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850 / S70 & V70 '96-'99 / C70 '97-'05 General Forum for the 850 and P80-platform 70-series models |
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Manifold vacuum hoseViews : 909 Replies : 2Users Viewing This Thread : |
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Jul 6th, 2020, 22:32 | #1 |
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Last Online: Jul 18th, 2020 22:49
Join Date: Nov 2010
Location: Inverness
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Manifold vacuum hose
Got a wee question, what purpose does this vacuum line serves on the manifold. Car seems to run better if I block the hose.
Added the picture below Thanks |
Jul 10th, 2020, 23:40 | #2 |
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Last Online: Jan 24th, 2024 17:38
Join Date: May 2019
Location: Nottingham
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Not sure the exact purpose (idle vacuum and/or vapour extraction), but I think if you follow the pipe under the manifold it has a non-return valve in it. I think it should close under positive pressure/boost, so this might explain why it runs better if you block it off. Have a look at Volvo Part number 1275226 to see what I mean. I have found they can stick open.
Hope this helps. |
Jul 16th, 2020, 20:53 | #3 |
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Last Online: Jul 18th, 2020 22:49
Join Date: Nov 2010
Location: Inverness
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Thanks for the reply, I will try to play with them, maybe I have put them wrong.
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