If the crack is large enough to cause a vacuum leak, the readings collected by the MAF sensor and the actual volume of air that enters the engine won’t match up. This could also cause some faulty MAF symptoms, even though your mass airflow sensor is perfectly fine. $272.95. Volvo Mass Air Flow Sensor 31342521. PART # 31342521. The Mass Air Flow (MAF) sensor is placed in the stream of intake air. It measures the intake flow rate by measuring a part of the entire intake flow. It consists of a hot film that is supplied with electric current from the Engine Control Module (ECM). The temperature of the hot film is controlled by the ECM a certain amount.
You can get the exact same MAF sensor from a Hyundai Sonata 2.5L for your E46. Just do a search for that on here. I'm not sure which model you have but I remember reading it fits the 330i. You can pick it up from Hyundai for a fraction of the price that BMW charges for the same Seimens part number.
Too much oil on the filter. MAF is least of your problems, you can ruin the transmission as well. GM has a service bulletin voiding all warranty & repairs originating from "oil bath filters" as they call them. # 04-07-30-013. Put the original filter box and OEM filter back in it, problem solved. Step 2 – Remove the MAF sensor. There are two hose clamps on each side of the MAF sensor that hold it in place. Use a flat head screwdriver to loosen the hose clamp screws. Pull the air inlet hose off the sensor, and then pull the sensor off of the air filter housing. Figure 3. Here are the most common symptoms of a bad or failing MAF sensor: Idle Issues – Your A4 may run rich or lean when idling, or it may also idle erratically. A rich condition is when there is not enough air relative to the fuel in the air/fuel mixture. The exhaust color is usually darker when running rich. A lean condition is when there is too
The 03/2003 and later E46 use the 6 pin MAF connector. The MS45 ECM gets the Intake Air temperature from the MAF, the earlier MS42-43 ECM uses a temp sensor in the intake manifold. The M56 325 engine uses the same size MAF as the 330 models. Join the BMW Car Club of America.
Here are a few reasons you might be experiencing symptoms of a bad mass air flow sensor: Contamination: Dirt, dust, or debris can accumulate on the sensor's wire or film, impairing its function and causing false readings. Exposure to water or oil: When moisture from water or oil vapor enters the intake system, it can coat the MAF sensor. I changed the air mass sensor 2nd hand original as the 1st one was faulty but I still have a code : 08 DME: Signal, Air-Mass Flow Sensor . So far the car works fine and doesnt stall or engine check light . I tested the sensor with multimeter and seemed tha the voltage is constant , when you accelerate it doesnt drop . Ep6BF.
