发动机工作正常时,在其怠速运转过程中所能听到的是均匀而轻微的排气声,加速时转速过渡圆滑,高速运转时则为有力而平稳的轰鸣声。如果出现了发动机不正常工作现象,那么我们可以用“三脚油门”的方法来进行诊断。“三脚油门”并不是指运用油门的次数,而是指运用油门的三种方式:慢加速、急加速、抬油门看怠速。在诊断时应首先使发动机在稍高于怠速的 When the engine is working properly, it can hear uniform and slight exhaust noise during its idle running, and the speed of rotation is smooth when accelerating, and the powerful and steady roar during high-speed running. If the engine does not work properly, then we can use the “tripod throttle” approach to diagnosis. “Tripod throttle” does not mean the number of throttle, but refers to the use of the throttle in three ways: slow acceleration, rapid acceleration, lift the throttle to see idling. In the diagnosis should first make the engine at a little above idle speed