安徽11选五综合走势图

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Diagnosis And Treatment Of High Engine Idle Speed
Sep 20, 2019

The engine idling speed is too high. When the throttle is raised, the engine speed is still higher than the idling speed.

⑴cause

安徽11选五综合走势图① the throttle lever is not adjusted properly.

安徽11选五综合走势图② the throttle return spring is too soft.

③ the idle limit stop or adjustment screw is out of adjustment.

安徽11选五综合走势图④ the idle spring is too hard or the pre-tension is adjusted too much.

⑵diagnosis and treatment

安徽11选五综合走势图excessive idle speed is one of the easiest to check and troubleshoot. first check whether the throttle is back to the minimum position. if it is not in place, check the throttle adjustment and throttle return. adjust the throttle cable limit screw. if the throttle still cannot return, check whether the throttle return spring is too soft. if it is the fuel injection pump shortly after overhauling, you should consider whether the idle speed adjustment is correct, whether the idle spring pre-tension adjustment is too large, and if the spring has been replaced, check whether the spring is too hard.

安徽11选五综合走势图unstable idling

the manifestation of the engine idling instability is that when the vehicle is idling, it may flicker, or there may be vibrations, which cause the car to stall during a sudden deceleration or gear shift.

⑴cause

① there is air in the oil circuit.

安徽11选五综合走势图② the oil supply to the low-pressure oil circuit is not smooth.

③ improper adjustment of idle speed stabilizer.

④ poor atomization of the injector.

安徽11选五综合走势图⑤ the fuel supply of the fuel injection pump is uneven.

安徽11选五综合走势图⑥ the pins and forks of the connecting rods of the governor are too worn.

⑵diagnosis and treatment

安徽11选五综合走势图when diagnosing idling instability, it should be analyzed and judged according to the length of engine use time and the degree of maintenance of the engine.

① first, check whether the oil supply to the low-pressure oil circuit is unobstructed.

安徽11选五综合走势图_ whether the filled diesel meets the requirements and whether the maintenance of the car engine is timely, otherwise it should be cleaned or maintained and replaced.

② if the car is stopped for a long period of time or the fuel tank oil is not replenished in time, a small amount of air penetrates into the oil passage, and exhaust treatment should be performed.

③ if the car has been used for a long time, the fuel injection pump has also been debugged several times without checking the governor's wear. during the commissioning, pay attention to inspect the joints of the governor and throttle lever for excessive wear. otherwise, it should be replaced or repaired. when welding and repairing rotating parts, attention should be paid to the symmetry of quality to ensure balance.

安徽11选五综合走势图④ unsteady idling and vibration are caused by the uneven supply of fuel by the injection pump, which can be checked by the cylinder-by-cylinder oil cut method. if the broken cylinder does not cause a change in rotational speed, it means that the cylinder is insufficiently fueled or that the injector is poorly atomized. the fuel injector should be checked before the fuel injection pump.

⑤ if the idling stability device is not adjusted properly, it should be repaired on the test bench again.

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