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      04-03-2017, 02:49 PM   #1
dpaul
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Surging or oscillation at light throttle, low rpm

Over the last few months my car has developed a very annoying oscillation/surging/bucking that only occurs at low throttle opening and at relatively low rpm.

The problem most commonly manifests when getting under way from a stop light. However, it does not occur every time.

Starting is normal, idle is very smooth (once engine is warm), WOT is fine, power if excellent and throttle response is normal once at speed. Since I have a manual transmission, the bucking can be finessed without too much trouble but it still bothers the hell out of me.

I managed to capture it on a log:
http://datazap.me/u/dpaul9/log-1491247383?log=0&data=17

As you can see, little oscillations are evident in short and long term trims, spark timing, throttle position and a few other parameters.

The car has had recent plugs, the coils were new about 3K miles ago and the injectors were replaced between 5K and 8K miles. VANOS solenoids are very new as are boost solenoids.

The problem is not related to the JB4 (which I've removed for the moment) nor any flash tune - I returned the DME to stock first using MHD, then using WinKFP, without any effect on this problem. All adaptations have been reset numerous times, using MHD and using INPA ,without any effect on this problem. Had both BMS OCC and RB externalized PCV but removed both for testing which had no effect on the problem.

I'm completely stumped.
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      04-03-2017, 03:09 PM   #2
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I am currently experiencing the same problem. I have recently replaced the plugs with a step colder gapped to .18. I am wondering if this is causing the issue? Though I get no codes
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      04-03-2017, 03:16 PM   #3
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I had one step colder (NGK plugs) gapped to 0.022 (I think) and changed them to OEM just to eliminate that possible issue. No change in the problem.

I do get an occasional code which is hard to relate to the problem. It is misfire on cylinder 6 but it only occurs when the engine is stone cold. It happens pretty quickly after the engine is started but is relatively infrequent in its appearance. It is not related to plugs, coils or injectors since I've swapped all three around quite a bit but the misfire always remains on cyl 6. Compression and leakdown are similar on all cylinders except cyl 1 which is a little lower (150 vs 160 psi) on compression and a little higher (15% vs 4%) on leakdown.
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      04-03-2017, 03:25 PM   #4
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I think we have the same issue:
http://www.e90post.com/forums/showthread.php?t=1369764
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      04-03-2017, 03:36 PM   #5
dpaul
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unreali - not sure. My car never stalls - I can keep this oscillation think going for quite a while. No misfires ever associated with the oscillation.

Should add that I have no obvious vacuum leaks - the cannisters hold a vac for many minutes after the car is turned off and all the hoses were changed to silicone when I installed the inlets and outlets about a year ago..
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      04-03-2017, 03:54 PM   #6
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I have something similar going on. New plugs, coils and index 12 injectors. Car will run great than misfire and stumble. After a bit runs great again. I was getting a lambda code so just replaced the oxygen sensors in front. No change.
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      04-03-2017, 04:12 PM   #7
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Honestly Boland - I don't think your problem sounds very much like mine
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      04-03-2017, 04:25 PM   #8
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Only code I have had was once after a flash , it was relating to the t map sensor and car wouldn't start. I reflashed and it was fine. Im running 4 bar in an ER pipe
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      04-03-2017, 09:55 PM   #9
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sounds very similar to my post- see here http://www.e90post.com/forums/showthread.php?t=1366054

Looks like a few of us are suffering the same issues. I might actually flash back to a v6 map and see if it makes any difference.
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      04-03-2017, 10:27 PM   #10
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Been fighting it for about 7K miles .. vanos solenoids , front O2 sensors , TMAP and PCV-Vent tube didn't have any effect. I think its just the 130K mile turbos (injectors were replaced at 100K - FP at 105, plugs at 118K).. Oil use is about 1 qt in 1K miles. I think its just oil affecting fuel distribution and metering at light throttle openings (at least for me)

My thread - http://www.e90post.com/forums/showthread.php?t=1369764
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'13 335IS N54 (1 of 373 LeMans Blue out of 3597 total production e92)- Grey interior (1 of 24 in LMB with any trans- 1 of 14 with DCT)-MODS -MFactory LSD/MHD-BQ custom Tune/ATM-IC/AFE Momentum GT Intake/Konis/Mfront&HeimJoint Rear rods&arms/Brembos.
https://photos.app.goo.gl/Lo6aHZRo7XqtPkhL8

Last edited by 335e92tx; 04-03-2017 at 10:39 PM..
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      04-03-2017, 10:30 PM   #11
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Quote:
Originally Posted by unrealii View Post
subscribed.

