Loss of acceleration on 2005 xc90 2.5T

[diclemeg]

Hi folks.
So I have a 2005 xc90 2.5T with 120K. PCV system, timing belt, TCV, plugs, oil seals changed at 90K. Before then I had the oil seal failure and ended up running engine 8 miles under this problem, maybe I caused blowby.

Currently, on startup, engine whistles loudly, rpm goes to 1500, then slightly inches to maybe 1575-1600, then back to 1500, then settles to 1000, then to 750ish. Not sure if I have a vaccuum leak.... though have no codes to speak of. While cold acceleration it whistles a bit upon acceleration, but goes away once engine reaches operating temp.

Now, accelerating it seems from 3rd gear and up, is a problem, its a dog now, cannot pass cars on freeway so easily, and a dog on an incline. If I punch it I can feel the turbo spool and kick in but then hesitate, like its being blocked.

Someone told me the catalytic converter is clogged and had it checked so its not that. MAF sensor is clean.

Any suggestions on how to find this power issue would be appreciated.

[ggleavitt]

The big hoses from air filter through intercooler to the throttle body are all nice and tight with no cracks or leaks?

[SuperHerman]

First question is did the problem start immediately after any work you had performed or was it running fine and then started?

The turbo whine - is this new? My gut is you have an air leak somewhere. You have to go through the plastics, as mentioned, and also check the hoses that go to the turbo and the turbo solenoid. With age some of these crumble and fail and will cause what you describe. If you have a vacuum tester you can run through the lines - and if you have a smoke machine you can use that to look for leaks.

First place to look is air leaks - after that the search can be expanded.

[cn90]

I'd start with cleaning the throttle body.
I wrote a DIY in this forum w/o the need to remove the Intake Manifold...