Solutions for Engine Vibration After Fuel Injector Cleaning

[VonAngelina]

The reason for engine vibration after fuel injector cleaning is: It's quite normal to experience vibration after cleaning fuel injectors. The vehicle's ECU has a self-learning function that stores pre-cleaning fuel injection data. When injector nozzles are clogged with carbon deposits, the throttle valve automatically increases its opening to maintain idle air intake. After cleaning, the throttle valve still uses the clogged data, causing unstable idle and severe vibration due to excessive throttle opening. Simply resetting the throttle valve to factory settings can resolve this issue. The working principle of fuel injectors is: High-pressure fuel is pumped into the injector's supply port, creating pressure inside that acts on the injector's conical surface. When oil pressure exceeds the set value, the injector valve opens, spraying atomized fuel through small nozzles into the engine cylinder for combustion, driving piston reciprocation.