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Vacuum line diagram? Routing? Under manifold? Turbo. 850 1995

posted by Erwin on Sun Apr 4 09:16 CST 2010
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last visit: Thu Oct 23 10:39 CST 2014

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I have an on-going 2-3-1, 2-3-2 CEL and a very rough idle when cold. Idles better warm but not perfectly.

I've replaced the vacuum tree which was worn through, a few rotted elbows and even found some of the rigid plastic vacuum line had disintegrated in places, which I replaced with rubber vacuum hose. Everything was fine, then this latest situation.

Where does the elbow under the intake manifold feed? The elbow is good but I don't know where the other end goes.

Another point, on the air ducting downstream of the MAF, just before the turbo there is what looks like a PCV type valve with a vacuum line coming in from the side. Is this what ends up going to the elbow under the intake manifold, near the PS pump mentioned above?

Back near the turbo, there is a vac line on the WG actuator of course, but in that general area is one more device with a vac line that looks like it goes up to the vac tree near the throttle bellcrank. What is that device? The hose had slipped off off the nipple and I found it had been repaired before by splicing two together. (Had the car since 2000 and it wasn't me!)

Big question is, can anyone point me to a comprehensive 850T vac diagram? That would surely help knock this project out.

Thanks,

Erwin
'95 855T 155k
'94 945T 132k

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Vacuum line diagram? Routing? Under manifold? Turbo. 850 1995

posted by Goatman on Sun Apr 4 10:45 CST 2010
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last visit: Sat Jul 26 20:30 CST 2014

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Hi,

I just finished my 1996 850 turbo valve job. I know that device attached to the air box is the boost controller. There are three connections to the turbocharger. The line under the intake manifold goes to the fuel rail.

Goatman

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Vacuum line diagram? Routing? Under manifold? Turbo. 850 1995

posted by LilHelpHere on Sun Apr 4 13:16 CST 2010
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last visit: Wed Oct 15 22:09 CST 2014

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Here's a few URL's I collected a while back. You'll have to check them yourself and I hope they might help:

http://lakesidedp.com/uploadpics/pcv/

http://images.google.com/imgres?imgurl=http://www.fcpgroton.com/images/products/thumb/pcv9596_850T.jpg&imgrefurl=http://www.fcpgroton.com/category-exec/category_id/63/nm/Breather_System_PCV_/&usg=__PPNobp3xUWbHtJRnULS0O4-Skwk=&h=100&w=79&sz=4&hl=en&start=15&sig2=sOxTOa8mSJNG4dmekXgHuQ&tbnid=pPrHpvvTkygKpM:&tbnh=82&tbnw=65&ei=3t-YScyRItqhtwe4gq2lCw&prev=/images%3Fq%3DVolvo%2B850%2BPCV%2Bsystem%26gbv%3D2%26hl%3Den%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-US:official%26sa%3DG

I thought they did, But seeing the FCP site below -It's because of the manual transmission.
I wasn't saying that that's your trouble for sure -it just pops off sometimes. And it had popped off on mine.

my '97 NA has it and it was too hard to get to, so the indy did the repair
The hoses and elbows of the PCV, on both sides separate very easily on my car, and have been a little bit trouble.

Here are the different set ups
http://images.google.com/imgres?imgurl=http://www.fcpgroton.com/images/products/thumb/pcv9596_850T.jpg&imgrefurl=http://www.fcpgroton.com/category-exec/category_id/63/nm/Breather_System_PCV_/&usg=__PPNobp3xUWbHtJRnULS0O4-Skwk=&h=100&w=79&sz=4&hl=en&start=15&sig2=sOxTOa8mSJNG4dmekXgHuQ&tbnid=pPrHpvvTkygKpM:&tbnh=82&tbnw=65&ei=3t-YScyRItqhtwe4gq2lCw&prev=/images%3Fq%3DVolvo%2B850%2BPCV%2Bsystem%26gbv%3D2%26hl%3Den%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-US:official%26sa%3DG

Here is a manifold removed -full PVC replacement
http://lakesidedp.com/uploadpics/pcv/
in the bottom picture, just to the left of the bottom arrow head.

and this: http://volvospeed.com/Repair/knock_sensor.pdf on page 19

This thread is 3 pages long and has a lot of info if you can get through it:
http://volvospeed.com/vs_forum/index.php?showtopic=80459&st=0

same on turbo and NA ?
It depends on the tranny
--
'97 855na, Mobil 1, K&N, various IPD's and eBay's

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Vacuum line diagram? Routing? Under manifold? Turbo. 850 1995

posted by Erwin on Mon Apr 5 02:15 CST 2010
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last visit: Thu Oct 23 10:39 CST 2014

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Thanks for the links! Nothing works like pictures to see the routing. Best bet is to remove the manifold, airbox, ducting, etc and clean/replace all hoses, elbows, or anything age hardened or rotted.

We have no plans of replacing either this car or our '94 945T so doing it right is the only option.

Now I know what the PTC valve is. When I had the 2-3-1, 2-3-2 CEL last fall the vacuum line had slipped off the PTC nipple and was too enlarged and oily to stay put.

Mine is a Turbo btw.

I need to make sure our indy Volvo shop didn't mix up lines when I had them replace the broken vac line to the boost gauge. Good shop overall but I've found a couple of things on both cars they left undone.

Thanks,

Erwin
'95 855T
'94 945T

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