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What is that clunk every time the revs drop.

What is the mileage? Does it dissappear completely when warm?

Is it an m52tu? Double vanos.

It may be the vanos seals. Idle instability is one of the symptoms
 
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Rather than ask a 1,000 questions, can I get you to run a few data logs and post links to the logs here. I do a lot of analysis on the logs and can generally find the problem.

You will need:
- An OBD adapter, either WIFI or Bluetooth, depending on your phone type
- The OBD Fusion smart phone app.

Read this thread to get all the information: https://www.e46fanatics.com/threads/obd-fusion.1240733/#post-18380161

Loading the logs into www.DataZap.me and posting the links to the charts here is the best way to share them.

By the way, the surging cold idle you have is generally caused by a vacuum leak somewhere.
 
Run the data logs and we'll do an evidence based diagnostic.
 
Snippet off the net
A noisy Idle Air Control (IAC) valve, often described as a humming, buzzing, or clicking sound, can indicate a problem with the valve's function, potentially leading to issues like fluctuating idle, hard starting, or stalling. :thumbsup:

Had a similar issue with mine hunting like that when I first got it, but I did that, the DISA, and found a vac leak all at the same time, so I,m still unsure of which one was causing it or even if all were contributing.. But the problem disappeared...
 
NZ00Z3 said:
Run the data logs and we'll do an evidence based diagnostic.
Click to expand...
ExMX5owner said:
Snippet off the net
A noisy Idle Air Control (IAC) valve, often described as a humming, buzzing, or clicking sound, can indicate a problem with the valve's function, potentially leading to issues like fluctuating idle, hard starting, or stalling. :thumbsup:

Had a similar issue with mine hunting like that when I first got it, but I did that, the DISA, and found a vac leak all at the same time, so I,m still unsure of which one was causing it or even if all were contributing.. But the problem disappeared...
Click to expand...
tthanks. We
ExMX5owner said:
Snippet off the net
A noisy Idle Air Control (IAC) valve, often described as a humming, buzzing, or clicking sound, can indicate a problem with the valve's function, potentially leading to issues like fluctuating idle, hard starting, or stalling. :thumbsup:

Had a similar issue with mine hunting like that when I first got it, but I did that, the DISA, and found a vac leak all at the same time, so I,m still unsure of which one was causing it or even if all were contributing.. But the problem disappeared...
Click to expand...
 
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