question about pcv system

turbowagon_in_pa · Post by **turbowagon_in_pa** » 12 Sep 2011, 20:57

I'm new here so I'm hoping you guys can help me out. I just purchased a '95 850 turbo that needs the pcv system dealt with. After tearing into it, I can see that someone else has already had it apart and cleaned it at one point. The problem is, there a re two broken hoses that I have no idea where they go. The first one is coming off the passenger side of the intake manifold, there's about an inch of hose attached to a nipple, nothing else. Second, there are two hoses that run together to the flame trap, a larger on, and a small one, the larger one is connected to the flame trap, the small one is broken off, and was like that before I touched anything. Can someone help me with these two broken hoses. They don't appear as if they were actually connected together, but I could be wrong. Thank you in advance.

Post by **Ozark Lee** » 12 Sep 2011, 22:00

Welcome to MVS,

Some here have cleaned portions of the PCV "system" but for my part I just buy the kit, change everything, and I'm done with it for another 100k miles.

On all of mine the lines were so brittle that they broke anyway upon removal.

What doesn't come with the kit is a good way to secure the line from the PTC valve to the intake manifold. While you have the intake manifold off use a zip tie to cinch that one down before you re-install the intake manifold. After the intake manifold is back on it is a true nightmare to get hooked back up unless you have a daughter with very small hands like I do.

On a turbo you shouldn't have a flame trap like the NA cars have so I'm not sure which lines you are talking about. My guess is the line from the oil trap to the intake snorkel and the other line from the PTC to the intake manifold that are kinda molded together with the foam.

FCP Groton has a real good diagram of all of the parts on their parts page.

If you don't get things right you will have a P0172 in your future.

...Lee

txdscrt · Post by **txdscrt** » 12 Sep 2011, 22:18

Ozark Lee is completely right!
That little nipple on the passenger side of the manifold is connected to the little hose that runs together with the big hose that goes to the oil separator/flame trap, then they both run together back to the same place on the other end which is the PTC on the big intake hose. Don't forget to clean that PTC valve or else you might still have issues. Just be careful taking hoses off. From experience I've had to redo it several times because I wasn't thorough, the I just followed Ozark Lee's advice and replaced everything. My only problem was that the kit lines were like an inch too short. I still have to make a good splice somewhere (which I don't want) or else deal with a vacuum leak that I still can't find. LOL

Good luck! Look at jblackburn's thread on the PCV cleaning. He wrote it up nicely.

https://www.matthewsvolvosite.com/forums ... =1&t=28487

J.J.

Post by **vjaneczko** » 12 Sep 2011, 22:47

Ozark Lee wrote: What doesn't come with the kit is a good way to secure the line from the PTC valve to the intake manifold

The kit I got from FCP this spring had the hose built with a bend so I didn't need a rubber elbow, and a clamp for the end. It was really nice to see that I didn't have to suffer the hassle that so many had - the job took me way too long to begin with, I'm glad this wasn't one issue for me!

turbowagon_in_pa · Post by **turbowagon_in_pa** » 13 Sep 2011, 21:50

Thanks a lot guys, so the two broken hoses actually do go together. This site is a tremendous help.

turbowagon_in_pa · Post by **turbowagon_in_pa** » 19 Sep 2011, 18:59

I have another question about the pcv system. There's a sensor mounted to the airbox with three nipples coming off of it. One nipple has a hose connected to it that appears to run down behind the turbo. The other two nipples have nothing connected. The ptc valve, I believe it's called, also has a nipple on it with nothing connected. I'm sorry to be a pain, but your help would be greatly appreciated.

whoa · Post by **whoa** » 19 Sep 2011, 19:30

Does this help? https://www.matthewsvolvosite.com/forums ... =1&t=32575

turbowagon_in_pa · Post by **turbowagon_in_pa** » 19 Sep 2011, 20:43

That diagram helps, but it shows me that someone has really screwed up the routing of the vacuum hoses. On that sensor, it shows that the bottom hose should be connected to the waste gate, but I looked at it, and the hose coming from the waste gate is connected to a nipple at the front of the intake. According to the diagram, that nipple is supposed to have a hose from the pressure regulator. Please be patient with me on this. So, I have two more questions, can you tell me where the pressure regulator is, and also, I found another hose coming from under the battery tray that goes no where. Can you help me with that also. I'm really sorry about this. I'm frustrated to no end. I bought the car knowing that it needed work, but I wasn't expecting this kind of mess. Thanks.

Post by **jblackburn** » 19 Sep 2011, 20:55

It sounds like all of your vacuum lines are in very bad shape - or someone completely screwed them all up before you owned that car. I'd say you need to get a bunch of tubing (3.5, 4 mm for most lines; EVAP system lines are 6/8) and go through them all.

The red line goes from the TCV to the compressor bypass valve on the turbo. Yellow to the wastegate. Blue to the fresh air hose.

You can bypass the turbo control valve, but I'd think the car will be pissed off and throw a check engine light. Essentially your boost is working off manifold pressure right now. Old turbo cars used to do this long ago.

I believe on a '95 the fuel pressure regulator is under the fuel rail between cylinders 2 & 3.

Under the battery tray...does your car have an air pump? There will be a little silver valve at the back by the turbocharger.

Post by **vjaneczko** » 20 Sep 2011, 07:27

turbowagon_in_pa wrote:I found another hose coming from under the battery tray that goes no where. Can you help me with that also. I'm really sorry about this. I'm frustrated to no end. I bought the car knowing that it needed work, but I wasn't expecting this kind of mess. Thanks.

Yeah, you have a bit of a mess but it's easy to fix and once you have everything in place, you'll love it.

If it's not the vacuum hose for the SAS, your cruise control module is also under the battery so if it doesn't work properly, that 'hose to nowhere' is probably the culprit. You can pull the battery, unbolt the battery tray and the cruise module is bolted to the bottom of it (the 10mm bolt hold it in place IIRC). The hose would run towards the master cylendar to run into a corrogated tube to pass through the firewall. Now, if the hose fell off the module, you'll have to make sure it gets connected to the right nipple - there's one that doesn't get a hose at all. I don;t have a pic to post but you'll be able to search for one without problems.