Vacuum lines for non turbo 850

Flybri15 · Post by **Flybri15** » 28 May 2011, 00:05

I bought a 97 850 for my sons first car, the problem I soon ran into was the previous owner abused this poor car and not knowing anything about Volvos prior to buying it, I've been burried with issues that needed repair. So far I have changed the starter, PNP switch, MAF sensor, battery. O2 sensor, had the dash out because the previous owner had chosen to pry the top off instead of take it apart breaking most of the dash, and also changed the small gear for the odometer. For 6 months I have been trying my best to put this car back together. For the most part with a ton of help from all of you I have been very sucessful, but my problem now is the engine seems to run fine at speed, but it idles loudly with a vibration and about 1000 RPM, and lets out some smoke as you rev the engine. When I got the car there were several vacuum hoses broken or missing, I've done the best I can to put them back but I dont think I have them all in the correct spot, and the diagram that "made in Japan" posted is great but I am having a hard time comparing what i have vs the chart. I think the engine is sound but I have a feeling the vacuum lines are wrong. No leaks detected at all, but I do have a check engine light with a P0102 code. (thats why I changed the MAF sensor, (it had an open circut). I think I have reached the end of what I can do and the local Vovlo dealer told me they dont work on anything older than a 98. Any suggestions or pictures will be greatly appreciated.

andy86+volvo · Post by **andy86+volvo** » 28 May 2011, 20:56

Hey buddy I feel your pain. I'm currently experiencing the same kind of thing. I have recently completed the PCV repair and since then have had very similar problems. With some research and LOTS of advice from this forum and tinkering have determined it to be my intake gasket.

I don't have any idea how close to the same our cars are since mine is a 95 but I did take some pics of the vacuum tree to refer to in case I needed them on reinstallation. I will post them tomorrow and mabye they will help you out. If you took the intake off to do the starter that would be my first guess is a gasket leak. I thought I had done something horribly wrong to my car judging by the way that it is running. It's amazing how much of an effect that can have on your car. Hope this helps

Flybri15 · Post by **Flybri15** » 28 May 2011, 21:46

I didnt remove the intake manifold to change the starter, though there were times I wish I had. The pictures will be great to see. I wouldn't think there was too much difference between the years, so that should help a lot.
Thanks Andy

andy86+volvo · Post by **andy86+volvo** » 29 May 2011, 14:31

Here are the pics I promised hope they are helpfull to you.

keybuster324 · Post by **keybuster324** » 29 May 2011, 19:01

I just went through a similar hunt for vacuum leaks. I had several, starting with one caused by my using the wrong intake manifold gasket - i got one for without air-pump and it didn't line up correctly.

The vac hose in the second pic ( running under the fuel rail) is easier to replace if you take the fuel rail and injectors off, it is probably time to replace those seals anyway - they were only $10 - $15 from FCP anyway. Replace all hose elbows at the vacuum tree and then follow them to the other end and replace them too. I replaced the big vac. hose from the intake manifold to the brake vacuum booster on the firewall - it wasn't bad once the air-box is off.

One thing i had never seen mentioned is that i found an air leak where the vacuum tree goes into the intake manifold- I'm not sure if there is a replaceable o-ring but i used some permatex red - oxygen sensor safe sealant and let it dry overnight before starting.

I imagine that you know of using a can of carb cleaner with a straw to direct cleaner to specific areas to detect vacuum leaks, spray a small amount directed in the area of intake junctions and hoses (engine running) while listening for your idle to vary either rising or dropping from your idle speed.

Good luck
bob

andy86+volvo · Post by **andy86+volvo** » 29 May 2011, 20:21

Good idea about replacing those vac hoses. I would suggest that as well if the starting fluid test is effective at detecting a leak. I replaced the fuel injector seals and the vacuum elbows while I had it apart to do the PCV. The kit from IPD came with a seal for the vacuum tree Dipstick seal and fuel pressure regulator seal. So I took the time to do it right while I had it apart (or so I thought). Since I'm gonna have to do it again but at least I know what to expect this time. Hoping to do it in about 3 hours if I have no hangups this time.

da7 · Post by **da7** » 30 May 2011, 10:21

hi andy86+volvo: just wondering, the pictures that you posted, is it from an N/A 850? As I have an N/A S70 and I don't seem to have as much connected to the vacuum tree as shown in your picture?

andy86+volvo · Post by **andy86+volvo** » 30 May 2011, 10:31

Yes it's n/a. But I recall seing some pics of the tree you have and they are quite different. I have never personally seen one though.

da7 · Post by **da7** » 30 May 2011, 11:08

yeah... for some reason mine only got 1 of the 5 small nipples connected whereas yours have 3 out of the 5, would you be able to tell me what is the 3 connections connects to on your car? I know one connects to the air box, that's the only one that's connected on mine, and is the rear one in the back...

so i need to know,
1) the top one in the rear that routes under the fuel rail, where does that go?
2) and the middle one in the front, that disappears into the plastic sleeve...

if you could find out, then that would help me a lot, thanks in advance...

andy86+volvo · Post by **andy86+volvo** » 30 May 2011, 12:04

Here is a pic of the one on the fuel rail starting on the right of the rail and ending on the left at the fuel pressure regulator.

The one in the plastic sleeve goes to the front of the car onto a little valve not exactly sure what it is sorry but its right on top of the radiator under the plastic guard where all the relays are.It's the one on the bottom of that valve.