I posted a response then realized that it's for an '01 S60...and not an 850 or 70 series car (so deleted what I wrote earlier, but can't delete the entire post now...so I'll ramble on) so I'm not sure what to say. Could be the purge valve as you suspect. Not sure where it is on your car, but on ours it's near the top of the radiator, under the front cowl and a small hose runs in it and out of it. It's very easy to do it ourselves on our cars. Could be this or your gas cap seal is just bad, or some small vacuum hose(s) that are leaking. Good luck!
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1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon. My cars have been running so well lately they've got me worried.
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