We can test the sensor and replace it if necessary. Give Scotty’s Automotive in Montague, NJ, a call if you suspect you have a bad mass airflow sensor. Rough Idlingįinally, whether fuel-starved or fuel-stuffed, your engine will idle roughly if you have a malfunctioning MAF sensor. The engine will surge forward because it will pick up speed even though you keep your foot’s pressure on the accelerator the same.
When excess fuel is the problem, you will feel as if you are driving a bucking bronco. Once you reach the desired speed, it may continue to stutter and struggle to run. We are aware of the urban myth created by a few dealerships that a vehicles MAF sensor can be contaminated by K&N filter oil. In the case of a fuel-starved engine, the engine will not only hesitate when you accelerate but also as you try to pick up speed. You will also notice engine performance problems if the mass airflow sensor is malfunctioning.
#Subaru mass air flow sensor problems code
Usually, when the MAF sensor fails, it also sends an error code to the ECU and this causes it to turn on the check engine light, as well. The imbalance in the combustion chamber will cause the ECU to turn on the check engine light. The thicker the black exhaust smoke the more excess fuel your engine is burning and the more dangerous it is to continue to drive your car. This not only causes problems with your gas mileage but it also causes black exhaust to flow out of your tailpipe. When the engine has too much fuel, it burns off the excess that it doesn’t need. If a misreading from the MAF sensor tricks the ECU into putting too much fuel into the combustion chamber, your gas mileage will tank – pardon the pun. This is because it has more air than fuel and, consequently, it is fuel-starved. If a misreading from the MAF sensor tricks the ECU into putting too much air into the combustion chamber, your vehicle’s acceleration will lag. Scotty’s Automotive advises that you may never have to replace your MAF sensor, but if you notice any of the following signs of a bad mass airflow sensor, you may need to replace this auto part after all. This is because the mass airflow sensor is sending the wrong information to the engine control unit. You have to be very cautious, in any other case your mass air flow sensor will be permanently broken. Now we’ll proceed to the very delicate cleaning of the flow meter filaments. The ECU uses this information along with other sensor data to control the amount of fuel that enters the combustion chamber. Let soak the lower section of your mass air flow sensor (not the plug part) in acetone or another solvent for a few minutes, which will remove most of the grime. It passes this information onto your Legacy’s ECU.
A MAF sensor measures the density of the air entering the intake manifold. If the MAF sensor goes bad, the amount of air in the chamber will be adjusted incorrectly. A bad mass airflow sensor can leave your Subaru Legacy’s engine running rough, or even inoperable. The mass airflow (MAF) sensor and the engine control unit (ECU) work together to make sure that you always have enough air in the combustion chamber for engine combustion.
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