X5M whistle at acceleration and loss of boost

[igell]

Recently started getting some whistle at acceleration and sometime it seems like the boost actually dies.. (i hit the gas from a stop and the truck slows down for a sec or two before taking off again)
I assume i have a boost leak as crack in some of the plastic hoses under the hood. where should i start looking?

2011x5m

[Colodano]

Sounds like you already know the answer, if there are cracked hoses, replace them...

If you cannot readily identify the leak at that point, take it to someone who can smoke test it.

[igell]

Originally Posted by Colodano

Sounds like you already know the answer, if there are cracked hoses, replace them...

If you cannot readily identify the leak at that point, take it to someone who can smoke test it.

is there a simple way to replace these plastic hoses with silicone ones that dont crack as easily? I saw the catchcan wright up but i am not quiet sure i am ready to go that route yet.

[Thecastle]

Not that I'm aware of, there is no aftermarket solution or custom solution to replace the cracked ccv lines. Except with oem.

[Colodano]

There are so many hoses, it really depends. The big hard plastic tube from the turbos to intercoolers, that pretty much has to be stock, but the hoses into and out of it can be replaced with silicone.
The CCV lines either go with new stock, or do a custom catch can setup, if you do some digging on here you will find examples.
There is a good writeup on replacing the fresh air vents and ccv lines that also covers the turbo inlet and outlet stuff well.

[Dawgz]

Could also be the diverter valves not holding the pressure.

[igell]

the guy did a smoke test and said that there was smoke coming from the turbo inlet piping right at the turbo. Is there a seal that i can replace or do i need to replace the whole pipe?

It looks like its just clamps there.. so i should be able to just use different clamps... what size does it use?

[ncmoore12]

Originally Posted by igell

the guy did a smoke test and said that there was smoke coming from the turbo inlet piping right at the turbo. Is there a seal that i can replace or do i need to replace the whole pipe?

Where did you get this done at and how much did it run you? also in the bay Area. I already replaced my back CCV lines the easier ones.

[igell]

Originally Posted by ncmoore12

Where did you get this done at and how much did it run you? also in the bay Area. I already replaced my back CCV lines the easier ones.

I actually have not yet gotten it done.. they guy quoted me 200 for labor which seems high just to replace some clamps. i am going to see if i can do it myself.
It was 100 for diagnostics and smoke test.

[TwinSnailz]

Originally Posted by igell

the guy did a smoke test and said that there was smoke coming from the turbo inlet piping right at the turbo. Is there a seal that i can replace or do i need to replace the whole pipe?

It looks like its just clamps there.. so i should be able to just use different clamps... what size does it use?

Inlet pipe had the pcv valve connected to it. The pcv on the right side (passenger side) is just a flap that allows air from the crankcase to recirculated back to the turbo intake. A smoke test on this side is invalid as it is intended what it’s design to do.
Just my personal test that i have done on my M because of the whistle noise.

[Colodano]

Where the fresh air vents go into the turbos there is a seal that gets hard, I have had to replace mine twice in under 3 years of ownership. But that seal shouldn't cause low boost, just a possible vacuum code.

It does take some time to get in there, so a mechanic charging under 2 hours to do it is entirely reasonable.

That said, I would keep looking for a whistling under boost, I doubt that will be the real issue.