1994 Volvo 850 Turbo PCV Replacement

Post by **jblackburn** » 10 Aug 2013, 22:00

I can see this now and this is correct. That red one actually runs from one of the two very large vacuum ports at the front of the intake manifold, just above the throttle body.

ManManOhMan · Post by **ManManOhMan** » 10 Aug 2013, 22:13

Sweet, so what size hose do you think I should run from the FPR to one of the vacuum ports?

Post by **jblackburn** » 10 Aug 2013, 22:16

I think...I think it's 8 mm.

Post by **jblackburn** » 10 Aug 2013, 22:17

Where that hose comes from on the intake manifold...the FPR is the one below that.

ManManOhMan · Post by **ManManOhMan** » 10 Aug 2013, 22:18

Red Arrow: This is the hose that doesn't connect to the manifold. Just leave it disconnected at the other end or should I try to connect another hose to and run it to a port on the vacuum tree?

Blue Arrow: That part off my hose is capped off.

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Post by **jblackburn** » 10 Aug 2013, 22:22

ManManOhMan wrote:Red Arrow: This is the hose that doesn't connect to the manifold. Just leave it disconnected at the other end or should I try to connect another hose to and run it to a port on the vacuum tree?

Blue Arrow: That part off my hose is capped off.

I'm confused. Both should end up with a vacuum source.

ManManOhMan · Post by **ManManOhMan** » 10 Aug 2013, 22:25

Sorry, I had to edit the last post, forgot to upload the picute

Post by **jblackburn** » 10 Aug 2013, 22:27

Ah. Yes.

On the 1998, that capped off one runs to my fuel pressure regulator. I do recall 850 models as being different (nice of Volvo to change it and confuse everyone, right). Leave that as-is.

Red one - I'd just leave it there, disconnected at both ends, and run a new line. Beats taking the intake manifold off again. This will provide vacuum at idle and reduce your PCV pressure up the dipstick [when idling].

ManManOhMan · Post by **ManManOhMan** » 10 Aug 2013, 22:35

Start from the PTC Nipple and just work my way back?

Does it matter which open port I use on the tree?

Also, do you think 8mm hose would be okay to use on both the FPR and the new route from the PTC nipple to tree?

Thanks J Blackburn you have helped me a lot!

ManManOhMan · Post by **ManManOhMan** » 10 Aug 2013, 23:09

Does this green line look like a sufficient way to bypass the metal vacuum line? It will go from the vacuum tree to the fresh air pipe.

The reason I ask is because I do not trust any vacuum line the way it's running from the previous owner. Here are two pictures I took

: This one runs to the tree

: This runs to my fresh air pipe

1994 Volvo 850 Turbo PCV Replacement

Re: 1994 Volvo 850 Turbo PCV Replacement