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Vacuum hoses and rubber elbows 850 1994

Hi

One of the things recommended to readers of this forum to remedy poor engine performance is to check the rubber elbows on all vacuum lines. One in particular seems to cause trouble, it is reputedly located on the left side of the engine, near the steering pump, and connecteds to the manifold. It is said to be hard to see, and most people don't even know it's there.

Certainly is hard to see ! I don't think my 94 850 turbo even has one. Where is it supposed to go and what was its function?


KP








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Vacuum hoses and rubber elbows 850 1994

Your not crazy... my '94 850 turbo doesn't have it there either... period.

Some kind of variant engine vacuum design...

I'd love to here experienced techs weigh in on this one as to why this is...

Shawn








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OK - it doesn't exist ! 850 1994

Hi Shawn

OK and thanks for that. And also to the other respondents for their input.

To recap - this lione should be in the same position as the throttle body but at the other end of the manifold? There is a circular depression in this position maybe 2 inches in diameter, the elbow presumably went to a hole in the centre. On my 94 turbo there is nothing there - no hole even.

I can discount this as a possibility for poor fuel consumption (uner 15 mpg - city).

Back to headscratching.....

Keith








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Maybe its built into the manifold now ? 850 1994

My 1995 850 2.5 20v non turbo also doesn't have it.
I was thinking that maybe its inside the manifold on the later models?








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Vacuum hoses and rubber elbows 850 1994

not an experienced tech, but I know that the 94 also has another odd vacuum hose that not all others have (can't say which ones don't).

There is a line that goes under the spark plug cover and routes around the perimeter of the cover. This supposedly "heats" the line?

Still haven't figured out what this line is for...

Only know that I replaced the rubber elbow under the torque mount, it was cracked.

Bay 13 shows it at the bottom of the vacuum line page.

Anyone know what it is and why it needs to be heated?

-Jason
--
94 855 Turbo, Aretha








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Vacuum hoses and rubber elbows 850 1994

it is just behind the thermostat location and under the radiator hose. you will have to lift up the hose. a flashlight will help....a lot. if you think it is hard to find....try changing it !!!








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Vacuum hoses and rubber elbows 850 1994

I must be mad. I have a picture of the thing from ebay - seems I can see all the boltheads in there which correspond to those on my steering pump, so I know I am looking at the right place, but still cannot see one. Where did the other end go - to the wacuum tower under the throttle body cover? Nowt there I can't see already going elsewhere.


Hmmm. I'm confused.


Keith.








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Vacuum hoses and rubber elbows 850 1994

it goes (attaches) into the intake manifold, the tube goes to the back of the engine somewhere. there is a picture of it at bay13 under vacuum lines. the black box to the left is the power steering reservoir. if you still dont see it, try to feel the hole in that area. you might have lost yours already. 1st look and i saw mine, then again i have a 96. not sure if a 94 has one. run a finger on that spot and see if you feel a hole.








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Vacuum hoses and rubber elbows 850 1994

I had to replace these elbows on both ends of this hose on my 95 850 turbo. If yours is a turbo, it has this hose. This hose runs from the passenger side of the air intake manifold, around behind the intake manifold, over the tranny, and into the main air intake hose into the turbo. Both elbows will get soft and deteriorated over time, apparently due to oil in the air. Here is what worked for me:

It took a flashlight to see the elbow. Once I saw it I saw that it was completely blown out. This elbow is held on with a small clip that can be clamped open with pliers. I used a very long pair of 90 degree bent nose pliers to compress the clip and slide it back off the port. Next I pulled the elbow, with the pliers, off the hose, or as much of it as would pull off.

Then unhook the other end from the turbo intake hose.

When you do this, forget about the vacuum hose! To remove/replace it would mean you would have to remove the intake manifold itself to get to it, as it is clamped down to the block of the engine behind the manifold.

Go to your local Volvo dealer and order the two elbows (they are not identical), then go buy a vacuum hose at a parts house (or several hoses and connectors if you cannot find one hose long enough as it will need to be long) and reroute the vacuum hose from the side of the intake manifold, around the front of the intake manifold, under the idle air control valve, over the tranny, and into the spot where the old elbow plugged into, attaching the elbows to each end of the new hose with connectors.

Voila, your air leak is magically fixed. Now reflect on a job well done and realize that life is good. :)

kevin








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Vacuum hoses and rubber elbows 850 1992

On some models (1992 included) the hose from the throttle body
runs to a carbon canister beneath the intake manifold. I guess
the only way to get there is to remove the manifold. Anyone
with this experience, please post some details about that!
I couldn't locate one of the nuts. Has anything else to be
removed to get to the nuts?

Regards,
Dmitri







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