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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N47 and N57 Turbodiesel Engine / Drivetrain / Exhaust Modifications > Expected air mass values 320d
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      08-18-2022, 04:20 PM   #1
F30320DED
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Expected air mass values 320d

Hey there,
Recently I've been feeling like im in limp mode but I still have full power say for example il be in 3rd and on usual occasions when I put foot down the power is strong and now I have a slight delay I've noticed causing me to down shift, I've been driving for 10 years and have only ever driven diesels so its not a case of not knowing when to shift properly as its most deffo not that🤣 decided to have a look at live values on bimmertool and the expected values as you can see are well off and the others are not far off expected , now I've been saying to myself it feels like I have a slight air leak or something and then the air mass is like this so maybe they are related? Anyone else got an adapter to try out see what values you get and we can compare ?
BTW I used a enet cable to do the scan..
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      09-21-2022, 04:58 PM   #2
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Did you fix the problem?
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      09-24-2022, 06:28 AM   #3
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No.. anyone feel free to post your readings to compare against
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      02-08-2024, 09:08 AM   #4
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Hello. I’m having the exact same issue, did you solve this?
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      02-08-2024, 09:18 AM   #5
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unfortunately no.. car is still horrible to drive just avoided driving it.
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      02-17-2024, 11:35 AM   #6
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Possible causes:

1) Bad MAF sensor
2) Restriction in the intake tracts (including air filter, swirl flaps, soot clogging of the intake and valves etc)
3) Bad turbo
4) Very low engine compression
5) Bad engine timing
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      03-24-2024, 05:02 AM   #7
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Quote:
Originally Posted by TurboWeasel View Post
Possible causes:

1) Bad MAF sensor
2) Restriction in the intake tracts (including air filter, swirl flaps, soot clogging of the intake and valves etc)
3) Bad turbo
4) Very low engine compression
5) Bad engine timing
I’d suspect #2 since it’s a diesel. You can run “intake port sooting” test from ISTA. Usually, the calculated and the actual air mass should be close together. If they’re too far from each other, you should de-coke your intake tract. This can be done by either removing the entire tract and clean it or thru intake cleaner spray.

And #1 doesn’t hurt either. Just pop it out and spray it with MAF cleaner. Do the same for MAP too just in case.
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      04-05-2024, 07:04 AM   #8
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Im having same issue. Although i suspect a bad o2 sensor can cause this as i get same expected as you on MAF but my o2 sensor live data shows 0.95V (95,0 mV as it shows in bimmertool) constant which is too high. Im not sure if they relate to each other. I pulled out my o2 sensor but still show 0.95V so im guessing wires shorted somewhere or maybe bad ECU. Check what your lamba/02 values are.
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      04-05-2024, 07:07 AM   #9
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also worth mentioning. My car differs everytime on each startup. The 1600 mg/stk still stays but the power output is very different. I can star, it drives wonderful, park up and start it 5 mins later and i feel a decrease, park up and start it once again and it drives well. It just varies all the time. I really suspect that it has to do with what voltage my 02 sensor sits at. Sometimes it drops to 0.87V and i feel the car is more responsive etc.
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      04-05-2024, 08:00 AM   #10
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Hi. Have you any fault codes at present? I’ve been having an issue with 24CF00 “Air Mass Flow Sensor, Calculated to measure air Mass, Too Low”.
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      04-05-2024, 08:05 AM   #11
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nope no error codes
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      04-05-2024, 10:31 AM   #12
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Do you notice a puff of smoke on startup?
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      04-05-2024, 11:02 AM   #13
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The OP's screenshot shows a huge mis-match between expected vs actual MAF reading. This could be caused by anything that influences Air/Fuel ratio e.g. MAP/MAF/Lambda/EGR Sensor or EGR/PCV/Inlet pipework.

Do some logging against those sensors and plot a graph of Expected (also known as 'Setpoint') versus actual values.

