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'98 Volvo C70 2.5T atmospheric pressure sensor and high consumption

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
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

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RickHaleParker
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Re: '98 Volvo C70 2.5T atmospheric pressure sensor and high consumption

Post by RickHaleParker » Sun Mar 18, 2018 7:15 am

Now, however, I have the problem that this part is almost inaccessible for me.

Did you check accessibility from under the car?


Platform: P80 1998 C70, B5234T3, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.

Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0, Plant Torslanda Sweden.
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1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

SvenGWK
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Re: '98 Volvo C70 2.5T atmospheric pressure sensor and high consumption

Post by SvenGWK » Sun Mar 18, 2018 7:52 am

No, not yet. I have no way to lift the car. So I asked. It would be a pity to rent a lifting platform in a self-help workshop only to find out that i can't reach it from below.



scot850
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Re: '98 Volvo C70 2.5T atmospheric pressure sensor and high consumption

Post by scot850 » Sun Mar 18, 2018 8:31 am

If it is the hose from the TCV as you say to the bottom of the TBV it can be done from the top but is fiddly. A small mirror on a stick is handy to see what needs done, The pipe uses a spring clamp on it and the job needs to be done by feel.

Neil.
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2000 V70 R - still being an endless PITA
2006 XC70
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - New project and test bed - Sold

SvenGWK
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Re: '98 Volvo C70 2.5T atmospheric pressure sensor and high consumption

Post by SvenGWK » Sun Mar 18, 2018 8:51 am

Unfortunately, I have a screw clamp on there. I guess the bad accessibility will probably be the reason why it wasn't reasonably tightened. I can borrow a "workshop mirror" with illumination at work. Let's see, maybe I can get that fixed myself.
Thanks for the advice! :-)



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Re: '98 Volvo C70 2.5T atmospheric pressure sensor and high consumption

Post by scot850 » Sun Mar 18, 2018 3:07 pm

If the pipe is loose on the tube out from the CBV, then I would consider changing the tube altogether with the correct rubber hose to get a tight grip on the tube. The small diameter probably means the type of screw clamp can't pull tight enough at that small a diameter and hence the leak. I am happy to be corrected, but that pipe pulls a vacuum so any leak will prevent the CBV getting the vacuum to activate fully.

Neil.


2000 V70 R - still being an endless PITA
2006 XC70
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - New project and test bed - Sold

SvenGWK
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Re: '98 Volvo C70 2.5T atmospheric pressure sensor and high consumption

Post by SvenGWK » Wed Mar 21, 2018 12:54 pm

We exchanged it, but unfortunately it had not led to the desired effect yet.
Today I listened again to the running engine and discovered a hiss near the servo pump. A few minutes later I discovered some smoke with my torch light.
Well, what can I say: I had the suspicion that something was done wrong when changing the oil trap. On the left side of the intake manifold is a small hose connection from which the oil mist came. I also found the corresponding hose. It was not possible for me to connect it now due to the boiling hot cooling water pipe and the hot intake manifold, but I think tomorrow I will have a well running car again! ;-)
Can someone explain to me what exactly the small hose has for a function and whether a hose clamp is foreseen to secure it?
hose.jpg
hose.jpg (100.49 KiB) Viewed 1396 times



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erikv11
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Re: '98 Volvo C70 2.5T atmospheric pressure sensor and high consumption

Post by erikv11 » Wed Mar 21, 2018 6:05 pm

That small hose and nipple are part of the PCV system, it is infamous for the hose to fall off due to various reasons including just rotting away. Almost always throws a p0172 however, with the car otherwise running pretty normally. Hopefully there aren't other hoses or parts disconnected. Or maybe the Torque app is giving you there wrong code.

A hose clamp is not necessary, but it has one from the factory. A zip tie works well in there. Get some very long nose pliers to help you with the install.
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'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 140k
'98 S70 NA, 210k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 280k
'06 S60 R, 160k
gone: '96 NA 850 210k, '98 NA V70 182k

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