Question about 2003 Volkswagen Jetta TDI

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99 VW Passat Engine Humming Noise

I know I need a new mass airflow sensor and my Serpentine belt is cracked and needs to be replaced. VW stated to fix this and if the noise persist then it is something else and wants more money. Anyhow, the problem I want to fix is the when I accelerate my vehicle makes this electric humming noise. The best way to describe it is like an electric car. You know how they have that low buzzing noise when they accelerate, that is what my car does and has never done it before. If I turn on the air conditioner my vehicle also makes that normal I'm working hard noise, however now the noise also entails that buzz. Any ideas? I just hope it is the belt thats cracked. In all I just want that noise to stop, people turn their heads when I drive down the street. I just tell them its an electric car.

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It could be your alternator has gone bad and over charging the electrical system and the bearing to the alterntor has gone bad also and will need to be replaced soon as posible. If you have a volt meter check the voltage at the battery when the care is running and there should be no more then 13.5 volts, anthing higher and your going to need a new battery soon. If there a Auto Zone around your area, they can check the voltage for you and may be determine where the noise is coming better then us on line since where not there. Good luck and hope this helps. If it is the alternator, Auto Zone may and can order the parts and give the step by step instructions to replace the parts with common tools or ask one of the guys to help you work on the car after work for less then the dealer's cost for the repairs. Good luck and keep me posted. be glad to help you get your car running 100% again soon.

Posted on Jul 12, 2009


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try cleaning the mass airflow sensor, and change the PCV valve. I would replace the PCV valve first cause that could cause it and its a cheap and easy fix, could be stuck and gunked up or clogged and barely any air is moving into the intake, if you clean the mass airflow sensor be careful not to touch the element and not to drop it handle with care it's expensive and is a fragile part, and use mass airflow spray cleaner only. Try that see if it fix's the problem if not I would check your vacuum lines particularity the ones going in and out of the intake from the pcv valve and the one going from the airbox to the engine, then check if any of the other small lines from your EGR are all connected and not cracked broke or damaged

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