97 V70r turbo/boost issue

[Dangerous Dave]

I disconnected one of those plastic check Valves and blew into it. It will take air either way, so presumably it's fecked. Was going to replace with aluminium ones, but the OEM versions have 8mm outlet and 11mm inlet. Very odd, but very difficult to get so it seems. I guess Ovlov only??

That would probably be it

I did try to get some from Volvo some years ago and just for one check valve it was £49.

Thanks - somebody over on the Facebook forums said he tried to get them from Volvo recently but they are now discontinued. No matter, I have ordered some 10mm ally ones off Fleabay cheap and will give those a go before attempting to source something better (if)

Reckon I should be able to stretch 8mm vac pipe over a 10mm nipple...

I got some 8mm inlet/outlet aluminium fuel check valves off ebay for about £3 each and bought some 8mm black silicon hose as the original stuff was perished anyway. Then stretched the 8mm hose onto the T piece after the valve, has been fine for the last 8 years.

Fingers crossed this is the problem