I had the same problem and it turned out to be the swirl flap arm had detached. I re-fitted it turned over by 180 degrees as the 'lobes' had worn and it has been fine ever since.
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XC90 SE D5 2004 : S80 SE Sport D5 2007
S60 D5 SE 2002 : S80 D5 Exec 2003
V70 SE Bi-Fuel 2003 : S60 2.4D SE 2004
Last edited by wendash; Jun 29th, 2022 at 08:59.
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