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  #76  
Old 07-29-2018, 08:33 AM
BMWaufKS BMWaufKS is offline
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Just tried a number of coil swaps, including using three old coils in bank #2 (ran worse; might be a bad coil in that lot). Currently have the bank #1 and #2 coils (three each) swapped; no change in idle quality from yesterday or immediate change in the short-term mg/s fuel injections. Ground straps through the N52 valve covers are installed fine, and test as conducting.
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  #77  
Old 07-29-2018, 11:50 AM
abscate abscate is offline
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smoke test....smoke test....smoke test

...drum beat...
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  #78  
Old 07-29-2018, 12:38 PM
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New position sensors?

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  #79  
Old 07-29-2018, 01:59 PM
BMWaufKS BMWaufKS is offline
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Quote:
Originally Posted by abscate View Post
smoke test....smoke test....smoke test

...drum beat...
Done a few times already ...
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Since 1/2016, restoring a
2008 BMW X3 M-Sport, N52, automatic ("#1")
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Since 3/2017, also restoring a
2008 BMW X3 base-model, N52, automatic ("#2")
Modifications:
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  #80  
Old 07-29-2018, 02:00 PM
BMWaufKS BMWaufKS is offline
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Originally Posted by BimmurBrothor View Post
New position sensors?
Which one(s) would most likely give these symptoms?

I did just swap out the MAF sender (aftermarket one) -- no change.
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Since 3/2017, also restoring a
2008 BMW X3 base-model, N52, automatic ("#2")
Modifications:
Dashcam, cargo cover, cargo mat
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  #81  
Old 07-30-2018, 05:16 AM
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Sound Familiar? ??

https://www.bimmerfest.com/forums/sh....php?t=1282604

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  #82  
Old 07-30-2018, 08:37 AM
BMWaufKS BMWaufKS is offline
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Not exactly, but interesting.

Mentioned is a separate air temperature sensor -- I'm not finding such on our X3's N52, except for the cabin's (where's that installed)? Maybe our MAF includes that function (and already replaced). I am seeing a differential pressure sender on the intake manifold (via RealOEM).

What's the symptoms of a failing DISA on these N52s? I know they are a big problem on the M54s.
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Since 1/2016, restoring a
2008 BMW X3 M-Sport, N52, automatic ("#1")
Modifications:
All stock except dashcam

Since 3/2017, also restoring a
2008 BMW X3 base-model, N52, automatic ("#2")
Modifications:
Dashcam, cargo cover, cargo mat

Last edited by BMWaufKS; 07-30-2018 at 08:38 AM.
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  #83  
Old 07-30-2018, 08:57 AM
swampX3 swampX3 is offline
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I'm not finding such, except for the cabin's

>the evap/internal is often located just behind the radio etc ....the radio / IHKA/HVAC stuff can be popped out easily ....or you can "see" the sensor output realtime in INPA or ista+

>the external temp sensor troublemaker that gets roughed up is shown below....repair kits are available ....BUT ....you can also "see if its ranging OK with INPA or ista+ etc

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  #84  
Old 07-30-2018, 08:59 AM
swampX3 swampX3 is offline
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MAF ...what make

>you swapped the MAF for an aftermarket unit .....these can often be duds ....check the make and ensure its an OEM supplier like bosch/siemens etc
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  #85  
Old 07-30-2018, 09:03 AM
swampX3 swampX3 is offline
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you probably have 2 DISAS

What's the symptoms of a failing DISA on these N52s?

>as well as the outside of the intake disa there is a smaller disa tucked under the intake ....you can easily check their actuation with ista+

>the fail symptoms can be all over the place.....but ....we've found low power to be a regular thing....and ....the guts on the later 52 engined disas are more robust that the 54 engines
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  #86  
Old 07-30-2018, 09:20 AM
swampX3 swampX3 is offline
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"seeing" your temp sensors

>some good views/tips of looking at your sensor outputs in realtime with INPA etc.....saves loads of guessing

>you can also graph the outputs with other easily available software/plus freeze frame when problems/anomalies arise


>VERIFYING SENSORS etc

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  #87  
Old 07-30-2018, 09:20 AM
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Quote:
Originally Posted by swampX3 View Post
>the evap/internal is often located just behind the radio etc ....the radio / IHKA/HVAC stuff can be popped out easily ....or you can "see" the sensor output realtime in INPA or ista+

>the external temp sensor troublemaker that gets roughed up is shown below....repair kits are available ....BUT ....you can also "see if its ranging OK with INPA or ista+ etc

Investigated some time ago....see...https://www.bimmerfest.com/forums/sh....php?t=1269554

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  #88  
Old 07-30-2018, 09:30 AM
swampX3 swampX3 is offline
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the 2 disa intake manifold

>generic 06-10 ish x3 intake showing both disas...parts 2 and 3

https://www.realoem.com/bmw/enUS/sho...diagId=11_3756
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  #89  
Old 07-31-2018, 06:03 AM
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Quote:
Originally Posted by swampX3 View Post
>you swapped the MAF for an aftermarket unit .....these can often be duds ....check the make and ensure its an OEM supplier like bosch/siemens etc
Several months ago i installed an aftermarket maf ($20) on the 05...instantly after turning on the ignition the X3 rejected it with a code and rough idialing...without hesitation I installed the OEM ...will not do that again.

