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1998 Volvo S70 PCV System

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.
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1998 Volvo S70 PCV System

Postby wtharpervolvo-98 » 30 Nov 2009, 21:07

My 180,000 mile S70 I believe is in dire need of the PCV System to be cleaned. Has anyone actually done this themselves? From what I have read, it seems like a chore but not impossible for a shade tree type mechanic.

Thanks for any feedback!
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Re: 1998 Volvo S70 PCV System

Postby polskamafia mjl » 30 Nov 2009, 21:31

Is your s70 N/A or turbo and also have you done the dipstick test? For the most part, N/A cars do not clog their PCV systems, it is usually just the flame trap that needs to be cleaned.
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Re: 1998 Volvo S70 PCV System

Postby misha » 30 Nov 2009, 23:47

I agree with polskamafia.

But,as far as i remember,in s/v70 models from '97-'99,flame trap shouldn't be present in flame trap housing.

I think that those models years came from the factory without flame trap installed.

P.S Read the article at the end of this page:
http://www.volvospeed.com/Repair/ftrap.php
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Re: 1998 Volvo S70 PCV System

Postby confused_al » 01 Dec 2009, 02:29

polskamafia mjl wrote:N/A cars do not clog their PCV systems,

I can't agree with that, the bottom hole on my engine block (95 n/a) was 80% clogged when I took the oil trap out , not to mention the top hose was very clogged at the trap end as well.
wtharpervolvo-98 wrote:Has anyone actually done this themselves?

Yes, here is the write-up:
http://volvospeed.com/vs_forum/index.ph ... el-98-v70/
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Re: 1998 Volvo S70 PCV System

Postby polskamafia mjl » 01 Dec 2009, 02:37

polskamafia mjl wrote: For the most part, N/A cars do not clog their PCV systems, it is usually just the flame trap that needs to be cleaned.


It can and will happen to some people. However, turbo cars are more susceptible to PCV problems than N/A cars.
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Re: 1998 Volvo S70 PCV System

Postby wtharpervolvo-98 » 17 Dec 2009, 20:13

Thanks for the feedback. My car is not a turbo. I'll look into the flame trap.

Sorry it took so long for me to reply, I had to deal with a broken top motor mount bushing. Not the easiest thing to replace with an OEM part.
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Re: 1998 Volvo S70 PCV System

Postby Ozark Lee » 18 Dec 2009, 02:24

It can and will happen to some people. However, turbo cars are more susceptible to PCV problems than N/A cars.


I'm not sure where that myth came from, all of my 850s have had PCV issues at around 140k, both of the N/A models and the turbo. Internally it is all the same no matter what is happening above the head. The turbos do have the unique issue of the PTC valve clogging and the N/A models have the unique issue of the flame trap clogging, until you just take the flame trap out and throw it away, but those or more or less just different implementations of the same problem area.

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Re: 1998 Volvo S70 PCV System

Postby confused_al » 18 Dec 2009, 13:57

Ozark Lee wrote:I'm not sure where that myth came from, all of my 850s have had PCV issues at around 140k, both of the N/A models and the turbo. Internally it is all the same no matter what is happening below the head.

I am NOT confused any more!
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Re: 1998 Volvo S70 PCV System

Postby januwan » 18 Dec 2009, 21:28

confused_al wrote:
Ozark Lee wrote:I'm not sure where that myth came from, all of my 850s have had PCV issues at around 140k, both of the N/A models and the turbo. Internally it is all the same no matter what is happening below the head.

I am NOT confused any more!



Plus one.... see my thread above due for PCV job
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