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1998 v70xc turbo pressure port

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
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1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

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Year and Model: 1998 v70xc
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1998 v70xc turbo pressure port

Post by RobertIbe » Mon Apr 20, 2020 6:40 pm

Help please, I am replacing the vacuum/pressure hoses on my 1998 v70xc as they are getting old and I have it apart for some other work. I have replaced the line going to the turbo pressure port next to the turbo inlet (red hose in the photo only attached on the turbo end)and when I apply pressure/vacuum it acts like there is a check valve it flows freely when pressure is applied to the line towards the turbo and barely flows when a vacuum is applied , is this normal??? Thanks.

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Re: 1998 v70xc turbo pressure port

Post by bmdubya1198 » Mon Apr 20, 2020 6:57 pm

So you're saying that the vacuum port on the turbo is acting as a one-way valve? I'm not sure that it's supposed to work that way, but I haven't exactly tried, either.
That red hose from the compressor housing that you're referring to is supposed to give the boost signal to the TCV, so it knows when to open.
2000 V70R Venetian Red/Charcoal M56 Swapped 195k
2003 S60 2.4T Silver/Black 112k
2007 XC90 V8 AWD Sport Titanium Grey/Black 166k
1991 944 Turbo Dark Green/Beige 173k
1992 245 Base White/Beige 249k
2006 BMW 330i
2000 S70 GLT Mystic Silver/Taupe 253k
1993 944 Base Beige/Beige 221k
1998 V70 GLT Black/Beige 199k
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1995 850 GLT Tropic Green... crushed
2001 S60 2.4T Black/Black 230k
1988 744 Turbo M46 Beige Metallic/Beige 188k

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