05 X3 181k
04 X3 162k
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  #90  
Old 08-09-2018, 05:15 AM
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Possibly Helpful...
m.carcomplaints. com
A lot here...Research your model or future model see what are known flaws, tendencies and corrections all at one site.
Do your research.

05 X3 181k
04 X3 162k
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  #91  
Old 08-10-2018, 12:02 AM
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Originally Posted by BMWaufKS View Post
Thanks. Car is sitting; too many other projects right now.


no more from me friend

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  #92  
Old 08-22-2018, 03:26 PM
BMWaufKS BMWaufKS is offline
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Unhappy The plot thickens (even more ...)

Had only a little bit of time to work on it, and got unexpected results.

Started and ran well (sitting in the driveway). I retook the F/A trims:

700 RPM Bank 1 Bank 2
Short-term 0.23 0.17 mg/s
Long-term -15.13% +292.72%

2500 RPM
Short-term 0.06 0.04
Long-term same as above

Then one last try on the coils: I swapped the rear three with the front three, expecting no change. Wrong! Varying idle, some misfires, and the 29E1 and 29E0 "mix control" errors within the first minute. Cleared those and restarted, codes did not return, the idle cleared up, but then got poor again. Trims were now:

700 RPM Bank 1 Bank 2
Short-term 0.76 0.64 mg/s
Long-term same as above

2500 RPM
Short-term 0.23 0.17
Long-term same as above

Out of time now, but the next thing I'll try is swapping three coils from X3 #2 to see the effect.
__________________
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Since 1/2016, restoring a
2008 BMW X3 M-Sport, N52, automatic ("#1")
Modifications:
All stock except dashcam

Since 3/2017, also restoring a
2008 BMW X3 base-model, N52, automatic ("#2")
Modifications:
Dashcam, cargo cover, cargo mat
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  #93  
Old 08-24-2018, 11:16 PM
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BimmurBrothor BimmurBrothor is offline
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I'm now I think experiencing a small kick (knew i should have stayed away from this thread) ***128514;at 10 to 15 miles per hour just as I'm taking off from the line and then normal smooth. I'm first thinking low trans fluid...just before noticing this...the trans oil cooler popped off...I went into emergency mode to correct it. Never the less I have a suspension that it might be the center bearing....no lights or codes...could this be a slight misfire?

05 X3 181k
04 X3 162k
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  #94  
Old 08-25-2018, 02:29 AM
abscate abscate is offline
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Quote:
Originally Posted by BMWaufKS View Post
Had only a little bit of time to work on it, and got unexpected results.

Started and ran well (sitting in the driveway). I retook the F/A trims:

700 RPM Bank 1 Bank 2
Short-term 0.23 0.17 mg/s
Long-term -15.13% +292.72%

2500 RPM
Short-term 0.06 0.04
Long-term same as above

Then one last try on the coils: I swapped the rear three with the front three, expecting no change. Wrong! Varying idle, some misfires, and the 29E1 and 29E0 "mix control" errors within the first minute. Cleared those and restarted, codes did not return, the idle cleared up, but then got poor again. Trims were now:

700 RPM Bank 1 Bank 2
Short-term 0.76 0.64 mg/s
Long-term same as above

2500 RPM
Short-term 0.23 0.17
Long-term same as above

Out of time now, but the next thing I'll try is swapping three coils from X3 #2 to see the effect.
Find your vacuum leak!

How bout the intake snorkel? Has that been replaced?
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  #95  
Old 08-25-2018, 04:31 AM
BMWaufKS BMWaufKS is offline
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Smoke test done three times, with other small leaks found/repaired. No leaks from this N52's boot (much more of a problem on M54s I see), and it seems that would add excess air to both banks, not just one. Before the latest weirdness of the coils' swap, I was thinking a bad fuel injector so headed that way.
__________________
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Since 1/2016, restoring a
2008 BMW X3 M-Sport, N52, automatic ("#1")
Modifications:
All stock except dashcam

Since 3/2017, also restoring a
2008 BMW X3 base-model, N52, automatic ("#2")
Modifications:
Dashcam, cargo cover, cargo mat
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  #96  
Old 08-25-2018, 07:57 AM
BMWaufKS BMWaufKS is offline
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Just pulled and inspected the intake boot (just after the MAF sender). It's fine.

