What is the reason for the engine jitter when my Haima Fujita van is idling?

Cause detection of engine jitter at idle speed;

1. Check that the engine tachometer pointer swings up and down at idle speed. If it swings, it means that there is something wrong with the air intake system, such as idle motor and throttle valve.

2. Plug in a computer detector (such as modern special detector or X43 1, etc.). ) to detect whether the engine has a fault code.

3. Use computer detector to detect intake pressure sensor, throttle position, oxygen sensor voltage and ignition advance angle.

4. If there is no problem above, check or cremate the plug and cylinder pipeline, and replace it if it is damaged.

If there is no problem above, only check the cylinder pressure. If the cylinder pressure is insufficient, it will be more troublesome and can only be sent to a repair shop for repair.