If they do not look the same as your old part, it is probably not the item you need. Mass Air Flow Sensor Information Description Air changes its density as it expands and contracts with temperature and pressure. In automotive applications, air density varies with the ambient temperature, altitude and the use of forced induction, which means that mass air flow (MAF) sensors are more appropriate than volumetric flow sensors for determining the quantity of intake air in each piston stroke. There are two common types of mass airflow (MAF) sensors in use on automotive engines.These are the vane meter and the hot wire. Neither design employs technology that measures air mass directly. However, with additional sensors and inputs, an engine's electronic control unit can determine the mass flow-rate of intake air. Both approaches are used almost exclusively on electronic fuel injection (EFI) engines. Both sensor designs output a 0.05.0 volt or a pulse-width modulation (PWM) signal that is proportional to the air mass flow rate, and both sensors have an intake air temperature (IAT) sensor incorporated into their housings. Components A vane meter sensor has a spring-loaded paddle which extends into the air stream of the intake. The vane is pushed back in proportion with the strength of the airflow, creating a potential charge in proportion to the degree with which the vane is being pushed. This charge is sent to the engine control unit and registered, the strength of the charge telling the ECU the volume of airflow. The primary drawback to this type of sensor is that the paddle itself can restrict airflow, decreasing engine output. A hot wire sensor works by passing an electrical current through a wire suspended in the engine's air stream, heating it.
As the temperature increases, the wire's electrical resistance increases, limiting the amount of electrical current which can flow through the circuit attached to the wire. As air intake increases, the passing air cools the wire, decreasing its resistance and increasing the amount of electricity passing through the circuit. The wire's temperature is set to maintain equilibrium with the passing air, so the current increases only when the air intake increases.
Likewise, the current decreases when the air intake decreases from the norm. These changes in current flow are registered by the engine control unit and translated into the relevant information for the ECU to make the necessary changes to account for the new intake level. These types of sensors are very accurate, however they are fragile.Any dirt or oil can contaminate the wire and cause an inaccurate reading. Function A mass airflow sensor (MAF) is a device used in fuel injected engines to measure the mass, amount or weight of air passing through it. They are placed on the intakes which deliver air into the engine's combustion chambers. This device is used by the electronic engine control unit to determine how much fuel should be delivered to the combustion chambers via the fuel injectors in order to maintain the best air/fuel ratio for combustion. There are two types of mass airflow sensor (MAF): the vane meter sensor and the hot wire sensor. The mass air flow (MAF) sensor provides the open-loop controller predicted air flow information (the measured air flow) to the engine control unit (ECU). Benefits The air mass information is necessary for the engine control unit (ECU) to balance and deliver the correct fuel mass to the engine. When a mass air flow (MAF) sensor is used in conjunction with an oxygen sensor, the engine's air/fuel ratio can be controlled very accurately. Thus resulting in optimum horsepower, fuel economy, and emissions. Symptoms of Failure SES/MIL/Check Engine Light Hesitation Bucking No Spark Long cranking time Stalling Sudden drop in RPM Surging Hard Shifting Loss of gas mileage Misfiring Replacement Open the hood to your vehicle and locate the engine air box.
Check your owners manual for the location of the air box. In some vehicles, it can look boxy, in others, it may be cylindrical.
Vehicle manufacturers do not always place the air box in the same location. Locate the mass air flow (MAF) sensor by opening the box that the new one came in and finding the same component inserted into the air tube running from the air box to the engine. The sensor comes in a variety of shapes and sizes depending on the vehicle, but most have an electrical plug the connects directly to them.Use the flathead screwdriver to release the lock and unplug the harness from the mass air flow (MAF) sensor. Open the air box and remove the air filter. On some vehicles, various screwdrivers may be needed including in some applications the use of a torx head screwdriver. Some air boxes have metal clips that require no tools and can be opened with the flick of a finger. Disassemble the air tube on either side of the mass air flow (MAF) sensor. In most applications there are band clamps present that can be loosened with a Phillips head screwdriver or a ratchet and socket. Remove the old mass air flow (MAF) sensor from the air tube assembly.
Install the new mass air flow (MAF) sensor to the air tube and reassemble the tubes to either side of it. This will attach the air tube back to the air box cover. Insert the new air filter into the air box and re-secure the cover. Plug the harness back into the new mass air flow (MAF) sensor outlet. Our Promise We guarantee all of our products to be guaranteed against DOA (Dead on Arrival).
Please make any address changes during checkout. We will do the same for you! The item "NEW SIEMENS VDO BMW MASS AIR FLOW SENSOR METER MAFS 330 530 X5 E39 E46 E53 01-06" is in sale since Sunday, February 26, 2017. This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts\Air Intake & Fuel Delivery\Sensors".
The seller is "milehighauto" and is located in Fort Collins, Colorado. This item can be shipped worldwide.