G/box: TF-80SCAWD: - howling and buzzing sound

wickey · Mar 27th, 2020, 13:23

Hello, I have noticed few weeks ago new sound coming from the gearbox (I think). 08 XC90 V8.

When cold (morning start), there is a howling / buzzing sound coming from the engine bay area. When reving in Neutral or Parking - no sound.

First few gear changes from cold start - sound leveling up with revs. After few changes less hearable, but noticeable when gearbox is "preparing" to change gear and changing gear. Both ways - up and down.

I am quite sensitive for new sounds coming from the car, but this is quite hearable... I have changed the transmission fluid (Mobil JWS 3309) and made adaptation trough vida-dice - no change.

Is my torque converter dying? or what could that possibly be?

Any comment is highly appreciated. Thanks in advance.

SwissXC90 · Mar 27th, 2020, 13:47

Howling when cold is generally a rubber belt: check your belts on the engine.

wickey · Mar 27th, 2020, 13:54

true, but it was changed few thousand km back. Currently I have 185000 km on odometer.

My subjective feeling is, that it comes from left side of the car (gearbox), not from the right side (belt).

It is more a buzzing than howling. Quite difficult to decribe

wickey · Mar 30th, 2020, 11:06

here I have tried to capture the sound - https://www.youtube.com/watch?v=RBOg6Yk_4o4

4 minute video - best hearable in the second half.

My todays first cold drive - quite cold outside (3 degrees celsius).

Mar 27th, 2020, 13:23	#1
wickey Junior Member Last Online: Nov 12th, 2023 12:04 Join Date: Nov 2006 Location: Bratislava / Slovakia View Photos By: wickey	howling and buzzing sound Hello, I have noticed few weeks ago new sound coming from the gearbox (I think). 08 XC90 V8. When cold (morning start), there is a howling / buzzing sound coming from the engine bay area. When reving in Neutral or Parking - no sound. First few gear changes from cold start - sound leveling up with revs. After few changes less hearable, but noticeable when gearbox is "preparing" to change gear and changing gear. Both ways - up and down. I am quite sensitive for new sounds coming from the car, but this is quite hearable... I have changed the transmission fluid (Mobil JWS 3309) and made adaptation trough vida-dice - no change. Is my torque converter dying? or what could that possibly be? Any comment is highly appreciated. Thanks in advance. __________________ 2001 C70 T5 Convertible - B5234T3 M56LK 2000 V70 XC AWD Cross Country - B5244T M58 2008 XC90 V8 Sport - B8444S AWTF-80 SC

Mar 27th, 2020, 13:47	#2
SwissXC90 Premier Member Last Online: Mar 20th, 2024 18:26 Join Date: Jan 2016 Location: Cross Country	Howling when cold is generally a rubber belt: check your belts on the engine. __________________ XC90 R-Design MY2009, Black Sapphire Metallic. HP-Sound, RSE, Nav, Tel, ParkingCam, BLIS, ParkingHeater, RestHeat, Removable Towbar, Summer: CRATUS 20x8 on Pirelli Scorpion Zeros 255/45, Winter: NEPTUNE 17x7 on Continental WinterContact 4x4 235/65.

Mar 27th, 2020, 13:54	#3
wickey Junior Member Last Online: Nov 12th, 2023 12:04 Join Date: Nov 2006 Location: Bratislava / Slovakia View Photos By: wickey	true, but it was changed few thousand km back. Currently I have 185000 km on odometer. My subjective feeling is, that it comes from left side of the car (gearbox), not from the right side (belt). It is more a buzzing than howling. Quite difficult to decribe __________________ 2001 C70 T5 Convertible - B5234T3 M56LK 2000 V70 XC AWD Cross Country - B5244T M58 2008 XC90 V8 Sport - B8444S AWTF-80 SC

Mar 30th, 2020, 11:06	#4
wickey Junior Member Last Online: Nov 12th, 2023 12:04 Join Date: Nov 2006 Location: Bratislava / Slovakia View Photos By: wickey	here I have tried to capture the sound - https://www.youtube.com/watch?v=RBOg6Yk_4o4 4 minute video - best hearable in the second half. My todays first cold drive - quite cold outside (3 degrees celsius). __________________ 2001 C70 T5 Convertible - B5234T3 M56LK 2000 V70 XC AWD Cross Country - B5244T M58 2008 XC90 V8 Sport - B8444S AWTF-80 SC

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