tachometer bouncing up and down

• 2022-01-13

The reason why the tachometer shakes up and down at idle speed is that the car's oxygen sensor fails. The solution is: if the car's oxygen sensor fails, you need to go to the car's 4S store or maintenance shop to repair or replace the car's oxygen sensor in time to solve the up and down jitter of the tachometer.

Vehicle jitter can be divided into start-up, idle speed and high-speed driving. The jitter at start-up is mainly due to insufficient fuel combustion, resulting in insufficient power of the vehicle. The ignition energy is low. When starting, especially when the temperature of fuel and lubricating oil is low, more oil is needed to meet the power. The pole gap of the spark plug gradually becomes larger, resulting in the decrease of ignition energy and poor fuel atomization. Replace the spark plug, cylinder line and remove the fault.

There are many reasons for cold start and hot start car jitter. In addition to the insufficient fuel combustion mentioned, it may also be due to abnormal engine water temperature, low cylinder pressure, blocked fuel injection nozzle, etc. if the car starts jitter, it is recommended that the owner go to the 4S store for maintenance in time.

The vehicle idle speed jitter can not be ignored. The causes of idle speed jitter include serious carbon deposition of the engine, problems in the ignition system, unstable oil pressure, aging of engine components, etc. if the idle speed jitter, the owner is recommended to clean the engine, replace the spark plug, check the fuel supply pressure, etc.

First of all, you should make sure that you haven't had maintenance for a long time. If you haven't had maintenance for a long time, you just need to go to the 4S store and repair shop for minor maintenance and replace the spark plug and fuel filter. These are common replacement items for minor maintenance. If the problem has not been solved after maintenance, you should consider whether it is a problem with the fuel system. If it is not the problem of the fuel system, it is necessary to consider whether there is a problem with the idle motor. Eliminate the above problems and check the throttle again. It may be the unstable idle speed caused by the loose throttle. Clean the throttle valve, idle the motor (very simple, self-made with strong hands-on ability), replace the cylinder line and replace the spark plug (go to Ma Yun's house to buy the original one, which doesn't have much money). The accelerator pedal is also possible. The oil may be poor, containing water or impurities.