I have got a faulty mass air sensor on my car fiesta si 1.6 ive removed the sensor and the car runs fine revs to 7k! ive been given a mass airflow from a 2.0 mondeo but the car runs very poor with this on it will not rev above 2.5k would it be worth changing injectors from a 2.0 and the inlet? or just buy a new 1.6 mass air flow sensor?

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its not worth putting the 2.0 MAF or injectors on as it'll still run poorly, the 2.0 inlet wont fit in a fiesta engine bay due too its design

your best bet is too either clean your old 1.6 MAF or find another one