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  #1  
Old 04-15-2024, 01:50 PM
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Plz Help me identify this unattached hose next to the Oil Stick and Disa Valve

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.
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  #2  
Old 04-15-2024, 02:09 PM
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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.
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  #3  
Old 04-15-2024, 02:51 PM
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Quote:
Originally Posted by Clavurion View Post
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?
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Old 04-15-2024, 02:52 PM
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Quote:
Originally Posted by Clavurion View Post
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.
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Old 04-15-2024, 03:00 PM
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Quote:
Originally Posted by shevin View Post
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.
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  #6  
Old 04-15-2024, 03:06 PM
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Quote:
Originally Posted by Clavurion View Post
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?
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Old 04-15-2024, 03:23 PM
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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?
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Old 04-15-2024, 03:37 PM
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Quote:
Originally Posted by X5chemist View Post
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 )
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Old 04-15-2024, 05:10 PM
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Quote:
Originally Posted by X5chemist View Post
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?
@X5chemist UPDATE !!!!

I unplugged the MAF sensor and drove it and the Rough idle gone !!! and also I no longer get the System too lean Codes anymore !!!

does that mean everything else is Good and I only need to fix the MAF sensor ?

I also opened the MAF sensor to clean with the CRC spray and I noticed parts of it is Orange, is that normal color or is that rust?

https://imgur.com/a/89QY7ml
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  #10  
Old 04-15-2024, 05:35 PM
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Wow! How old were those spark plugs? The ceramic burn through was really bad. Those are some of worst I've seen.

What is the MAF reading when it's plugged in? Reading in grams/sec. It should be close to engine size at operating temperature. The sensor could be bad. Is it an OEM old one? If it's very old, replace it or borrow one to try out. The orange glue looks like sensor "coating". I have not look at one closely but it should be normal unless it looks burned.

When everything is working properly, front O2 sensor voltages should cycle up and down. The rear O2 sensor should read steady voltage. The rear voltage will change with idle RPMs but stay mostly flat at constant RPM. If rear O2 voltages mimics front O2 cycling, there's a problem.
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