One way to test is to unplug 1 sensor at a time and see if the car starts behaving. The ECU will have a set of defaults for many sensors that will work for period before throwing an EML or Limp mode.
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      04-05-2024, 11:34 AM   #14
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@armend195 no smoke on start up,, its remapped and no dpf dont really have this issue anymore as far as im aware was just curious at the time
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      04-05-2024, 01:21 PM   #15
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F30320DED

Im curious, how did you solve this?
Im running stage 2 and no dpf. Still have erratic MAF.

Thanks!
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      10-08-2024, 02:43 PM   #16
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Quote:
Originally Posted by armend195 View Post
F30320DED

Do you notice a puff of smoke on startup?
Sorry to resurrect an old thread but I have the same problem, high expected versus actual, and I get the puff of smoke on startup that I can't eliminate.

Little sluggish too, I'm wondering if it's turbo related but really hope not.
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      10-09-2024, 06:43 AM   #17
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Quote:
Originally Posted by TWOSOC View Post
Sorry to resurrect an old thread but I have the same problem, high expected versus actual, and I get the puff of smoke on startup that I can't eliminate.

Little sluggish too, I'm wondering if it's turbo related but really hope not.
If its doing it at Idle, it wont be your turbo.

My first guess would be EGR stuck open. I had a friend come to me a few months ago with a similar issue and his EGR actuator was knackered. You could even see traces of soot coming out of the actuator so it was worn enough to leak. He had a 2014 F30 320d which somehow missed all of the EGR/Cooler recalls.
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      10-09-2024, 03:42 PM   #18
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Well it only smokes on start up, once it's ran a few secs it clears nicely.

The actual hovered about 360-400 but the expected has sat at 2000 without moving.

Another thing that's started suddenly is a judder on acceleration edit both at idle and under load). I replaced an injector that had been plaguing me for ages as it wouldn't accept the value when reprogramming. ( They were a rebuild from Germany but the seller wasn't much help) Might be worth swapping back and seeing if it clears.?

Last edited by TWOSOC; 10-09-2024 at 05:04 PM..
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      10-09-2024, 05:29 PM   #19
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Quote:
Originally Posted by TWOSOC View Post
Well it only smokes on start up, once it's ran a few secs it clears nicely.

The actual hovered about 360-400 but the expected has sat at 2000 without moving.

Another thing that's started suddenly is a judder on acceleration edit both at idle and under load). I replaced an injector that had been plaguing me for ages as it wouldn't accept the value when reprogramming. ( They were a rebuild from Germany but the seller wasn't much help) Might be worth swapping back and seeing if it clears.?
That's another symptom of a bad EGR! If your mass values are wrong I wouldn't be changing out injectors.
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      10-09-2024, 06:35 PM   #20
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Cool, I'll have an investigation this weekend. Would it not throw a code though? I do have a spare egr from a donor engine I picked up cheap, I'll see if that's in better condition.
Thanks for giving me a direction to start.
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      10-13-2024, 12:03 PM   #21
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Hmm, did a few tests and cleans this weekend and the egr seems to be working as expected, the valve opens freely and when you test it with a six volt supply it opens and shuts nicely. The flap arm moves freely and seems to operate under its own power as it flaps on startup.

The stuttering on acceleration seems to have settled a bit and is only present under heavy acceleration over 40-50 mph. I still think it might be related to the injector I swapped seems too coincidental that it started when I replaced one. The one I swapped it out with was from the donor engine so there's no telling if it's good or not. Might rig up a spray pattern tester and see.

Still get the puff of smoke on startup but at least it's justa puff now not a cloud.

Edit: one thing I did notice when looking at the live capture is that it said 0v to the O2 sensor. Would this be normal at idle?
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      10-26-2024, 07:01 AM   #22
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So did a bit of research as it always puzzled me that the expected value didn't change, I unearthed an old forum post that the author claims to have spoken to the bimmertool dev and the late model e90's all have the glitch with this system. So my expected might not be as high as a steady 2000.
Just a heads up to anyone that might encounter the same issue.
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