[NZ00Z3]

Set up OBD Fusion and while logging the 20 or so PID's listed in the PDF, run the 3 standard logs. Post links here to the CSV files and we'll have a look.

 

[NZ00Z3]

the refresh rate's so slow that it's kind of misleading if you don't know what you're looking for-
the refresh rate is below the cycle rate of the DME, so it gives random results

Hence the request for the 3 standard logs. They provide the full data set in a form that we know. Otherwise, we're into the "death by a 1,000 questions" game.

@swooshdave

• The pre-cat voltages should be cycling between 0.1V to 0.8V under normal driving conditions. It will go to 0.9V under acceleration.
• The post cat voltages should be above 0.5V with a hot engine under steady driving conditions. If they are below 0.5V then you likely have problems.

 

[NZ00Z3]

Just tried to download the files. I have an apple account. Couldn't get them.

A free DropBox account or Google drive have both worked well in the past.

 

[NZ00Z3]

Yes they work. 3 good looking logs downloaded, excellent work.

I'll go over them shortly.

 

[NZ00Z3]

What model and year is your E46?

 

[NZ00Z3]

Thank you for the excellent logs. Perfect first time up. Well done.

Here is my analysis file: 20221120 Idle Problems- Swooshdave.xlsx

The Pre-Cat O2 sensor on bank 2 is dead. Recommend that you replace both pre-cat O2 sensors. Then see what is happening.

Time Invested
It took just over an hour to spread sheet your logs and write up this post.

 

[NZ00Z3]

Yes, based on the assumption that they are the same age. If bank 1 has been replaced, then only do bank 2.

I work for free, It's my giving back to the forum that has taught me so much.

 

[NZ00Z3]

Another set of good logs. Thank you.

Here is my updated analysis file: 20221120 2001 330iX Idle Problems- Swooshdave.xlsx

Both pre-cat O2's are now working well, there is no fuel system status faults anymore. Well done.

A couple of thing s to look at:

• Check the SAP system. Make sure that you do not have a hole in a rubber hose or that the metal valve is leaking. In the Cold Start Pre-cat O2's chart, I can see the O2 sensors heat and go lean while the SAP is running. When the SAP turns off (Command secondary air goes to 4), the O2 sensors should go rich. They are not. They stay lean and the fuel trims show around 17% lean. A leaking SAP will cause lean fuel trims.
• If you haven't smoke tested the engine for vacuum leaks, then do it. Cruise fuel trims are great. Hot idle fuel trims are on the upper margin. This indicates a small vacuum leak somewhere.

You always have the option of, if it's not popping any codes, then drive it like you stole it.

Time Invested
It took a little over an hours to spread sheet your logs and write up this post.

 

[NZ00Z3]

Clear the codes and reset the adaptions as needed.

The fuel system deviation codes pop when the fuel trms exceed 10% for a predetermined time (can't remember the time).

If it's not popping codes, then enjoy driving it and tinkering with it.

 

[NZ00Z3]

Should be a MS43 for a 2001 330i, correct?

Yes

 

[NZ00Z3]

I did a search and haven’t found out how to reset the adaptations yet.

With an OBD11 scanner the adaptions and monitors get cleared when ever you clear the codes.

With some BMW scanners e.g. INPA, it is 2 separate actions.