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  #101  
Old 09-16-2018, 02:26 PM
BMWaufKS BMWaufKS is online now
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Too many things to do, and too little time, but did get the N52's top apart down to where it's time to disconnect the fuel. Due to possible continued leakage of gas (expansion in tank pushes it out the line ...), I want to do it all at once (injectors out, tested, cleaned) -- or at least to get it sealed back up quickly.

Did attach my tester batteries (12V), switch, and adapter-plug to each injector, though, one-by-one, and they all clicked fine when rapidly powered on/off. Except at first #6 that may have been a slightly duller sound.
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  #102  
Old 09-17-2018, 03:59 PM
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Unhappy Yikes

Pulling and cleaning the fuel injectors went quickly, and I reinstalled them in reverse, e.g., 1 to 6 and 6 to 1, etc., to see if the misfires moved from 4-6 to 1-3 {I'm assuming bank 2 is cylinders 4, 5, 6, and not the firing order???} . None of the injectors seemed bad.

Restarting afterward -- ran a little worse at first, but smoothed out mostly. Driving it about five miles went fairly well, although it was obviously relearning. I had not reset the adaptations.

In search of making it even better, I reset the "CBS" adaptations, via the Creator C310. Big mistake -- ran awful, including stalling immediately after starting and restarting. Got a little better, but drove (a short distance) awful. No error codes.

Reinstalled the original MAF, and no change resulted except started a little better but maybe just because it cooled off for a while. But this time there were misfire codes in cylinders 2 and 4 showing.

So, ordered a remanufactured and "tested" set of injectors to try next. The injectors not being new will hurt my confidence in them, though, if they don't improve the situation.
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Since 1/2016, restoring a
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  #103  
Old 09-18-2018, 07:18 AM
jakeoooooo jakeoooooo is offline
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I've been struggling with this lately too. I call it the 3,000 Dance. It's very consistent for me. At highway speed, going uphill and accelerating, the whole car shudders. It's at 3,000 rpm and in 4th gear, I think. I have the 5 speed. It's as if the engine cuts power off and on several times per second. As soon as you let off the gas it stops. It's so consistent and predictable that to me it's definitely engine management. I'm going through the list of 'to do's", but so far it remains the same. I will try some of the suggestions above. Thanks.

Jack - 2006 X3 - 69,000 miles
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  #104  
Old 09-18-2018, 07:19 AM
jakeoooooo jakeoooooo is offline
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Same Experience Here

I've been struggling with this lately too. I call it the 3,000 Dance. It's very consistent for me. At highway speed, going uphill and accelerating, the whole car shudders. It's at 3,000 rpm and in 4th gear, I think. I have the 5 speed. It's as if the engine cuts power off and on several times per second. As soon as you let off the gas it stops. It's so consistent and predictable that to me it's definitely engine management. I'm going through the list of 'to do's", but so far it remains the same. I will try some of the suggestions above. Thanks.

Jack - 2006 X3 - 69,000 miles
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  #105  
Old 09-18-2018, 07:26 AM
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I just read resently (someone described having the same problem ) they say it was a matter of simply changing the o2 sensors. BTW your battery fully charged?

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  #106  
Old 09-18-2018, 11:30 AM
abscate abscate is offline
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It won't be O2 sensors. If you have a miss under load, a bad mix trim would need to be so bad it would trip P0171/4 for certain

New coils and plugs if they are OEM over 100k, or aftermarket older than 50k is where I would start.
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  #107  
Old 09-18-2018, 01:34 PM
swampX3 swampX3 is offline
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SIB done ???????

>was your software taken care of to fix the early mega programming of the transmission GAF ?????
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  #108  
Old 09-22-2018, 09:47 AM
BMWaufKS BMWaufKS is online now
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Unhappy This s*cks

Quote:
Originally Posted by mtbrdad View Post
Then I have my indy tell me it's bad gas and sure enough after I run through the bad tank of gas and fill it up, no more stall/surge problems.
Not much time, still, to figger this problem out, but have gone back through all the comments. So it was time to try the above.

Siphoned out five gallons, and separately siphoned out all the gas from my mower, and put the X3's gas in its place. Mower started and ran for a few minutes fine, but I have to wait for the grass to dry out to then fully test the fuel via the mower.

