Mass air flow sensor problems symptoms defective

MAF) sensor measures the volume of air entering the engine so the Engine Control Unit (ECU) can calculate how much gasoline the fuel injectors should deliver to each cylinder in order to create the proper fuel-air ratio. Sometimes, however, a malfunction in this little instrument can lead to big problems, usually resulting in very poor engine performance.

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.

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.

Mass Air Flow Sensor May Cause Driveability Issues on Nissan SentraThe mass air flow (MAF) sensor can fail, causing various drivability problems. Our technicians remind us that proper diagnoses should be performed to confirm the cause of any driveability concerns.

MAF sensor is to perform my favorite test—the tap test. Using a screwdriver, lightly tap on the sensor while the engine is running, noting any changes in engine rpm or idle quality with each tap.

MAF/VANE AIRFLOW related trouble codes stored in the engine control computer. Inspect the wiring harness and connectors for damage.

How to Detect and Clean a Faulty Mass Airflow Sensor - CarsDirect

Stalling at stop signs while the vehicle is in gear on carbureted vehicles could be caused by a failing Idle Speed Control Motor. On fuel injected vehicles, you should look for failure in the Manifold Absolute Pressure Sensor, Mass Air Flow sensor, or restricted fuel injectors.

A bad sensor can prevent some OBD II monitors from running. An oxygen sensor code, for example, will prevent the catalyst monitor from running.

A bad sensor will be flat-lined and show no response to snapping the throttle. Test for Osensors behind the catalytic converter: Graph the rear and the front Osensor output.

Other symptoms, LTFT running in the 20% range, and definite hesitation when hard accelerate from 3500-45RPM range. New MAF in and nO CEL codes.

Mass Airflow MAF Sensors - Auto Diagnosis Repair Help

My thought is that the MAF tries to compensate for some of the early throttle position sensor failure, an in turn, it’s quite common for the MAF to fail shortly after the throttle. By “shortly after,” I’m talking, perhaps, 0miles – much too long for most people to connect the failure of these two components – but, since I often drive that much in less than a month, and have had these components fail several times, the connection has been more than obvious to me.

A bad computer sensor can cause many problems. A sensor error code can be misleading.

Rough idle is another pattern failure of a MAP sensor. Other symptons could be a loss of power or sputtering engine conditions.