Bad mass air flow sensor symptoms dirty

There are a number of things on a car that are built to regulate the amount of air and fuel that get mixed. The mass airflow sensor is one of the most important of these sensors due to the job that it performs. Mass airflow sensor problems can cause a variety of symptoms from the annoying to the must repair. We'll discuss these in-depth on this page. The faulty mass airflow sensor and how to fix the problem written by: nandy A vehicles MAF or mass airflow sensor, is the element that measures the density and flow of the air passing in to the combustion section.It assists the vehicles computer activate the air ratio to fuel.A check engine light often comes on due to a dirty airflow sensor (MAS).

Learn the symptoms of an MAS that needs cleaning, and how to clean it.

How to tell you got a bad MAF

A bad mass air flow sensor in a vehicle makes starting difficult and affects the performance of the engine because he engine-control unit uses data from the MAF sensor to balance the fuel ratio the injectors deliver to the engine. A bad sensor returns a significantly different temperature than that of the engine coolant when read using a scan tool set to temperature.The cause is often a problem in the idle air control system. Other possibilities include a dirty throttle body, vacuum leak, incorrect ignition timing (retarded), bad gas (water or other contamination), an A/C compressor that is dragging, or an EVAP purge valve that is stuck open and is flooding the engine with fuel vapor. The cause is often a problem in the idle air control system.

The first thing to check is the intake vacuum with a vacuum gauge. Dirty Mass-Airflow SensorEven if you’re not having any driveability problems, it’s a good idea to clean your MAF every six months, or as part of your oil-change routine. To do so, first remove the MAF from the vehicle.