Tracking down where this noise is coming from.....

liviococcia · Post by **liviococcia** » Sat May 05, 2007 9:20 am

Hello Members
I seem to be getting a humming/buzzing sound inside, it's eminating around the front passenger door area, but carn't be sure, it sounds like when something is very close together, but not tight up to each other, i can hear it but carn't precisely pin-point it's origin.

The sound only occurs when the car has started from cold, the vibrations from the engine are slightly more, the engine note is slightly different, this humming will only happen when i'm driving, and only during a small window of opportunity, once the engines warmed up a little more the humming has gone (engine note and vibration is different).

So i know it's engine vibration making something vibrate thats not fixed down inside the car, around the front passenger area maybe in the door area, my question is, does anyone have a clever way of tracing what it is.

I have tried with someone else in the car listening, but it doesn't do it so clearly ( i think ther presents is muting the effect), if they drive the car, they won't find the sweet spot on the gas pedal to make it happen before the chance has gone.

I also know there is nothing abnormal with the engine, it's sound or vibration, or the engine mounts in anyway.

Can anyone offer a clever way to find out where this noise is coming from?

The cars a VW Polo 1.4 E Automatic year 2001, it has hand winding windows, i have had the front passenger door panel off to see if anything looked unaturally loose, but doing this dosn't help as anything could be the culprit, i've also driven the car without the door panel, the noise will occure but i still carn't hear where precisely it's coming from, i'm not able to lean close enough and still drive.

A clever suggestion would be great.

kind regards
livio

Post by **alexperkins** » Sat May 05, 2007 6:40 pm

Recommend moving this to the MKV forum seeing as thats what ure car is dude

Peace

Petrol_Head · Post by **Petrol_Head** » Sat May 05, 2007 10:45 pm

I think it maybe "hunting"

This is the nickname i have heard for a problem that sounds very similar.. if your cars iddle spead wavers at the same time you have this problem ... when the car makes the different sound and vibrates a bit more than normal... then their are a nu mber of things to check...

I would say main things are:

Check the air pipes and that your air filter has been changed recently or even just cleaned.

The other thing you could do is clean the throttle body.

Godd luck

liviococcia · Post by **liviococcia** » Mon May 07, 2007 10:29 am

Thanks for replying Petrol_Head, there no noise during idling, in-fact there is no noise when the cars not moving, this high pitch buzzing/humming only occurs from when the car is about a quater warmed up on the water temp guage, and, while i'm driving say up a hill, and then it only last for about 5 mins, it's at that point when the car is not quiet fully hot.

The sounds not coming from anywhere near the engine, but from something inside the car around the front passenger area, but for that small period of time you can feel a very very slight "engine not hot" feel to it.

It's defiantly resonance between two parts inside the passenger area of the car, but to pin-point it seems almost impossible.

I just don't think the engines hunting at-all, the engine sounds and feels fine, and the car drives well.

regards