Here's my recent thread on siphoning:
https://www.bimmerfest.com/forums/sh....php?t=1295331
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Since 1/2016, restoring a
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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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  #109  
Old 09-22-2018, 11:45 AM
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Quote:
Originally Posted by BMWaufKS View Post
Not much time, still, to figger this problem out, but have gone back through all the comments. So it was time to try the above.

Siphoned out five gallons, and separately siphoned out all the gas from my mower, and put the X3's gas in its place. Mower started and ran for a few minutes fine, but I have to wait for the grass to dry out to then fully test the fuel via the mower.

Here's my recent thread on siphoning:
https://www.bimmerfest.com/forums/sh....php?t=1295331
you could always cut your nabors grass

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  #110  
Old 09-22-2018, 12:56 PM
BMWaufKS BMWaufKS is online now
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It would have needed to dry out too this a.m. :-)

Just did mine, and if anything, the mower ran better. X3 runs premium where mower uses regular.

There's still about 1/4 tank in the X3, so I may drain some more when I have gas-can space to see if there is water, etc. in the bottom. But I'd guess not -- our fuel here has 5 to 15% ethanol so any water should get absorbed.
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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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  #111  
Old 09-22-2018, 08:42 PM
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I don't know why I run across things that I end up thinking may help you...Click this one...
Bmw code 2806 transmission code please help (E46 Fanatics - BMW Forums)
https://www.e46fanatics.com/forum/sh...topics/1062407

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Last edited by BimmurBrothor; 09-22-2018 at 08:57 PM.
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  #112  
Old 09-23-2018, 05:54 AM
abscate abscate is offline
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Did those reman injectors go in yet?

I still donít like that STFT , high at idle low abt rpm points to a leak somewhere. Maybe esoterica like cracked manifold or something like that?

Tough one. Keep at it!!
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  #113  
Old 09-23-2018, 06:25 AM
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Not yet; maybe today. Still too many other non-X3 projects on the front burners.

One other curable one on the X3 popped up, and is solved. A big puddle under the front/right one morning. Thought it was antifreeze, but it was washer fluid. Replaced the two pumps and their filter/washers (Uro parts/RockAuto/maybe $12 total) to fix it.
__________________
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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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  #114  
Old 09-23-2018, 02:25 PM
BMWaufKS BMWaufKS is online now
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Smile Omg!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

May have found the problem!

And it makes some sense -- camshaft position sensor.
I read another BMW page (different model) this morning as I was searching for symptoms of a failing _crankshaft_ position sensor (CrPS), and the similar-symptoms that OP described more-matched a failing _camshaft_ position sensor (CaPS), down to not throwing a code and causing misfires.

It does make sense that an electrical component would act up as it got hotter (beginning of this summer).

I thought I had already replaced my CaPSs (two) on X3 #1, but they looked old. I know I replaced them on #2 as preventive maintenance, and I used its old ones in #1 just now. #1 ran a little rough while warming up in the driveway (maybe relearning how to be a functioning engine ), but then did fine on two shortish test drives.

Too early to declare victory though. Will let it cool off and then do a longer test drive.

Update: Looks as if I only had bought two sensors, so #1's didn't get replaced! Just ordered another pair.

Update #2: Here's my DIY thread on replacing them, for my X3 #2: https://www.bimmerfest.com/forums/sh....php?t=1090681

I think maybe I didn't do #1's because I'm using non-OEM sensors, and I wanted to see how they did.
__________________
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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; 09-23-2018 at 02:56 PM.
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  #115  
Old 09-23-2018, 02:53 PM
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Quote:
Originally Posted by BMWaufKS View Post
May have found the problem!

And it makes some sense -- camshaft position sensor.

Read another BMW page (different model) as I was searching for symptoms of a failing _crankshaft_ position sensor (CrPS), and the similar-symptoms that OP described more-matched a failing _camshaft_ position sensor (CaPS), down to not throwing a code and causing misfires.

It does make sense that an electrical component would act up as it got hotter (beginning of this summer).

