XC70: General - Vibrations before downshift

urban60 · Mar 19th, 2024, 07:29

What could cause annoying rough vibrations, most felt on the seat, at low RPM (@ 1200RPM) or right before downshift? This only occurs when engine is hot AND outside temperature is 10°C or more. This wasn't happening months ago in the winter, even if the engine was hot. This is noticeable in gears only around 30, 50 and 70 km/h.
Vibrations feel like phone vibrating, a lot stronger of course.

No difference after transmission oil flush (at Volvo dealer).

Car:
XC70 D4 AWD (Polestar map) 220hp 2016.
Milage: 130.000 km

apersson850 · Mar 19th, 2024, 09:16

Especially later models are programmed to try to minimize fuel consumption. One of the actions is to hold on to a higher gear sometimes a bit too long.
When it's cold outside it allows more lockup release, to keep the oil in the gearbox warm.
My 2012 occasionally stays in a gear all the way down to 1000 r/min. That I do notice too.

urban60 · Mar 19th, 2024, 09:42

I was afraid it has to do something with the mechatronics in the gearbox, because my father has xc60 2015 D5 AWD and it doesn't have such symptoms or it's rather not noticeable as much.

apersson850 · Mar 21st, 2024, 12:35

And our XC70 D4 2016 doesn't behave exactly like the XC70 D5 2012 either. Part of that is due to different final drive, but the software's strategy for gear management is problably not identical either.

urban60 · Mar 22nd, 2024, 10:04

Makes sense. Thank you for our input. I guess I'll just have to get used to it.

Mar 19th, 2024, 07:29	#1
urban60 Junior Member Last Online: Mar 22nd, 2024 10:05 Join Date: Sep 2017 Location: MS	Vibrations before downshift What could cause annoying rough vibrations, most felt on the seat, at low RPM (@ 1200RPM) or right before downshift? This only occurs when engine is hot AND outside temperature is 10°C or more. This wasn't happening months ago in the winter, even if the engine was hot. This is noticeable in gears only around 30, 50 and 70 km/h. Vibrations feel like phone vibrating, a lot stronger of course. No difference after transmission oil flush (at Volvo dealer). Car: XC70 D4 AWD (Polestar map) 220hp 2016. Milage: 130.000 km

Mar 19th, 2024, 09:16	#2
apersson850 Premier Member Last Online: Yesterday 13:07 Join Date: Jul 2011 Location: Traryd View Photos By: apersson850	Especially later models are programmed to try to minimize fuel consumption. One of the actions is to hold on to a higher gear sometimes a bit too long. When it's cold outside it allows more lockup release, to keep the oil in the gearbox warm. My 2012 occasionally stays in a gear all the way down to 1000 r/min. That I do notice too.

Mar 19th, 2024, 09:42	#3
urban60 Junior Member Last Online: Mar 22nd, 2024 10:05 Join Date: Sep 2017 Location: MS	I was afraid it has to do something with the mechatronics in the gearbox, because my father has xc60 2015 D5 AWD and it doesn't have such symptoms or it's rather not noticeable as much.

Mar 21st, 2024, 12:35	#4
apersson850 Premier Member Last Online: Yesterday 13:07 Join Date: Jul 2011 Location: Traryd View Photos By: apersson850	And our XC70 D4 2016 doesn't behave exactly like the XC70 D5 2012 either. Part of that is due to different final drive, but the software's strategy for gear management is problably not identical either.

Mar 22nd, 2024, 10:04	#5
urban60 Junior Member Last Online: Mar 22nd, 2024 10:05 Join Date: Sep 2017 Location: MS	Makes sense. Thank you for our input. I guess I'll just have to get used to it.

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