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A FAW Mazda car with a mileage of about 70 thousand km. User reflection: the car engine can not start. At the beginning, it is difficult to start up, and the acceleration performance is not good. It is difficult to surpass 100km/h speed. After changing the spark plug and cleaning the fuel injector, the condition of the vehicle has not been fundamentally improved, so it has to run "sick". After a few days, the engine will not start. After receiving the car: check the performance of the injector and the performance of the gasoline pump first, and everything is normal. The failure point is finally fixed on the ECU.