I thought I had already replaced my CaPSs (two) already on X3 #1, but they looked old. I know I replaced them on #2 as preventive maintenance, and I used its old ones in #1 just now. #1 ran a little rough while warming up in the driveway (maybe relearning how to be a functioning engine ), but then did fine on two shortish test drives.

Too early to declare victory though. Will let it cool off and then do a longer test drive.

Update: Looks as if I only had bought two sensors, so #1's didn't get replaced! Just ordered another pair.
Where did you order from?

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  #116  
Old 09-23-2018, 03:02 PM
BMWaufKS BMWaufKS is online now
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A seller on eBay. Same vendor I had bought the first two from last year. RockAuto's aftermarket ones are _much_ more expensive. I can't speak to reliability of any except X3#2's are still functioning.
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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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  #117  
Old 09-23-2018, 03:13 PM
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Originally Posted by BMWaufKS View Post
A seller on eBay. Same vendor I had bought the first two from last year. RockAuto's aftermarket ones are _much_ more expensive. I can't speak to reliability of any except X3#2's are still functioning.
Private seller?...I'll need to pic up a pair....they are aftermarket....your not confident in them.

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  #118  
Old 09-23-2018, 06:06 PM
abscate abscate is offline
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There is so much counterfeit, badgered, and crap stuff in the supply line , and most of it goes out via eBay.

Any sensor I canít primary troubleshoot I buy from a reputable vendor, or I PNP

Rejected and failed parts Get sold on eBay and are indistinguishable from the good part, until you try them
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  #119  
Old 09-23-2018, 06:38 PM
BMWaufKS BMWaufKS is online now
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The valve covers weren't perfect, but seem fairly serviceable. Not remembering any bad parts except the T-Stat, and later the water pump from that seller in AZ. But otherwise, eBay parts seem fine for me -- I do check out the sellers, read the descriptions carefully, compare to FCPeuro and RockAuto, etc.

Just ordered a couple of crank position sensors. They look almost identical to the cam sensors. So if/when I'm ever working on the starters, I can change the crank sensors out too.
__________________
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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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  #120  
Old 09-23-2018, 06:40 PM
BMWaufKS BMWaufKS is online now
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P.S. ~6 mile test drive, in stop/go traffic mostly, went well. Both the engine and the trans are obviously still relearning, though.
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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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  #121  
Old 09-29-2018, 07:21 AM
BMWaufKS BMWaufKS is online now
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Doh!

The two new cam position sensors arrived a couple of days ago, and I'm installing them. But one is actually a crank sensor! Requested a replacement from the seller. The crank sender looks identical externally (for the N52), but its three electrical connector pins are closer together so the cam's connector won't fit.

If the seller doesn't want this crank sensor sent back, it's too bad I already have two of those, for the shelf, on the 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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  #122  
Old 09-29-2018, 09:19 AM
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Just finished cleaning the throttle body. It wasn't very dirty at all, just some thin, black greasy stuff. Getting the TB off/on the N52 was a little interesting, mostly due to the boots, and tight space.

No noticeable change on the idle. Not likely to test drive it for a while.
__________________
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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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  #123  
Old 09-29-2018, 12:48 PM
BMWaufKS BMWaufKS is online now
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Quote:
Originally Posted by BMWaufKS View Post
The two new cam position sensors arrived a couple of days ago, and I'm installing them. But one is actually a crank sensor! Requested a replacement from the seller. The crank sender looks identical externally (for the N52), but its three electrical connector pins are closer together so the cam's connector won't fit.
The plot thickens ... the two new crank position sensors arrived, and they and their pins look identical to the cam sensors.

So I don't know if the above one is for something different, or ...? No response from the seller yet, but it is Saturday.
__________________
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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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  #124  
Old 09-29-2018, 11:29 PM
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I've been dealing a lot with the MAF sensor as of late...I'm finding it is very intricate. It must be connected, clean and securely attached. If not it could throw codes that will have you casing for a blue goose all day long...I'm just say'n.

05 X3 181k
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Last edited by BimmurBrothor; 09-29-2018 at 11:30 PM.
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  #125  
Old 09-09-2019, 06:51 PM
mrbyteware mrbyteware is offline
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Any luck?

Was the surging/jerking problem with the X3 resolved by replacing both camshaft position sensors? I am having the same issue with the N52. Thanks
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