Bad mass air flow sensor resistance

Mass Air Flow (MAF) Sensor. This test is almost but not exactly the same for all types of MAF Sensors. Testing to see if the MAF sensor on your L GM equipped car or pickup or SUV is BAD or not can easily be done with a multimeter.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.

Mass air flow sensor (MAF) testing without dismantling

All modern VW, Audi, and TDI use a MAF to help measure air flow. A MAF sensor is one way of directly measuring how much air is passing the MAF sensor and into the engine.

MAF/VANE AIRFLOW related trouble codes stored in the engine control computer. Inspect the wiring harness and connectors for damage. A faulty mass air flow sensor has a devastating effect on an engine. Subaru mass air flow sensors often have issues with performance. 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.

How to Know if a Mass Air Flow Sensor Is Bad

Escape MAF sensor in your Ford can go bad. This will lead to a host of Ford Escape problems.

MAF sensor may be hard to start or may stall after starting. It may hesitate under loa surge and idle rough, or run excessively rich or lean. The first step in diagnosing a faulty 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.