I think we have the same issue:
http://www.e90post.com/forums/showthread.php?t=1369764
REset load adaptions. Might require a indy shop
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https://photos.app.goo.gl/Lo6aHZRo7XqtPkhL8
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      04-03-2017, 10:30 PM   #12
dpaul
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Speedychuck - does sound similar. Hope someone comes up with something positive soon
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      04-04-2017, 12:44 AM   #13
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Reset all adaptations via Bavarian technic tool.
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      04-04-2017, 06:06 AM   #14
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Chris - I don't have a BT cable. However, I've reset all available adaptations using MHD, using INPA and using ISTA/D, in addition to flashing original stock and update stock BINs using WinKFP and MHD. All this multiple times. Never any change whatsoever. This feels like a mechanical or electrical problem, not a software issue.

Can you tell me what the BT reset suite can do that BMW factory tools cannot?
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      04-04-2017, 07:37 AM   #15
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I tried resetting using both MHD and BTcable. Neither fixed the idle stumble. A local shop used something, never got a clear response what it was. Mine continues to have a lean surge in the 1200-1500 range at light throttle. Its actually not as noticeable now that MHD is not installed. That re-enforces my belief that it is turbo related.
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https://photos.app.goo.gl/Lo6aHZRo7XqtPkhL8
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      04-04-2017, 02:08 PM   #16
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Quote:
Originally Posted by 335e92tx View Post
I tried resetting using both MHD and BTcable. Neither fixed the idle stumble. A local shop used something, never got a clear response what it was. Mine continues to have a lean surge in the 1200-1500 range at light throttle. Its actually not as noticeable now that MHD is not installed. That re-enforces my belief that it is turbo related.
Mine does the same and occasional rough idle at lights to near stall. But my turbos are near new oems
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      04-05-2017, 08:07 AM   #17
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If possible, try to log vanos angles - intended vs actual. Could be vanos solenoids but its rare that cause idle issues I think. They arn't doing a lot a idle to my knowledge.
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      04-05-2017, 09:35 AM   #18
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I'm experiencing same issue - 2012 335is with 40k on the clock. Car has index 12 injectors all the way across, absolutely zero oil consumption, runs great under full load and idles great. It's just this issue under light throttle - it's really annoying on the highway at speeds of 65 to 75 mph. Car is bone stock.
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      04-17-2017, 02:02 PM   #19
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Mine seemed to correlate with a full tank of gas. I pulled the lpfp which I had replaced with a stage two bucketless and found the breather vent/ hose blue connection lose in the fuel and not connected to the top had. I reconnected and the issue has gone.
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      04-17-2017, 03:54 PM   #20
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I flashed back to stage 0 with linear throttle after fitting a new clutch and the problem was still there. After bedding the clutch in I've flashed back to stage 2+ and the issue is still there. It's really frustrating. I have kept linear throttle as I like the feel of it, but it's way more noticeable now because there's a larger area of throttle travel that the problem occurs in.

i did wonder if it could be related to partial injector blockage. The spray pattern could be bad at very low flow rates which maybe is causing it? Has anybody replaced injectors and still suffers this?
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      04-17-2017, 04:00 PM   #21
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My prob didnt' crop up until 15K on new injectors. Went 8 years no issues and then started at 123K miles.
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      04-17-2017, 04:03 PM   #22
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i fixed my issue with a new torque converter...

http://www.e90post.com/forums/showthread.php?t=1201992
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