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I'm going to buy a mitsubishi mirage car. It's having a fault in air flow sensor. The engine is 4G15 1.5L EFI engine. The owner said that the air flow sensor is damaged,because of that,the car has a mis. When i went to see the car,the sensor and the air fllter is removed and the car is running well. And there is small damage in air filter. I've asked from a mechanic,and he said it occures because of a 'back fire' went through the air filter and that may damage the sensor also. There is a strange sound coming from the engine also. It's like a 'tappet sound' (i don't know exactly it is a tappet or a not,but it sounds like that). (One of my friend is having a lancer with a 4G15 engine. That hasn't that sound.) I want to know about the fault in this engine,the back fire thing and the strange sound. Thnks.