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BMW 3-Series (E90 E92) Forum
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335i Bucking Surging?
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02-04-2011, 02:48 PM | #23 |
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When I had surging it only happened when i gave the car a light amount of throttle
At least my in case I would assume it has something to do with running higher boost, probably bad diverter valves with high boost like someone said before.. |
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02-04-2011, 04:10 PM | #24 |
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6AT That is exactly when I have surging, in 1st or 2nd with light amounts of throttle and high rpm.
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02-04-2011, 04:12 PM | #25 | |
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Quote:
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02-04-2011, 04:28 PM | #26 |
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HPFP
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If no codes are being thrown use Chevron Techron fuel injector cleaner (concentrate). It solves rpm fluctuating upon cold start-up. Also, for most BMW problems start off by scanning your car with the Peake Research Tool. It contains the actual BMW codes. If you want to register a newly installed battery for free (just buy a $10 cable) and google/download BMWLogger
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09-28-2015, 08:02 AM | #27 |
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MeanMangoMan, I'm not sure if you're active anymore(?), but did you ever get around to replacing the diverter valves, and did it work?
I just purchased an '07 335xi 6MT, experiencing the same surging/bucking in 1st/2nd at light throttle between 2k and 3k RPM. Sometimes more severe than others. Once I get up to 4k RPM, the car is silky smooth and has tons of power. FWIW, the service history shows it has already had the HPFP replaced. |
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10-05-2015, 12:55 PM | #28 |
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I am experiencing throttle surging under highway cruising, constant throttle (not high boost condition). Tune or stock map no difference. Plugs, coils, and injectors replaced 10K ago.
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10-05-2015, 07:12 PM | #29 |
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This was happening to me and I found out my JB4 was closing the wastegates way to far down in the rpm range causing the boost to surge in and out.
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10-05-2015, 07:29 PM | #30 |
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I get the surging a couple of times a month between 70-75mph 2400rpm once I give it a little throttle or cruise at 80 I have no problems. Its been doing this since I got the car in 2013 with stock, ppk and jb4.
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10-30-2015, 08:28 AM | #31 | |
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Anyone have any experience with this, including a diagnosis? Once again: surging/bucking (almost feels like lugging) between 2-3k RPM, light to medium throttle, 1st and 2nd gear only. Everything else is smooth as butter, and she has gobs of power when I step on it. |
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10-30-2015, 09:34 AM | #32 |
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check out midnight euro in Layton Ut
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10-31-2015, 12:32 AM | #33 |
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Wonder if it's a dirty throttle body.
Or maybe even a dirty mass airflow sensor. Problem is "surging" can have many causes--everything from what I mentioned above to bad throttle position sensor readings to occasional improper intake valve timing.
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10-31-2015, 01:08 AM | #34 |
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Drives: 2007 E92 335i
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This sounds like a fuel supply issue to me.
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10-31-2015, 07:41 AM | #35 |
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Years ago when I worked in a Service Dept and we had difficult intermittent drivability problems we would take a snap shot with a scan tool when experiencing the symptoms.
Wouldn't it make sense for those with a JB4 or Cobb to capture logs when this happens for analysis? This is an old post but intermittent drivability problems are rough to diagnose. |
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03-11-2016, 11:30 AM | #36 |
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Intermittent Surging
Would love to keep this thread alive as I just purchased a 2010 328i sedan AT. Am experiencing intermittent surging and researching on the forum. Of course the previous owner never mentioned surging issue! But he did say he only purchased his 91 octane gasoline from Costco. I only use 91 octane Chevron and have only filled it up 3 times now since purchase date - 2/10/16. Wondering if it will correct the issue over time. Someone on this thread mentioned putting in Chevron Techron fuel injector cleaner concentrate. May try that if surging continues.
If anyone remedied the surging please post on this thread! Thanks. |
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04-21-2016, 03:51 PM | #38 |
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Wow, I've been researching this 2,500-3,500rpm surge for over a year now. It seems there is no perfect answer and the problem happens often with these cars.
Folks have tried numerous things: valve cleanings, vacuum hose overhauls, replacing full ignition systems, replacing fuel injectors, VANOS cleaning, ECU re-map...nothing works for certain. I'm beginning to believe that either O2 sensors or a dirty MAP (either in the charge pipe or intake manifold) may be the culprit. Let me ask all of you, does the issue lessen/go away when the car is at full operating temperature?
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04-21-2016, 04:15 PM | #39 | |
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After carefully examining logs, mine is definitely related to the hpfp not increasing fuel demand with more throttle input causing it to buck and run lean. I'm guessing it's the FCV on the HPFP but I don't think they sell them separately from the pump. |
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04-22-2016, 09:30 AM | #40 |
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Have any of you tried doing a walnut blast? If you've tried everything else and it didn't work maybe give that a try. Unfortunately as someone else mentioned, this could be from a number of areas so you basically have to just narrow it down. Good luck.
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05-12-2016, 11:30 PM | #41 |
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surging bucking n54
I didn't want to start another thread so here's my n54 headache..
bucks substantially with steady throttle 2500-3500ish rpm, regardless of gear. so its very hard to pull away from a stop smoothly. Idle is almost always smooth, a small stumble from time to time. I've attached my data log while running a e40 blend (MHD OTS) which seems to make it much worse but, I re-flashed a stock map and although far less noticeable there are still the same markers in the data log. the throttle, and timing correction going wonky. At the end of the log I gave it full throttle and it pulls solid, I found it odd that it shows 80% throttle while the pedal is 99.6% ?! I have not done a through vac leak test, but there are no signs of it in the logs. The car has the following all within the last 16k currently has 98k MHD ots map for E40, liner throttle, 3.5bar map walnut blast new oem coil packs new factory plugs new factory fuel pumps HP and LP Bosch 044 inline fuel pump Tial BOV and ER charge pipe 3.5bar map AMS fmic ER downpipes HAD a DP fix - has been removed custom cat back occ and rb pcv Mmp inlets AFE filters smfw Spec clutch It had a stage 2 Dianan tune which the stealership promised me was the issue so I had them wipe that. Then said it was HPFP...then..so this has been going on since the car was stock + stage 2 Dinan http://datazap.me/u/sevco/surging-an...rk=119-119-240 Last edited by sevco; 05-16-2016 at 09:40 AM.. Reason: add datalog |
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05-15-2016, 05:09 PM | #42 |
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I'm getting the same issues on my 07xi really surprised there's been no solution to this . Getting surging between 25-3000 rpm and at cruising speeds. Wot pulls fine but getting bucking and surging when cruising and its driving me bonkers. Is there really no fix for this?
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07-08-2016, 04:58 PM | #43 | |
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Quote:
Last edited by Monster900; 07-08-2016 at 05:04 PM.. |
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