CONTINUOUS BUZZ

[Babis]

Hello to everyone,
The last month when car runs at any speed in gear(D) I noticed a deep constant continuous buzz can hear which stops when changed to neutral(N). Any idea what could might be?
Thanks...

[WRe]

Hi,
did you check your transmission oil: correct level* - too less, too much, color - dark, debris, smell - burned?
...WRe

* Check when engine and tranmission are warm and engine running.

[kampala]

One possibility:

You should search and read about "screaming speedometer" or "screaming tachometer".   Both can make a buzzing sound which can go into a screaming sound.   When the buzz happens, put your fingers on the Tach and see if you feel a vibration.

Since you say, the buzz goes away when in neutral, but still at speed, this should eliminate the speedo and still leaves the tach at possible suspect. 

[Babis]

Thank you for the response
I'm sure its not speedometer or tachometer. I know how does they sound.

[Babis]

Thank you
Everything checked! To be specific that deep buzzing sound appears when the engine runs hot and after 5-10 km.

[Pawel66]

Does the buzz change with speed?
Does it buzz when you stand still and engage D?

i asked these as I had a similar buzz when gear engaged on another car - it turned out to be differential buzzing when load was applied. But if you say it depends on temperature, then I think it is not that probably, so I modified post after you added yours above.