850r failing emissions miserably (HC and CO) Topic is solved

[JayPea44]

I am in Sloans lake area, Edgewater area.

I've been trying to find a good diagram to check all the vacuum lines.

[scot850]

Did you check under the hood? Volvo used to have a sticker on the hood with the vacuum layout.

There are thumbnail pictures that you can expand on this thread from Volvo Forums website:

https://volvoforums.com/forum/volvo-850 ... ion-68636/

Neil.

[JayPea44]

Did you check under the hood? Volvo used to have a sticker on the hood with the vacuum layout.

There are thumbnail pictures that you can expand on this thread from Volvo Forums website:

https://volvoforums.com/forum/volvo-850 ... ion-68636/

Neil.

It is there, but a little small and torn up, thanks for the link!

[Clemens]

One more thing: if you are not getting full boost, you might have a badly worn turbo, split intercooler hoses (check carefully, they might look okay if not boosting) or a shot intercooler.
Usually it's the hoses, but I had a badly worn turbo in my 94 and you could smell the overly rich exhaust gases when stomping on the loud pedal.

[JayPea44]

One more thing: if you are not getting full boost, you might have a badly worn turbo, split intercooler hoses (check carefully, they might look okay if not boosting) or a shot intercooler.
Usually it's the hoses, but I had a badly worn turbo in my 94 and you could smell the overly rich exhaust gases when stomping on the loud pedal.

Thanks I'll check them out. I'm not too concerned right now unless it's causing or contributing to these issues. This old thing is a project so the turbo and associated system si going to get overhauled in the long run either way.

[matthew1]

Did you check under the hood? Volvo used to have a sticker on the hood with the vacuum layout.

There are thumbnail pictures that you can expand on this thread from Volvo Forums website:

https://volvoforums.com/forum/volvo-850 ... ion-68636/

Neil.

They actually pulled the red/yellow/green/blue line one from MVS... I made (color coded) that probably 17 years ago

viewtopic.php?t=6941

vacuum-hose-diagram-850.jpg (92.28 KiB) Viewed 915 times

vacuum-lines.jpg (132.15 KiB) Viewed 915 times

[JayPea44]

Perfect - I'll get out there tomorrow and go over these lines. Engine bay is a bit messy so I'm betting there's something lurking in there.

[WhatAmIDoing]

One more thing: if you are not getting full boost, you might have a badly worn turbo, split intercooler hoses (check carefully, they might look okay if not boosting) or a shot intercooler.
Usually it's the hoses, but I had a badly worn turbo in my 94 and you could smell the overly rich exhaust gases when stomping on the loud pedal.

Just to add, If you don't know when your TCV was replaced, they are known to fail and cause erratic turbo behavior. Or any of those vacuum lines being split will reduce boost.

[abscate]

Note that red in Matt’s diagram doesn’t match the red on the Volvo diagram. Mark them with tape on your car before you pull them off

[BlackBart]

They actually pulled the red/yellow/green/blue line one from MVS... I made (color coded) that probably 17 years ago

You made that?! Funny, I used that, I have it printed in color in some folder somewhere! I even used colored hoses! (Makes it so much easier to see where you’re going)

JayPea - I also followed advice to tape and mark hoses first. It’s dark and hard to see and covered with grime back there.

I had some funny stumbling long ago, did a tuneup, thought I’d just look over the vac hoses....and they were dry, cracked, splitting. Ran perfectly with new hoses.

We had a cracked intercooler case once, and it stumbled and coughed and spewed black smoke and got single digit mileage while we limped it home. (We hit a big bag of onions in the dark that had fallen off a semi - no sh!t.)