OK, so I was unable to remove the o2 sensors, either with heat or many dressings with lubrication.
So I booked it into a Volvo Specialist in Basingstoke (Ktek Automotive) and had them basically check the engine over and do some diagnostics to see if my theory that it was running rich was correct.
Annoyingly, even with a test drive on the road, they could not seem to hear the annoying chug that I hear when de-accelerating, or here any other engine noise that sounds odd.
The diagnostics came back clean and they gave the engine a clean bill of health. The only comment about a noise came when it was on their rolling road and they thought there might be a transmission related noise.
Essentially, the car has 131k on the clock, has never towed anything and has not had any transmission oil changes. The gear changes still feel ok to me, no warning lights at all of as far as I can tell gear performance issues.
What are peoples opinions on maybe getting a transmission change give the miles done and in the hope that it might eradicate the car of this ghastly noise?
The noise is definitely when I have taken my foot off the accelerator and I am coming to a stop.
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