They may go up to 2000 RPM or go down to 400-500 RPM. Rich or lean mixture will cause wrong idle rotations.The hiccups will be seen with vibration and shakes. It's easy to see if you open the hood and watch the engine when it's idling. The engine may hesitate when you push the gas pedal, and then in the process of acceleration it will nearly stall at some points. Sometimes the rotations will be so low, it may seem that the engine will stall right now. The engine shakes and nearly stalls when idling.If you look at tachometer, the arrow may jump around 1000 RPM mark. The mixture is incorrect and this causes stalling. In 5-7 seconds after starting the engine may stall.Starter may rotate the engine for a dozen of seconds until it finally starts. The engine starts after a very long rotation only.These are the symptoms of MAF sensor death Today, we'll look at main symptoms of bad MAF sensor and we'll also describe why it can die and what you can do to prolong its life. Here, Wikipedia says a lot about the principles of this sensor's work. According to that information the ECU sends the needed amount of fuel to combustion chamber to ensure that the air-fuel mixture is OK. This sensor basically sends extremely important information to the engine control unit. Mass Air Flow sensor (MAF or also MAS) measures the amount of air that comes into the engine's combustion chamber to be mixed with fuel.
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