Dec 15, 2021 · The most common signs of bad mass air flow sensor (MAF) in Ford F-350 Super Duty are loss of power or slow acceleration, engine hesitation or jerking during acceleration, erratic idling, misfires, poor exhaust emission values and sometimes black smoke comes out of the tailpipe. The mass air flow sensor is part of the engine’s intake system Jan 4, 2016 · 1. Lack of power when accelerating. One of the first symptoms that a vehicle will display when the air charge temperature sensor has failed is a noticeable reduction in power when accelerating. A bad or failing sensor will not send the correct signal to the computer which will negatively affect the computer’s air / fuel mixture calculations. The 50 g/s max flow reading that you are getting is far lower than what merely altitude can explain. The chart above shows that at about 5,200 ft above sea level, the density of air is 83% of what it is at sea level (0.062 lb/cu.ft vs. .075 lb/cu.ft). So to account for the altitude, you should multiply your expected mass flow by 0.83. Sep 8, 2023 · Plug Innova 7111 scan tool into your vehicle's OBD2 port and go to View Live Data to see the MAF sensor value. With the engine at idle, the MAF sensor value should read from 2 to 7 grams/second (g/s) and rise to between 15 to 25 g/s at 2500 rpm, depending on engine displacement. Press the accelerator pedal to increase the engine speed. Feb 24, 2012 · After cleaning your mass airflow sensor with either the cleaner, or rubbing alcohol, let it sit, generally for 20 minutes or more. The sensor has to be completely dry before it can be reinstalled in your car, otherwise you may damage it. Replace it and that's all. A check engine light often comes on due to a dirty airflow sensor (MAS). Feb 26, 2022 · P0171 Causes (Lean Bank 1) Faulty or dirty mass airflow sensor. Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket. EGR or EGR valve. Weak fuel pump. Clogged or dirty fuel injectors. Clogged fuel filter. Exhaust leak. Faulty oxygen sensor. .

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