A check engine light may yield a code about lean or rich mixtures, but it won’t pinpoint the MAF sensor itself. So your fuel economy will fall, and your performance will suffer. First off, your air-fuel ratio will be wrong, so you’ll have a case of lean or rich mixtures. When the MAF sensor isn’t working, you’ll know it.
So it’s important to get proper readings from the MAF so that the ECU can do its job maintaining the correct ratio. This can create misfires, rough idles, and may make the engine difficult to start at all. Not only does this affect your fuel economy, but it can create untimed detonations or “knocking,” and can leave a nasty buildup of particles in the combustion chamber, mucking up your spark plugs in the process. Too much fuel gives you a “rich” mixture, and there will be some left over after the combustion. The ECU sees this reading and adjusts the fuel volume that passes through the injectors. It takes account of the air flow and converts it to an electrical signal sent to the ECU.
Check My FlowĪ MAF sensor is usually placed in-line immediately after the air filter, and takes a reading of how much air is entering the engine. This is when having a bad Mass Air Flow sensor (MAF) becomes a problem. To do this, it needs to read measurements about how much air is going into the engine at any given time. So when one increases or decreases, the computer (ECU) endeavors to maintain the perfect mixture. Air and fuel need to be metered out in an exact ratio for optimal performance. The internal workings of a car engine are complex and precise, but if all is well mechanically, a gasoline engine needs three things to run: air, fuel, and spark.
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