Getting it off then later back on the lower nipple is a little challenging, while not putting pressure on the flex part of the boot.

P.S. Took it for a ~4 mile drive, and it did well. It has been a long time. After returning, the long term trims were +14% and +84%. Idle got ugly, though, after a restart, but no error codes. Will hopefully drive it more this upcoming week to see what happens.
__________________
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Since 1/2016, restoring a
2008 BMW X3 M-Sport, N52, automatic ("#1")
Modifications:
All stock except dashcam

Since 3/2017, also restoring a
2008 BMW X3 base-model, N52, automatic ("#2")
Modifications:
Dashcam, cargo cover, cargo mat

Last edited by BMWaufKS; 08-25-2018 at 02:41 PM.
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  #97  
Old 08-27-2018, 02:22 PM
BMWaufKS BMWaufKS is offline
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Well ... did OK this morning (maybe 80F, no A/C), but on the way home (~5 miles, 95F, A/C on) it stalled at the last stop (first time ever). Restarted easily.

Reading about INPA, and will likely order a cable soon.
__________________
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Since 1/2016, restoring a
2008 BMW X3 M-Sport, N52, automatic ("#1")
Modifications:
All stock except dashcam

Since 3/2017, also restoring a
2008 BMW X3 base-model, N52, automatic ("#2")
Modifications:
Dashcam, cargo cover, cargo mat
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  #98  
Old 08-27-2018, 02:52 PM
swampX3 swampX3 is offline
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put the scan master on your read list too

>yes get INPA and ISTA+ and build your ability.....BUT.....put the scan master on your read list too.....with it you can graph/track/freeze frame that you cannot easily do with the other stuff ....a must have investment

>a good fiftees kid video on the scan master to track O2 sensors/cat converter performance etc

O2 SENSORS/SOFTWARE/ CAT PERFORMANCE/FIFTEES KID/AUG 2018

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  #99  
Old 09-15-2018, 11:20 AM
BMWaufKS BMWaufKS is offline
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Exclamation Finally!

Got INPA installed and running; what a PITA.

Shows no current errors in the engine (N52, MSV80).

History gives 10 codes total, with the first three repeated. I don't know how many are ancient and maybe previously fixed??? The words for each error, on the right, are from various webpages and not specifically the N52/E83, so I don't know if they are correct. But if so, any of the below make sense for my symptoms?

11529 0x2D09 Throttle valve
11513 0x2CF9 TV potentiometer 1
11515 0x2CFB TV adaptation value

10721 0x29E1 Bank 1 charge air cooler temperature sensor circuit high
10720 0x29E0 Bank 1 charge air cooler temperature sensor circuit low

I'll take and post pics of the active O2/trim/etc. bar-charts/screens in the near future; out of time today.
__________________
-------------------------------------------------
Since 1/2016, restoring a
2008 BMW X3 M-Sport, N52, automatic ("#1")
Modifications:
All stock except dashcam

Since 3/2017, also restoring a
2008 BMW X3 base-model, N52, automatic ("#2")
Modifications:
Dashcam, cargo cover, cargo mat

Last edited by BMWaufKS; 09-15-2018 at 07:43 PM.
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  #100  
Old 09-16-2018, 09:37 AM
BMWaufKS BMWaufKS is offline
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Quote:
Originally Posted by swampX3 View Post
>a good fiftees kid video on the scan master to track O2 sensors/cat converter performance etc
Thanks -- that was helpful, and from that video and the following I deduce that the O2 sensors and the cats are fine, at least for now ...






From the last of the above INPA screens, while at 2000 or so RPM, the upstream O2 sensors were a bit jumpy and around 2.1 volts, while the downstream sensors were around 0.06 volts and quite stable.

Took it for a ~4 mile test drive, and it stalled once at a stop. Also generated a bunch of error codes including rough running of cylinders 4, 5, and 6. Also the 10720 and 10721 errors (fuel mixture control on banks 1 and 2).

From various websites with others trying to solve similar 10720 or 10721 problems, they say, generally: vacuum leak, O2 sensors, or fuel injector(s).

Because I hopefully addressed the first two, that leaves the injector(s). I'm going to guess that one in 4, 5, or 6 cylinder is dumping fuel. What say you?

__________________
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Since 1/2016, restoring a
2008 BMW X3 M-Sport, N52, automatic ("#1")
Modifications:
All stock except dashcam

Since 3/2017, also restoring a
2008 BMW X3 base-model, N52, automatic ("#2")
Modifications:
Dashcam, cargo cover, cargo mat
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