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Broken vacuum line?

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

JLv70t5
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Broken vacuum line?

Post by JLv70t5 » Wed Jun 03, 2020 4:01 pm

1998 v70 t5. Replaced my boost control valve today and noticed this vacuum line was broken off I have no idea where it's supposed to go. I have an intermittent service light for EVAP. Is this related? Can anyone help me out?
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erikv11
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Re: Broken vacuum line?

Post by erikv11 » Wed Jun 03, 2020 8:41 pm

That one connects to the TCV, to the straight nipple on the end with the two nipples. I'd wholesale review all of the vacuum lines.

EVAP code is probably one of the other, 22 year old vac lines has crumbled or has a pinhole etc. Likely unrelated.

That current open line is allowing unmetered air into the intake past the MAF, so the engine is running lean (very bad) or the ECU is compensating and it is running rich (less bad but still undesirable).

Frankly I would plan to replace all of the vacuum lines. But start with re-plumbing the TCV lines, go from there.
'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 145k
'98 S70 NA, 220k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 286k
'06 S60 R, 167k
'99 Camry V6 :shock: 125k
gone: '96 NA 850 210k, '98 NA V70 182k

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RickHaleParker
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Re: Broken vacuum line?

Post by RickHaleParker » Wed Jun 03, 2020 8:49 pm

Take the big air hose off. You will find the other end of the small hose below and near the back of the head.
--------
Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.
Platform P2 2004 S60R, B2524T4, AW50/51 AWD, B8444S TF80 AWD, Bosch Motronic 7.0, BorgWarner K24 turbocharger. V8 conversion in progress.

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erikv11
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Re: Broken vacuum line?

Post by erikv11 » Wed Jun 03, 2020 8:55 pm

RickHaleParker wrote: ↑
Wed Jun 03, 2020 8:49 pm
Take the big air hose off. You will find the other end of the small hose below and near the back of the head.
You think this goes back to the FPR? I think it's to the TCV ...
'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 145k
'98 S70 NA, 220k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 286k
'06 S60 R, 167k
'99 Camry V6 :shock: 125k
gone: '96 NA 850 210k, '98 NA V70 182k

JLv70t5
Posts: 10
Joined: Mon May 18, 2020 11:16 am
Year and Model: 1998 v70t5
Location: Maine
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JLv70t5

Re: Broken vacuum line?

Post by JLv70t5 » Wed Jun 03, 2020 9:11 pm

If I'm not mistaken the tcv (turbo control valve) is the same a the bcs (boost control solenoid) wich is the part a just replaced. Definitely not to that. What's the fpr?

JLv70t5
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Re: Broken vacuum line?

Post by JLv70t5 » Wed Jun 03, 2020 9:53 pm

erikv11 wrote: ↑
Wed Jun 03, 2020 8:55 pm
RickHaleParker wrote: ↑
Wed Jun 03, 2020 8:49 pm
Take the big air hose off. You will find the other end of the small hose below and near the back of the head.
You think this goes back to the FPR? I think it's to the TCV ...
I found this forum
viewtopic.php?f=1&p=276263#p276263

This is definitely it. Thanks for the help

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Re: Broken vacuum line?

Post by RickHaleParker » Wed Jun 03, 2020 10:00 pm

erikv11 wrote: ↑
Wed Jun 03, 2020 8:55 pm
You think this goes back to the FPR? I think it's to the TCV ...
I just took a quick look at my "98 C70 to see where the line is heading.

The other end terminates at a air pipe. Nipple at the metal pipe.
IMAG0079.jpg
These users thanked the author RickHaleParker for the post:
JLv70t5
--------
Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.
Platform P2 2004 S60R, B2524T4, AW50/51 AWD, B8444S TF80 AWD, Bosch Motronic 7.0, BorgWarner K24 turbocharger. V8 conversion in progress.

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erikv11
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Joined: Sat Jul 25, 2009 2:03 pm
Year and Model: 850, S/V70, 06 S60R
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Re: Broken vacuum line?

Post by erikv11 » Wed Jun 03, 2020 10:26 pm

FPR it is!
These users thanked the author erikv11 for the post:
JLv70t5
'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 145k
'98 S70 NA, 220k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 286k
'06 S60 R, 167k
'99 Camry V6 :shock: 125k
gone: '96 NA 850 210k, '98 NA V70 182k

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