Symptoms of a bad gm mass air flow sensor

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.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. MAF sensor may be hard to start or stall after starting. It may hesitate under loa surge, idle rough or run excessively rich or lean.

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.

How to tell you got a bad MAF

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.

Cleaning the mass air flow sensor on your L, L (and some select L with a MAF sensor) is not hard at all.Dirt not only fouls the MAF sensor, it also clogs the idle air control (IAC) and will rapidly wear upper engine cylinder parts. As for paper, keep in mind poor-quality air filters often shed paper fibers that accumulate on the heated wire and resistor assembly. MAF is a hesitation after the accelerator pedal is depressed. Some other common symptoms include the following:Difficulty startingStalling shortly after startingHesitation under loadJerking during accelerationErratic idle or operation Fuel-trim-related code(s)Excessively rich or lean idling, often causing black smoke from the tailpipeCommon Causes of MAF FailuresThe majority of MAF failures are due to dirt, paper, or oil contamination.

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

Problems with Mass Air Flow sensors are common. Bad or contaminated Mass Air Flow sensor can possibly cause a wide range of various vehicle driveability problems such as stalling, especially when the engine is col misfiring, poor acceleration, etc.

Long story short if it runs there will be air flow to intake and there should be a MAF signal. Even if the engine is off there will be a zero flow signal back to the PCM.