Just bought a 1999 S80 2.6 last weekend. It's my first car and I bought it relatively impulsively, but I've been looking for one for a long time that isn't a salvage title and it was a great price.
Anyway, I bought it from a private party knowing it needed a little work before it could smog (I'm in California by the way). He said it needs a new oxygen sensor (the check engine light is on). It has had a front-end collision, but the damage is pretty minor (didn't break a headlight, smashed some of the plastic parts, hood doesn't quite sit flush). He actually couldn't get the hood open, but I got it open without too much effort, so whatever. Anyway, this hose (sorry, I don't know what it's called but it goes to the air cleaner) is disconnected, and I can't see how it would fit back on. The part that it would connect to seems almost shifted over at least a couple inches, but the front end is not that out of whack.



That said, is it wishful thinking that this could be the issue and not the oxygen sensor? Even if it's not the only issue, I would still like to see it fixed. I talked to my mom on the phone and she said she had basically the same issue with her 850 and that the guys at the shop just taped it on.

Like I said, this is my first car so I have pretty little experience with cars in general. And while I have your attention, I might as well get through all of the issues.

I've read the brake booster thread and this car has the same hissing sound when you release the brake. Will this cause the car to not pass smog? Is it dangerous to drive?

Also, if the oxygen sensor does need to be replaced, how invasive of a procedure is that? I'd say I have above average mechanical intuition (I'm a mechanical engineering student), but I have very little car experience. I would like to work on the car myself, not just to save money on shop labor, but because I would learn a lot doing it. That said, I don't want to irreversibly damage something obviously.

Are there manuals out there more detailed than the one that comes with the car?

This turned out way longer than I intended. If you read all of that, I appreciate it very much.

 

If it doesn't line up, something has shifted, simple as that. So you need to find out why. My S80 doesn't have the same intake as your car, so I cannot help much further, but in short there is no reason it shouldn't fit back in place except if something shifted.

 

It's no big deal if it can't snap back in. It has no effect on your check engine light. You should have the error codes read first before replacing parts!

 

That pipe should fit onto the airbox and slide on by about two inches, then the front part matches up with a corresponding hole behind the grille. If the pipe is misaliged with the hole and its already stilling correctly it may just be that the airbox isnt sitting where it should. It sits on rubber grommets and can move sometimes.

Any sort of vacuum leak that you can hear a hiss from is going to throw a CEL. Get the codes pulled, post them and we can work from there. Most likely you have a vacuum leak (possibly from brake servo) that is putting the fuel trims out of range. Weather its a safety issue is a matter of opinion, if you have strong leg's you'll be fine.

In terms of documentaiton your options are "acuire" a copy of VADIS and or sign up for on alldatadiy.com

Oh, and the car has 4 O2 sensors, two on each cat.

 

It is simply a cold air duct. Look under the header panel and you'll see where it connects. The outer edges get chewed up from people trying to jamb them in there. Take your time and snap it in place, then connect to air cleaner box. Done.

 

I had problems putting mine back on after I took out the air filter box so I pulled out the opposite end and removed it. The car runs fine without it.

It is the cold air intake. Instead of pulling in cold air from in front of the radiator you will pull in slightly warmer air from rear of the radiator if you remove it.

Make sure you diagnose the problem with the oxygen sensor properly so you do not end up replacing the sensor only to find out it is not the problem.

 

Thanks for all the responses. You guys are awesome.

Regarding the hose question. I haven't tried disconnecting it from the air cleaner, hooking it up in front, then back into the air cleaner. That seems like it could work. I'll give it a shot when I get some time.

As for the other problems, I was planning on getting it diagnosed first. I discovered that places like Kragen or Autozone don't do that any more though. And their base units are much more than I'm willing to pay. I found some OBD units online for ~$30. Are these reliable? The guy at Napa wanted to sell me one for $200.

I think I may just take it to a place and let them do their worst on the whole thing. There's a local place that apparently specializes in Volvo, among other makes. They also have smog test capabilities so it may just be best to go this route. As much as I want to learn about cars (and even more so about my car), I don't really have the time to invest and I need to get it smogged as soon as possible so I can get the title changed over.

 

You will know if it needs an 02. Your engine light will be on and there will be a code. You can get the 02 sensors on line new for about $107. Make sure you go with the direct fit Volvo 02. Or at least I would.

I had the same problem with that plastic piece. I think you will find installing it up top first and to the airbox second may solve your problem.

I have never encountered the brake hissing sound. Where is the sound coming from? Are you sure its brake related? There is a fan in behind the radio that comes on from time to time to cool the electronic components, maybe you are hearing that.

Jim

 

It occurs when I release the brake. I can stop it by just tapping on the pedal. It's basically just as described in the brake booster thread that's stickied in this S80 forum.