94 850 non turbo Please help identify this part!

dconklin · Post by **dconklin** » 13 May 2015, 15:01

Ok, we have been having smoke coming out of the hood for a while now but it isn't overheating. It isn't a ton of smoke either and we realized that it was coming from the circled part on this image. There are 2 hoses that are not connected to anything but not sure if one of them go to this part or if we are missing a part to this.

The smoke is coming out of the little tube there on this part and there is air just blowing it out. I have been searching and searching online but cannot figure out what this part is. Please somebody help identify it! It is located almost directly under the throttle cable.

Thanks in advance!

I hope the photo comes up, it was from my computer but I put it on Google+ to get a url

Post by **JDS60R** » 13 May 2015, 15:57

PCV nipple from oil trap

part 11

Post by **misha** » 13 May 2015, 16:02

Flame trap.There is white plastic disc with holes in that housing.Check if it's clogged and clean it or remove it completelly if it is.
It should be checked and cleaned every 2nd oil change.After you remove it....there is nothing to be clogged ever again.That's all what it do....clogging itself.
Hoses MUST be connected properly.

dconklin · Post by **dconklin** » 13 May 2015, 19:53

misha wrote:Flame trap.There is white plastic disc with holes in that housing.Check if it's clogged and clean it or remove it completelly if it is.
It should be checked and cleaned every 2nd oil change.After you remove it....there is nothing to be clogged ever again.That's all what it do....clogging itself.
Hoses MUST be connected properly.

Thank you!! We were about to go crazy trying to figure out what it was. We have two hoses that are not connected to anything, what part should it be connected to? I cannot tell where one hose originally starts, I lose it along the way. The other is up by the intake. Anyway, if I take this out and throw it away, what do I do with any hoses or connections there? Is there anything that needs to be sealed off upon removal or do you just take it out and done?

Post by **erikv11** » 13 May 2015, 20:15

The flame trap is a small disk inside the housing there, it is the piece you throw away: open up the housing, remove the disk and toss it, close the housing back up. Then, reconnect the vacuum lines to the nipple.

Check this out for vacuum lines, including the one to that nipple: https://www.matthewsvolvosite.com/forums ... =1&t=65002

It is important to get the vacuum lines sorted out, otherwise the car will run poorly.

dconklin · Post by **dconklin** » 14 May 2015, 14:57

erikv11 wrote:The flame trap is a small disk inside the housing there, it is the piece you throw away: open up the housing, remove the disk and toss it, close the housing back up. Then, reconnect the vacuum lines to the nipple.

Check this out for vacuum lines, including the one to that nipple: https://www.matthewsvolvosite.com/forums ... =1&t=65002

It is important to get the vacuum lines sorted out, otherwise the car will run poorly.

Thank you, it was very gunked up! But I didn't know about this flame trap or it would have been dealt with earlier. This is where is gets funny (well or shall I say frustrating and odd.) The nipple hasn't had a hose on it for I have no idea how long maybe even months. We would see smoke sometimes from the hood on and off for a couple months but didn't see any problems when we opened the hood.

I went to try and recharge the A/C a couple days ago and noticed that there was some smoke coming out of that nipple. There was no hose on it. How it is in the picture above is how I found it and we have been driving it for a while. We are 3rd owner and bought it 15 months ago.

Now it is still smoking a bit out of the nipple after cleaning the flame trap, but we only ran it at idle for a couple minutes (no driving after cleaning.) We have 2 hoses that are not connected and I will explain in the pictures below as I am not sure which one goes where - the diagram of the hoses is not really what mine looks like under the hood!! My flame trap is very easy to get to and looks like a different location then others (weird I know.)

I took pictures of under the hood when we bought the car and went back today to verify that the one hose coming off the vacuum tree has never been connected to anything since we had the car. I found it in a location that looks like somebody purposely disconnected it.

Here are the two hoses that are not connected (and haven't been for I am not sure how long)

As you can see in this picture, hose 1 goes to the vacuum tree and this has been disconnected since we bought the car last year (looked at the under the hood photos and it wasn't connected.)

Now hose 2 looks like it was at one point connected to the nipple in my pictures from first purchasing, but I am not definite as I didn't get into that section well in the previous pictures. But this part here is where the other end of hose 2 is connected. It is plugged into the bottom of this which is located next to the air filter box.

Now, does it take a little time for the smoke or pressure to go away after cleaning out the trap (removing it I should say) or is there still an issue? Also which of these hoses belong to the nipple?

Everybody has been a big help so far, thank you everybody

Post by **misha** » 14 May 2015, 15:14

On the flame trap housing there are two ports.A little one(vacuum line) and bigger hose port.Vacuum line goes to left side of intake manifold.There is a nipple in power steering and alternator area on left side of intake manifold where that line needs to be attached.Since it's '94 there is possibillity that you don't have that nipple at manifold.In that case,vacuum line is connecting to a vacuum tree.

