I keep reading about this 'problem'... We all abviously have this noise on cold mornings... I just got my 850, and had a couple of 244's in the past. I think this noise has something to do with a cold start mechanism, or some sort of fuel pressure mechanism, which only comes on at certain low temps. I don't think it is a problem.

Have u ck the blow out valve for the turbo? The thing is probably hissing cuz the cold air temperature.

good luck.

i have the same thing on my 94 hp turbo. after a minute of so of running, it seems to go away at idle, but as soon as i hut anywhere from 1500-3000 rpms, if apears loud and heavy. recently, i have been letting my car heat up in the morning for 5-10 minutes so i know it is ready to run and so that i wil not damage anything. that and the noise is gone.
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94 854 turbo. (193 hp, 230.1 ft/lbs) numbers are higher, but till i go back to the dyno, i am unsure.

Dave,
I have a 97 GLT 854. I have both "Moaning", as well as, air pump issues. The moan is, from what I have gathered, The belt drive in the "belt box". try pressing down on the top of the box after the car is warmed up to replicate the sound. I have not taken in the car to fix it.... My 850 still does well over 130 MPH as a low pressure turbo so I doubt it is such a major issue. The air pump is another problem. It has caused my O2 sensor to go off and sent the "check engine " light to come on for months now. I will wait to see what will happen when the summer months come about. As far as I can see, it is just an annoyance. If you have the $$ spend it to change serpentine belts... 99% sure that is the cause of the groan.. On my car it sounds liake a haunting moan in the morning.... Kind of creepy.. I dig it fully!!!!!! I would rather it not ve there but you know......................

Dave - You have perfectly described the problem I have had, on & off, for two years. I have the lt pressure turbo 2.4L in my '98 V70 AWD. As much as I love to drive this car, I have to say it has been quite a lemon. The only thing that has kept me hanging on to it, is that the extended warranty has covered most of the $8,000 (US) in repairs. The dealership has been slow, but thorough, in dealing with the various problems and has almost always provided me with a loaner. In an effort to eliminate various noises they have replaced the following: wheel bearing, rear driveshaft, viscous coupling, fuel pump and the air pump. I originally thought the air pump was the reason for this noise, but it was not. Since it was part of emissions it was not covered under the warranty and I had to pay approx. $400 for the part alone. When it comes to repairs on emissions components my recommendation is to try everything else first. Unless you are hell-bent on spewing out (cleaner?) fumes the air pump is the last thing I would do. The three times that I have mentioned this noise to them they were not able to duplicate it. Like yours, it seems to occur only during initial start-up, so I've left it overnight for them to check it first thing in the morning. While it seems to occur mostly in colder temps I have heard it occasionally in temps around 40-50 degrees F. I live in northern Illinois so I have heard it quite a bit over two years but then it can just as mysteriously disappear for a while. If anyone can shed some light on this one it will be greatly appreciated. Good luck Dave and be sure to let us know if you find a cure.

hopsluvr@hotmail.com

I think that what you hear is the air pump. I'm on shaky ground here but I think it pumps air into the exhaust to help burn up the rich mixture that exists while the engine is cold.

Does it ever happen when the engine is warm? How long does it take your car to start up? If you have a cold air intake then it will probably take longer to warm up which may be why the air pump is running so long.

I have an '97 850R and I hear the same thing for a minute or so on really cold mornings, but my engine warms up in just a couple of minutes.

IF it starts to sound really loud then it may be time to replace it.

Dave,

I'm new to the board. I've been looking at a 95 turbo wagon and when I first started it, it did a similar thing. I would describe it as a loud whistle. It's much different than a whistle from a turbo. It's much louder and distinctive. Also, it would only do it when running slightly faster than idle speed. At idle it would dissapear. I talked to a friend of mine with a 96 volvo turbo wagon, and he described the exact same thing. He said it seems to start when temps drop below 20 degrees F. I only support I can offer as that you're not alone.

Mark