What is the problem that the ignition timing of JAC M4 new car is unstable?

There are many reasons for engine jitter. It may be that one of the parts is broken, or it may be the comprehensive influence of many reasons. It is true that the process of repairing cars is a process of trial and error, especially the engine jitter. The following are the common causes of engine jitter for your reference:

1, air intake system failure.

A, the throttle is dirty, resulting in low idle speed. More common faults, clean the throttle in time.

B, idle motor or throttle position sensor failure. Replace throttle position sensor or idle motor. The idling of the motor is mainly caused by excessive carbon deposition, which can be cleaned, but it can only be replaced if the carbon deposition is serious.

C, air flow meter feedback information error. Feedback the sensor of engine intake and check the air flow meter.

D, waste recycling (EGR) valve failure. Adjust or replace EGR valve.