The throttle nozzle of the car is loud.

Cleaning the nozzle should be carried out in a regular repair shop with a nozzle test bench, and it is not possible to clean it on site, let alone observe the quality and quantity of fuel injection with naked eyes. When the old and new nozzles are matched, there is often a big error in the fuel injection quantity, which leads to uneven cylinder work and jitter. Seriously, because the nozzle of a cylinder is not tightly closed (dripping in the cylinder), the actual fuel injection is too large, resulting in "excessive noise". I hope you'd better remove all the fuel injectors and check them on the test bench. At present, there are really too few masters who can really repair the nozzle of the EFI car.