Plz Help me identify this unattached hose next to the Oil Stick and Disa Valve

[shevin]

I have been trying to fix my bmw x5 2003 3.0
it has 283000 miles on it with symptoms: Rough Idle/Stalling/Systeam Too Lean Fuel Bank 1&2 and misfire on all cylinders.

While I have been chasing the source of the issue, Today I found out there is an un attached Hose !!! and I would like to ask you guys help me understand, is that supposed to be unattached ? why it is there? Plz plz help me.

and here is a Video of it
https://youtube.com/shorts/y-i8Ye_e0..._zxXwfncUOqyBz

also larger IMG
https://imgur.com/a/N7XRcT4

p.s (unrelated):
- I changed my fuel filter yesterday and it was the ORIGINAL one form 2003, with 280K miles on it, and it was So Clogged and Dense Black Liquid was coming out of it.
- I also changed all spark plugs and Ignition colis and air filter and Oil 2 weeks ago.

[Clavurion]

Air/vacuum leak:
*Intake boots between MAF and throttle valve
*CCV system
*Rubber plugs at the rear end of intake manifold
*DISA valve

That loose hose is front diff ventilation. That's how it should be.

[shevin]

Originally Posted by Clavurion

Air/vacuum leak:
*Intake boots between MAF and throttle valve
*CCV system
*Rubber plugs at the rear end of intake manifold
*DISA valve

thank you, what are these things you mentioned ? are these the sources of possible issue for my Stalling and Rough Idle?

My Fuel filter was REALLY really bad (original since 283 miles) could it be that the injectors are still dirty and if I keep driving it it will get better ? or the System Too Lean means vaccum leak?

[Clavurion]

Originally Posted by shevin

thank you, what are these things you mentioned ? are these the sources of possible issue for my Stalling and Rough Idle?

My Fuel filter was REALLY really bad (original since 283 miles) could it be that the injectors are still dirty and if I keep driving it it will get better ? or the System Too Lean means vaccum leak?

Vacuum leak is the most likely cause to your lean running. The mentioned are the typical causes for M54 vacuum leak.

[shevin]

Originally Posted by Clavurion

Vacuum leak is the most likely cause to your lean running. The mentioned are the typical causes for M54 vacuum leak.

Thank you do you know how much that would cost me to fix in CA by a mechanic (roughly?)

Anyone knows any place in LA that would do it at an affordable price?

[shevin]

Originally Posted by Clavurion

That loose hose is front diff ventilation. That's how it should be.

Thank you for clarifying that ! I am glad thats normal, I was surprised I had never paid attention to it, and usually in youtube videos it doesnt show up either.

[shevin]

Originally Posted by Clavurion

Air/vacuum leak:
*Intake boots between MAF and throttle valve
*CCV system
*Rubber plugs at the rear end of intake manifold
*DISA valve

That loose hose is front diff ventilation. That's how it should be.

UPDATE ! @Clavurion

I ordered a smoke machine and I am waiting on the delivery but guess what, I think I actually found the source of the problem, before the smoke machine arrive in mail.

would you please me what is the part name or number for this Lower Boot? it is cracked right where it connects with the upper boot at the clamp

and is there any Video I can follow to change it myself?






is it possible that I just Patch the boot instead of replacing it? I saw a video that they used super glue and then black siliocone to patch rubber boots.
I am under time pressure to pass the SMOG, would that be a temproary good solution till I order the parts ?

[timmyc]

Originally Posted by shevin

UPDATE ! @Clavurion

I ordered a smoke machine and I am waiting on the delivery but guess what, I think I actually found the source of the problem, before the smoke machine arrive in mail.

would you please me what is the part name or number for this Lower Boot? it is cracked right where it connects with the upper boot at the clamp

and is there any Video I can follow to change it myself?

Here is an invaluable resource for your future repairs:
https://www.realoem.com/bmw/enUS/select

Input your vin number and it will give you pictures and part numbers for essentially every part, including nuts and bolts, for your X.

[X5chemist]

What did the spark plugs look like? What brand are installed? Unplug the MAF sensor. How does it run? What is live data for MAF, O2 voltages for front and rear readings?

[shevin]

Originally Posted by X5chemist

What did the spark plugs look like? What brand are installed? Unplug the MAF sensor. How does it run? What is live data for MAF, O2 voltages for front and rear readings?

Thank you very much for your response,

The spark plugs had oil on them (I overfilled the oil a bit before) here is the picture of them, https://imgur.com/a/2ZL84Xy I changed them with NGK spark plugs.

- If I unplug the MAF sensor is that safe ? do you mean IDLE or should I drive it? is there a page I could see what is the Correct MAF and O2 Voltage Data ? (I I will go get them soon for you)


ps, btw my car does have small oil leak and does occassionally Yell at me at the "STOP engine oil pressure" (but there is enough oil in there, I get 28 Thermal Sensor or OilLevel Defect Error code which I think means oil level sensor is bad )