My 2004 xc90 drives great until I want to accelarate, it makes a horrible sound. I have found that the turbo intake pipe is collapsing, any one know the solution ?

Think you'll struggle to get a part number for the actual full rack but there are service kits available for them mate
Service kits steering box Fits 2004 Volvo XC90 2 9l 6 cylinder Turbo T6...

Check the seals on the intercooler, for oil to get in the pipes means that the seals are damaged and its loosing compression

It means that the oxygen sensor is bad, it is the first sensor you see on the exhaust pipe before or in the catalytic converter.

This is the turbo air cooler hose and most of them have some oil in them from the turbo. i would replace the hose and keep an eye on it, the problem may be a worn turbo. the turbo is sucking in oil, the turbo may need replacing but i would nt replace it right now, just replace the hose and keep an eye on the engine oil level, if the turbo is working and the engine is not using oil and you dont see smoke coming from the exhaust system when accelerating then just replace the hose for now, hope this helps.

i hope you are using nothing but SYNTHETIC oil.The turbo is intercooled by oil.If the turbo is gone,it will **** oil into the intake system and burn it.

I am assuming yours is a Turbo? because it sounds like an air pipe has blown off, have a poke arround under the hood, try and locate the turbo (I know it is tight under there) and follow the pipe to the intercooler, make sure the worm drive clips are on and tight, then follow the pipe (about 3 inch diameter) to the inlet, make sure the pipes and intercooler are intact. Did anything happen just before this problem? any work done or anything run over>

I wouldn't drive it until you get a scan done to determine what the problem. Diesels are very expensive to fix. I would lean towards the cam shaft sensor has failed but don't quote me on that.

not really any special tools vill be required.  You will need access to the underside of the car.  And the parts are really expensive.

By the cover I am going to assume that you already have removed the turbo tubing on top of the engine. If not use a 7 or 8 mm. socket to loosen all the hose clamps. then remove the inner smaller pipe that connects to the two middle silver turbo tubes. then remove the T25 torx bit that holds this tube to the larger one under it. Lastly remove the large black hose at that connects to the tube, it may be necessary to remove the two 10mm bolts for the fresh air intake tube. Now all the connections should be off the tube. With moderate force pull the pipe toward the front of the car wiggle it back and forth until it releases.

Next you will need to remove the clamps for the larger tube that runs to the outside piping down the back of the engine. Then remove the two T25 torx screws that hold the pipe to the intake manifold. You can leave the large hose that connects to the air box in place and just prop up the tubing using bungee cords or the like to hold it up and out of the way. Using the same movements pull the large tube forward and wiggle it back and forth until it releases from the silver pipes going down the back of the engine.

I hope all of that makes sense, it's a lot easier than it sounds.

Now with all of the piping out of the way you should see a plug cover that says VOLVO. It is held in place by 7ish T30 torx screws. The cover should just lift up.

Very important....

Starting at the front of the engine (the timing belt side) use a marker to number the black ignition coils from 1-6. Next make a mental picture of the routing of the wiring. It must follow the same routing or it could get pinched by the screws for the cover when reassembled.

Now, remove the 10mm bolt from each coil and pull off the coil while rotating back and forth to try to keep the coil boots from tearing. With the coils out remove the six spark plugs and discard.
I strongly recommend VOLVO spark plugs are used, I've seen allot of problems from aftermarket plugs. before installing the new plugs apply anti seize to the threads of the spark plugs. reinstall and tighten the spark plugs until their tight, they need to be tight, but don't go crazy. Reinstall the coils and bolts.

Make sure the wiring is sitting down in the valley and is not riding on the ridge or it will get pinched and you'll have to pull it all back apart. Reassemble all the pieces in reverse order, just make sure that when you reinstall the turbo piping that they fully seat on the silver pipes on the back of the engine. Usually just push and wiggle them back on.

Now there are two to three vacuum lines on the large turbo tube that go to the air box. Make sure they get plugged back in if they have come loose, most of the time they are fine, but sometimes they fall off.

Well, good luck. Just take your time and be thorough, it's not that hard it's just a little time consuming.

Hope this helps.

Could just be a soft / collapsed hose but check the air filter and intake for blockage or just a really dirty air filter. It the engine struggles to draw air it will collapse hoses.
Cheers
John