬坡时却动力不足,至少相差1个档。检查发动机,起动正常,加速良好。为进一步找出故障,便拆下各缸火花塞检查气缸压力。在测量气缸压力时,发动机温度正常(水温80～85℃),节气门在全开位置,起动机带动发劫机的转速也不低于180rpm,经 A Dongfeng HY936 semitrailer (equipped with EQ6100-1 engine), driving in a flat road at high speed fashion is normal, but the lack of motivation when climbing, at least a difference of a file. Check the engine, start normal, speed up well. To further identify the fault, remove the spark plugs of each cylinder to check the cylinder pressure. In the measurement of cylinder pressure, the engine temperature is normal (water temperature 80 ~ 85 ℃), the throttle in the fully open position, the starter driven hijackers speed is not less than 180rpm, the