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98 V70 N/A PCV system swap to 96 850 N/A

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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SonicAdventure
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98 V70 N/A PCV system swap to 96 850 N/A

Post by SonicAdventure » Thu Jun 04, 2020 9:31 pm

Hey everyone,

I am getting ready to swap the PCV system that I pulled from my 98 NA into my 96 NA. Both cars are auto trans.

I know I will have to get a new intake manifold gasket, but online retailer's rep is saying the unit I have (the main box, and the four main hoses, two to engine block and one going into the head and one going over the throttle body) are not correct for a 96. I can't figure out why, they look exactly the same.

What would the reasons be for a difference between a 96 PCV box and main hoses and a 98 PCV main box and hoses, assuming both are non-turbo and automatic?

Thanks.

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SonicAdventure
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Re: 98 V70 N/A PCV system swap to 96 850 N/A

Post by SonicAdventure » Thu Jun 04, 2020 9:36 pm

Here is the whole unit and the part number on the main large hose:
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3F52689B-7822-41BB-98A7-7149B951C552.jpeg
1B1748E2-55CA-4F97-BADB-B1140058F736.jpeg

scot850
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Re: 98 V70 N/A PCV system swap to 96 850 N/A

Post by scot850 » Thu Jun 04, 2020 11:24 pm

Can't think why either. I do recall there was a change I think in the PCV box but I think that was earlier than 96.

The 2 hoses to the block I believe are the same, as it the one to the head. That leaves the breather hose to the flame trap. If they look the same then they are. Is the engine the original?

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

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misha
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Re: 98 V70 N/A PCV system swap to 96 850 N/A

Post by misha » Fri Jun 05, 2020 1:44 am

Check pcv box part number.There are 2 kind of pcv box...with different part numbers for '96 & '97 850.
My '97 have exactly the same setup like s,v70 from '97 and '98.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

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erikv11
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Re: 98 V70 N/A PCV system swap to 96 850 N/A

Post by erikv11 » Fri Jun 05, 2020 3:14 am

What misha said.

There are two different boxes, each takes slightly different shaped hoses for the little side hoses. However it is not true that they only fit specific years. As long as you have the right combo of small hoses and box, you can put it on any NA. The engine blocks are all the same.
'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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SonicAdventure
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Re: 98 V70 N/A PCV system swap to 96 850 N/A

Post by SonicAdventure » Sat Jun 20, 2020 3:05 pm

So, interesting update...

After doing a more thorough review of the current 96 set up, it appears the main hose to the air intake/flame trap area is different. There is a little line running to the vaccum tree that was not on the 98. Also, there seems to be no small vaccum line coming out of the passenger side end of the intake manifold like the 98 had. I guess at the very least, that main hose setup is different in the 96.

When I got this car last year, I just assumed the PCV was plugged and pulled the dipstick out about 1 inch to allow relief of pressure. I knew I would get around to it “eventually” but needed to do more important items first. I don’t know why I didn’t do this before, but I did the glove test last weekend. It was sucking in pretty hard at the oil filler cap even with the dipstick pulled. When I put the dipstick in all the way, it almost sucked the glove into the engine. It seemed to have as much intake suction as my 98 did on the first day I replaced the PCV system, which was about 90% clogged in the bottom black box port and had smoking dipstick and blew up the glove like a ballon prior to the repair.

I don’t have any maintenance records on the car, and it’s 24 years old. I know the PCV system is an interval/must-do in many circumstances, but this one seems to be working properly. I was thinking I’d let it go for now and commit to doing the glove test every 3,000 miles or so. The car has 82,000 original miles.

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Re: 98 V70 N/A PCV system swap to 96 850 N/A

Post by erikv11 » Sat Jun 20, 2020 4:17 pm

The emissions sticker under the hood will likely reflect those novelties. Would be interested to see it for comparison. :)
'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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