Why does the water well drilling rig have no idle speed?

The engine has no idling speed, which is generally manifested as the throttle is placed in the idling position, and the engine stalls, and when the throttle is slightly increased, the speed rises very quickly, and the engine cannot run stably at low speeds.

① governor idle spring is too soft or broken.

② governor sensing element wear.

③ Serious wear of the injection pump plunger.

④ Temperature is too low.

⑤ Cylinder pressure is too low

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