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Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 02-20-2013, 08:01 AM   #1
basketthis
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MAF sensor monitoring. Pictures/Graphs of data. Please help!

I am looking for assistance in interpreting some graphs of sensors to determine why my idle isn't steady. I saw an old thread where someone monitored their o2 sensors for lean mixture then covered half of the MAF sensor and was able to read rich in the same sensors. I don't know where to start. I have the diagnostics tool. I can record and post any data that needs to be monitored. If anyone can tell me where to start or how to read the data, I would appreciate it very much!

EDIT:
This is the data that I've recovered from the computer while running. I was able to monitor at idle. I increased rpms to see if the MAF sensor follows. It appears that my MAF voltage follows engine speed (which it should) other than the low point where it drops to .3 V for no reason! It seems that the MAF is still acting on it's own between 640 and 700 (timeframe).
At this point, I think I'm more confused. I don't know what the next step is... Any input?!?!?

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Last edited by basketthis; 02-20-2013 at 06:31 PM.
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Old 02-20-2013, 06:31 PM   #2
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Bump for picture! And needed HELP!
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Old 02-21-2013, 09:12 AM   #3
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Just got a video of rpms in startup/warm up. Along with a graph of startup. Will post when I have the opportunity. Probably late tonight.
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Old 02-21-2013, 10:52 AM   #4
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27 as the high point is REALLY low for that RPM if you had the throttle open at all. Is it x10 (270)? Get rid of the MAF V since you have real-world MAF values already and replace it with throttle. Take another log. Post the new pic.

Last edited by smooth1; 02-21-2013 at 10:53 AM.
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Old 02-21-2013, 11:12 AM   #5
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Quote:
Originally Posted by smooth1 View Post
27 as the high point is REALLY low for that RPM if you had the throttle open at all. Is it x10 (270)? Get rid of the MAF V since you have real-world MAF values already and replace it with throttle. Take another log. Post the new pic.
Will do. Throttle was definitely open. Enough to get to about 3000 rpm.
Can post a pic later. Around 830 est tonight.
And, yes, I believe the values are on a scale. Notice that voltage shows without the decimal...

EDIT: Was just thinking about it. Would 270 be a reasonable number with the throttle open, if that were the case?

Last edited by basketthis; 02-21-2013 at 11:50 AM.
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Old 02-21-2013, 12:36 PM   #6
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Depends. That's why I want to see more info. Which vehicle is this?
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Old 02-21-2013, 12:48 PM   #7
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Quote:
Originally Posted by smooth1 View Post
Depends. That's why I want to see more info. Which vehicle is this?
2002 325xi
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Old 02-21-2013, 03:06 PM   #8
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If you want to see some data from a similar vehicle grab this software http://bimmersoftware.com/BMWLogger since it's free to playback logs. Watch the video to see how to load and play the logs.

Get some logs from here:
http://bimmersoftware.com/software/i...Datalogs/MS43/

Don't get TopSpeedRun, as this was from a 330. The other logs are from a 325 and you can use the readings to compare to similar circumstances.
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Old 02-21-2013, 03:52 PM   #9
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Quote:
Originally Posted by smooth1 View Post
If you want to see some data from a similar vehicle grab this software http://bimmersoftware.com/BMWLogger since it's free to playback logs. Watch the video to see how to load and play the logs.

Get some logs from here:
http://bimmersoftware.com/software/i...Datalogs/MS43/

Don't get TopSpeedRun, as this was from a 330. The other logs are from a 325 and you can use the readings to compare to similar circumstances.
Thank you for your replies. I will check this out when I get home. I will also post the information you requested!
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Old 02-21-2013, 05:42 PM   #10
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No problem. Sounds good.
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Old 02-21-2013, 08:12 PM   #11
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Hopefully this is what you were looking for:
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Old 02-21-2013, 11:05 PM   #12
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These graphs are not very good, but idle looks pretty flat so I don't understand the problem.
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Old 02-22-2013, 08:02 AM   #13
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Quote:
Originally Posted by smooth1 View Post
These graphs are not very good, but idle looks pretty flat so I don't understand the problem.
The graph I've posted above is of the idle after its already warm. The main issue I'm having is that the idle isn't steady. It fluctuates. I'm going to upload a video of a start up from cold to give a better idea of how rough the idle is and how it's not steady. Also, I was able to record the example of it bogging down and even got it to stall. Will post link in a min.
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Old 02-22-2013, 08:54 AM   #14
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Do you have a blue K-Line cable?
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Old 02-22-2013, 08:55 AM   #15
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Quote:
Originally Posted by smooth1 View Post
Do you have a blue K-Line cable?
No. Is it something I can grab locally?
EDIT: Trying to research it right now.
EDIT2: video still uploading. I left a note with the video explaining what I experienced during startup. I also recorded data during the video. If you would like any pictures of any point of the video, I can post. I can also post the whole video if you would like to view every sensor on your computer. Thanks again. Hope this video finishes uploading soon! It's 5 mins long.

EDIT3: Video here: http://tinyurl.com/azhk8yh

Last edited by basketthis; 02-22-2013 at 09:45 AM.
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Old 02-22-2013, 10:51 AM   #16
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To me this is either the idle actuator control valve or your engine has extra stress from a bad pulley etc etc. If that was in fact a fully cold start I'd lean more towards the idle actuator.
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Old 02-22-2013, 10:58 AM   #17
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Quote:
Originally Posted by smooth1 View Post
To me this is either the idle actuator control valve or your engine has extra stress from a bad pulley etc etc. If that was in fact a fully cold start I'd lean more towards the idle actuator.
Yep. First start of the morning at below freezing! I'd say that's cold!
Can you give an idea of the piece you are referencing? It only brings to mind the ICV, which I don't believe you're talking about...
Side note: the ICV is clean. Very clean. Just for reference.

Also, I found a used MAF locally for 40. Would you advise giving that a shot?
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Old 02-22-2013, 11:32 AM   #18
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The software to view the diagnostic video is free. It's here: http://www1.snapon.com/diagnostics/us/SSC
And what I recorded, here:
http://speedy.sh/AfN4W/User002-30221091207.SCM

Posting this in hopes that it will help:
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Old 02-22-2013, 12:08 PM   #19
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Can you see lambda integrators? MAF in this latest graph appears to be reading pretty high. What elevation are you at?
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Old 02-22-2013, 12:20 PM   #20
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Quote:
Originally Posted by smooth1 View Post
Can you see lambda integrators? MAF in this latest graph appears to be reading pretty high. What elevation are you at?
Yes. All of the sensors are monitored at the same time. Are you able to install the software to view the recording that I've done with the diagnostic tool?
If you are able to download the software, you won't have to wait on me to post pictures. I will continue to do it. I appreciate the assistance for sure. Whatever is easier for you.
EDIT: At, or about at sea level.
EIDT2: Actually approx 12ft above sea level



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Last edited by basketthis; 02-22-2013 at 12:30 PM.
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