- Push on the tabs and unplug the MAF sensor electrical connector
2- Remove the two tamper proof torx screws that attach the MAF sensor to the air intake tube and remove the sensor from the vehicle.
- As you can see in this image, the MAF sensor is contaminated with engine oil, it was cause by the back-pressure in the engine due to high mileage, when a vehicle has higher back-pressure than normal, the PCV valve is not able to recycle the crankcase pressure back in to the engine, causing the excess crankcase pressure to exit through the breather tube that leads to the air intake tube, because its proximity to the MAF sensor, the oil expelled by the engine coated the film inside the sensor causing it to have a very sluggish performance.
- We removed all the oil from the MAF sensor by spraying it with carb cleaner, (you can also buy MAF sensor cleaner at your local auto parts store )once it was clean, we allowed it to dry as we cleaned the electrical connector, once the sensor was dry, we installed it back on the car and took it for a test drive, the problem was gone, no more hesitation under acceleration and no more lack of power, it felt like we could pass everybody if we wanted to.
As you just witnessed, MAF sensors can malfunction when they get contaminated, but you can't go to the store and buy a new sensor every time, we just showed you how to clean it, and if the problem was just contamination, once is clean it will work as good as new.
In the next page we will show you the steps needed to replace an air-flow meter ( MAF sensor basically) in a Nissan pick-up.