Changan 6350 van is noisy at idle speed. The higher the gear, the less noise. It's not the throttle. It seems that the mechanic said that the loose stitches would not affect driving.

It must be repaired. Chang 'an's common fault is idle speed, sometimes high and sometimes low, but you have to determine whether that loud noise is mechanical wear or the quality of EFI components is not up to standard. Anyway, it won't cost 300 yuan. Find an old master to see if a bottle of cleaning agent can solve it, or adjust the valve clearance. Changan automobile is like this. Don't think I am ugly. The idle speed and cold start of Chang 'an bus have always been an unsolved problem.