Matthew, Tsquared, thanks for your advice.

BTW, a contributor to the UK Volvo Owners' Club web site with the same problem suggested changing the spark plugs, because that worked for him. Unfortunately it did work for me.

There is no obvious sign of wear in the engine mounts. The V70 has clocked only 30,000 miles and most of this mileage is gentle driving on motorways (highways).

I have driven my 2000 manual 140hp 2.4 'new' V70 since it was new. It has the B5244S2 engine. A few months ago an annoying resonant vibration became noticeable. It occurs when accelerating under load through the 1900 - 2100 rpm band. It sounds like engine vibration causing something to resonate at i...