Bigger hose is connecting to coresponding plastic line which is just behind intake manifold.That line is covered with a spongy shield.Take a closer look in flame trap area behind intake manifold,it must be there.When you find it,connect it to a larger port on flame trap housing.You will need L shaped piece of hose if there is no hose on either side.

Post by **erikv11** » 14 May 2015, 15:17

Look for a vacuum hose diagram on the hood of your car, it will explain all of this.

The hose from the nipple on the flame trap housing is called "hose 3" in that link I posted. From the nipple it either goes to (a) the small metal nipple on the passenger side end of the intake manifold or (b) if your car does not have the metal nipple on the intake manifold then directly to the vacuum tree. Most likely, your car has no metal nipple, and hose 1 goes to the presently-open-plastic-nipple. But check the passenger side of the intake, make sure there is no nipple for a hose like this:

There will always be smoke coming out of that nipple, even when the flame trap is clean/removed. That is why a hose routes from the nipple to the intake, is it part of the PCV system to recirculate combustion gases.

The one you call "hose 2" I am not sure, that may be the EGR solenoid? In which case it connects to the EGR valve under the throttle body. Do you know if the car has EGR? Does it have one of these down under the throttle body, and if so does it have a hose on the nipple?

There should be no open nipples or hoses when the vac lines are set up properly.

dconklin · Post by **dconklin** » 14 May 2015, 19:28

misha wrote:On the flame trap housing there are two ports.A little one(vacuum line) and bigger hose port.Vacuum line goes to left side of intake manifold.There is a nipple in power steering and alternator area on left side of intake manifold where that line needs to be attached.Since it's '94 there is possibillity that you don't have that nipple at manifold.In that case,vacuum line is connecting to a vacuum tree.

Explains why under my hood looks very different from the diagram! It must be the one off of the vacuum tree. I have no hose 3 on the car and couldn't see a spot for it. But then again the diagram shows the vacuum tree connecting to places that I don't have too. I thought maybe I was going crazy when I couldn't make sense and find the hoses!

I wonder how the car ran so well without that smaller hose connected since it wasn't connected when we bought it! I think they had the wrong hose tho, I think they had that other one connected (hose 2 in my picture.) Wow it is hard to be the 3rd owner of a Volvo, huh?

Now I will have to plug the hose in tomorrow, but I did notice earlier after throwing the flame trap away that I still had smoke coming out of the nipple (It probably would have been the dipstick had I had the hose hooked up correctly.) Is there still a problem or should I drive it a little bit? It has run beautifully just smoked up until earlier today. Just before we did the flame trap we had no choice but to drive it on the highway (thought it would be fine since we had been driving it this way for a while without knowing) and all of a sudden the whole top of the engine was soaked in oil when we got home - this was before the trap was removed. We hadn't been leaking oil like this until today. But yes there was caked gunk and we threw away the trap.

Also I do have the EGR but it appeared to be hooked up properly. Will have to look better in the morning tho.

dconklin · Post by **dconklin** » 14 May 2015, 19:48

erikv11 wrote:Look for a vacuum hose diagram on the hood of your car, it will explain all of this.

The hose from the nipple on the flame trap housing is called "hose 3" in that link I posted. From the nipple it either goes to (a) the small metal nipple on the passenger side end of the intake manifold or (b) if your car does not have the metal nipple on the intake manifold then directly to the vacuum tree. Most likely, your car has no metal nipple, and hose 1 goes to the presently-open-plastic-nipple. But check the passenger side of the intake, make sure there is no nipple for a hose like this:

There will always be smoke coming out of that nipple, even when the flame trap is clean/removed. That is why a hose routes from the nipple to the intake, is it part of the PCV system to recirculate combustion gases.

The one you call "hose 2" I am not sure, that may be the EGR solenoid? In which case it connects to the EGR valve under the throttle body. Do you know if the car has EGR? Does it have one of these down under the throttle body, and if so does it have a hose on the nipple?

There should be no open nipples or hoses when the vac lines are set up properly.

You did a wonderful job with the pictures of the vacuum hoses, I just really wish that mine looked just like it. It is amazing how much different mine is really! I do have an EGR valve but I believe that everything was all together on it, will have to double check in the morning.

It has to be the one off the tree, I didn't see any on the other side of the intake. I wonder why the previous owner removed the hose from the trap (that's the one that you can tell was purposely removed by how it was placed!) Amazing it ran ok.

I am hoping to have all hoses in the correct places, just funny I was driving with 2 disconnected and had no idea!