What are the causes of a rich fuel mixture fault?

1 Answers
LaEloise
07/30/25 9:11am
It may be caused by excessive carbon buildup on the throttle valve, which requires cleaning at a 4S shop to resolve the issue. Alternatively, it could be due to faults in the oxygen sensor, coolant temperature sensor, or intake pressure sensor. Here is an introduction to the automotive fuel system: Components: The automotive fuel system includes components such as the fuel tank, fuel pump, fuel damper, fuel pressure regulator, fuel filter, fuel injector, thermostat timing switch, and cold start valve (cold start injector). Carbon Buildup: Carbon deposits and sediments can clog the needle valve and valve holes of the fuel injector, affecting the performance of the precision components in the injection system, leading to poor fuel injection, inadequate atomization, and reduced power performance.
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