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> Turbo Problems
mjm421
post Oct 26 2008, 02:11 PM
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Hey guys, im hopin someone might be able to shed some light on a problem im having with my car. Also this is my first post on these forums :).

to start, I have a 95 850 turbo. Today traveling on a rural road i got stuck behind a VERY slow driver, and when i had the chance, i got into a passing lane and floored it. Turbo kicked in, as it has always done, and for about a second i had great boost, then all the sudden i lost all boost. I immediately let off the gas petal, and then gave it gas again. No boost. No matter how much gas i gave it, the boost gauge would only show that the turbo was giving maybe a pound of boost ( the needle would barely go over the line that lets someone know the turbo is providing boost ). So, my question is... could the waste gate have failed, and should i start by getting a new one, or is my turbo blown maybe? Any ideas and advice would be greatly welcome.

Thanks in advance.

Matt
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swedseed850
post Oct 26 2008, 02:45 PM
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did you still continue to feel the power? Is the 850 accelerating normaly? the line for the boost gauge may have split, thats the easy start. Check your turbo inlet and out pipes for wear, or disconnection, also, remove the gas cable cover, inspect the vac tree, no missing connections there?
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mjm421
post Oct 26 2008, 02:50 PM
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As far as feeling the power that the turbo provides when it spins up, no. Acceleration is no where near where it should be when i accelerate. As far as how the engine sounds and stuff, everything sounds fine, except for the turbo not sounding the way it does. You can hear it, but its alot more subdued, even when i have the pedal floored.

Ill try to check the things you listed above. i must admit though when it comes to checking things on a turbo im not to good at that, as this is my first turbo equipped car.

Im gonna be pretty sad if i come to find out my turbo is busted. i absolutely LOVE that car. The day i started driving it, it is probably safe to say that i became a Volvo enthusiast. :)
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swedseed850
post Oct 26 2008, 02:55 PM
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lets hope the turbo bearing didnt fail. swap of a working unit is easy tho. Take the heat shield off the back of the motor, revealing the turbo, BEFORE you run the car, HEAT! Do you have a service manual, say, Hanes (not always correct but damn close).
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mjm421
post Oct 26 2008, 03:02 PM
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I dont have one, no. But it would be easy to get one. So replacing the turbo is relatively easy eh? I usually do all my own work to my car, and consider myself mechanically inclined. So if that is the case then that is music to my ears. But lets hope i dont have to go that far.
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Sparky4688
post Oct 26 2008, 03:18 PM
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This is in the for what it's worth category. Recommend you check all your vacuum lines not just the 3 on the Turbo. I just replaced all 10 vacuum lines and vacuum tree. Leaks, cracked plastic lines, and rubber elbow fittings everywhere including the brake vacuum boost.

I have the vacuum diagram and just posted to confirm 2 connections. Turbo bypass valve usually listed as "white" to intake manifold. AND PTC on air intake pipe near turbo to engine vacuum above distributor cap.

Once I confirm these last 2 lines I will post all 10 with pictures.

My car has 170K miles and now runs like brand new!

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Sparky4688
post Oct 26 2008, 03:28 PM
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Meant to add this to my last post:

Volvo engine service manual for engines B5204, B5234(mine), B5252, B5254 850 1992 and beyond says on page 112 TC troubleshooting section to:

Turnoff engine and listen to the TC as the engine stops. Normally the moving parts on the TC will stop a little after the engine. My note: Can't hear TC stop from inside car so have someone else turnoff the car.

If this does not happen: remove the inlet hose from compressor housing.

Check that:

- turbine rotates
- axial and radial play feel normal
- turbine is not scraping the compressor housing

Hope this helps.
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mjm421
post Oct 26 2008, 03:34 PM
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Thanks alot guys, ill post more on this topic later after i check everything out.
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swedseed850
post Oct 26 2008, 03:35 PM
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+1 Sparky4688! :clap: :trophy:
those vac issues can cause problems! Everything on this car runs either vac assisted, or electrical.
and if the turbo has broken, you will see metal shavings in the pipes after turbo. :thumbsup:
but im sure its Vac related
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ampangbear
post Oct 27 2008, 10:16 PM
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QUOTE(Sparky4688 @ Oct 27 2008, 04:28 AM)

Turnoff engine and listen to the TC as the engine stops.  Normally the moving parts on the TC will stop a little after the engine.  My note:  Can't hear TC stop from inside car so have someone else turnoff the car. 

[right][snapback]94858[/snapback][/right]




I've done that before. Do you realise that the only way you can do this safely and surely is by having the car lifted and your ears real close to the turbo?

After a few tries, i decided my ear (either left or right) is a lot worthy that a dang turbo.
Haha.
And oh, as an alternate, using a mechanic's stetoscope might help, just dont touch the dang turbo.


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mjm421
post Oct 27 2008, 10:24 PM
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If you cant hear the turbo spinning down when the car is shutoff.... im assuming that is bad news?
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swedseed850
post Oct 27 2008, 10:30 PM
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the only way you can do this safely and surely is by having the car lifted and your ears real close to the turbo
per Bear..


are you sure you CAN hear it, mjm421?
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mjm421
post Oct 27 2008, 10:48 PM
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When i floor it, i can barely hear it. when i shut the car off, i cannot. tomorrow i will put the car up on ramps and get closer to it. Would do it now, but its 35 degrees out and nearly 11pm =\ .
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ampangbear
post Oct 28 2008, 01:35 AM
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I assume when they first came out with that instruction, they didnt factor in the kind of environment a usual and common working workshop would be like, i.e. noisy, hot and etcetcetc.

So, like i said, i love my ears MORE than the Turbo, so i abandoned the attempt.

By the way, if you're just going to lift the car using a car-jack, PLEASE BE CAREFUL. I had the car totally lifted with the 5 tonne lifter above my head, and could STILL feel the heat, imagine if you're closer.

Cheers.
:)

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Tech
post Oct 28 2008, 08:21 AM
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Make sure all of the intercooler hoses are good as well.
One might have a hole in it or be collapsing under boost.

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Sparky4688
post Oct 28 2008, 10:39 AM
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I use a rolled up piece of paper around my ear or a cardboard papertowel or wrapping paper tube to hear engine noise. I never stick my hear/ear that close to a running engine. Should be able to hear turbo from top of engine with no car lifting required.

You should hear the turbo spool up and down while driving. I can look at the turbo vacuum needle on the instrument panel and its move will correlate with turbo spool. Should be able to hear and feel turbo while driving.

I cannot empasize enough to check the vacuum lines early in your troubleshooting list.
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mjm421
post Oct 28 2008, 12:41 PM
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The needle moves barely above the line that indicates boost, which is probably why i cant hear it when driving. I will definitely be checking the lines though soon as i get some dang time. haveta leave for work in 30 min :( . even after talking to a Volvo mechanic, he strongly suggested i check all the lines leading into and out of the TC, vac lines, everything. He said it sounded to him like i may have blown a line somewhere. Hopefully it wont be to cold after i get off work to check everything, as i dont have a garage :( .
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Sparky4688
post Oct 28 2008, 03:52 PM
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No garage here either so I feel your pain. I have upped here: http://www.volvo-forums.com/index.php?show...4869#entry94869 of my vacuum lines. May find it helpful.
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ampangbear
post Oct 28 2008, 07:55 PM
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Lets hope the best for him.
:)

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Sparky4688
post Oct 29 2008, 04:03 PM
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Solved my vacuum line issue.
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