|
|
|
|
|
|
BMW Garage | BMW Meets | Register | Today's Posts | Search |
|
BMW 3-Series (E90 E92) Forum
>
Problem: 335i acceleration cuts out for <1 sec mid-gear, resulting in jolt
|
|
12-03-2017, 05:04 PM | #45 |
Banned
298
Rep 650
Posts
Drives: Ferrari F430, E92 M3, 335xi
Join Date: Apr 2014
Location: Newton, MA
|
I have the same problem, no error codes. I am suspecting the throttle body, and will swap soon and report back... Subscribing to thread also.
|
Appreciate
0
|
12-15-2017, 08:06 PM | #46 |
Stupid Idiot
134
Rep 827
Posts |
Did you ever swap the throttle body? I’m chasing a similar issue on a customer’s car, and am thinking throttle issue. The engine loses power for a split second, then goes back to normal. No fault codes, and it’s really hard to reproduce. It’s like nothing I’ve ever felt on an N54 before, and I’ve been working on these things since they came out in 2006.
|
Appreciate
0
|
12-16-2017, 09:48 AM | #47 | |
Banned
298
Rep 650
Posts
Drives: Ferrari F430, E92 M3, 335xi
Join Date: Apr 2014
Location: Newton, MA
|
Quote:
I logged some data with my Carly adapter, and it seems that the bucking happens when there is a PWM request from the low pressure pump, followed by a high drop in battery voltage. EDIT: I suspect my EKPS module, low pressure sensor and/or pump, but I gave up on chasing it as cold hit New England, I don't have a garage and I need the car; took her in to a BMW specialist. Would have taken me another 2 weeks to buy stuff and replace. Will report back as soon as I hear anything, they should have some results Monday or so... Last edited by torrque; 12-16-2017 at 09:58 AM.. |
|
Appreciate
0
|
12-16-2017, 11:22 AM | #48 | |
Stupid Idiot
134
Rep 827
Posts |
Quote:
One thing that crossed my mind was a possible connection issue at the junction box. Most of these cars got the battery cable recall done, but that doesn’t mean there couldn’t be an issue back there. The voltage drop you’re seeing makes me think that’s a possibility. I’ll probably check that next if I’m given the okay to move forward. |
|
Appreciate
0
|
12-16-2017, 01:44 PM | #49 | |
Banned
298
Rep 650
Posts
Drives: Ferrari F430, E92 M3, 335xi
Join Date: Apr 2014
Location: Newton, MA
|
Quote:
It doesn't mean yours does not have the problem, worth checking. |
|
Appreciate
0
|
12-16-2017, 08:22 PM | #50 | |
Stupid Idiot
134
Rep 827
Posts |
Quote:
There’s also the actual crimp joint that’s tucked behind the carpet (where the repair cable is spliced onto the factory battery cable). I’ve seen some botched crimp jobs down there, but unfortunately it’s not possible to see anything unless you remove the heavy duty heat shrink that covers it. Usually these cars have major issues if there’s a problem with that cable connection, so your EKPS or fuel pump theory could be a good guess. I wouldn’t think the high pressure pump could cause it without setting any faults, but this is a first for me. |
|
Appreciate
0
|
12-17-2017, 10:07 AM | #51 | |
Banned
298
Rep 650
Posts
Drives: Ferrari F430, E92 M3, 335xi
Join Date: Apr 2014
Location: Newton, MA
|
Quote:
My problem is definitely electrical, as voltage drops during the event, so something is causing the drop. I was thinking of the low pressure pump, in the tank, which is the one driven by the EKPS via PWM signals... I see a high request (99%) sent to the pump also every time this jolt happens, but I am not sure if it is the cause or a symptom... The guys at BMW I took the car said when you replace the lpfp you should also replace the EKPS, and that has not been done either. Also, I looked back to all documentation I was given, and I see battery and alternator replaced, but not the cable; is that also problematic, I understand it has an active component that monitors the battery ? Many thanks! |
|
Appreciate
0
|
12-17-2017, 10:35 AM | #52 |
Banned
298
Rep 650
Posts
Drives: Ferrari F430, E92 M3, 335xi
Join Date: Apr 2014
Location: Newton, MA
|
I remembered I took some photos, here is the connection
|
Appreciate
0
|
12-17-2017, 05:03 PM | #53 | |
Stupid Idiot
134
Rep 827
Posts |
Quote:
I can tell that your car had the recall done, as it has the updated connection with the hex screw. The original cable just had a plastic clip that secured it to the JB. I’ve done probably several hundred of these recalls over the last ~5 years, and I always thought it was a little sketchy that the extra length of cable (the new section added is actually longer) just kind of gets stuffed behind the carpet and could rub/wear on the metal floor over time. I’ve never seen it be an issue myself, but I could see it being one. That said, I believe there is a fuse built into the battery power distribution box (on top of the battery) that would blow if that cable shorted to ground. But still, I could see there being contact issues in the crimp area if it wasn’t done right. As far as something that monitors the battery, you’re referring to the IBS. That’s part of the negative cable. And while they do fail a lot, they just tend to cause false battery discharge warnings. The IBS won’t cause the kind of issue you’re having. What is your voltage dropping to when you catch it in the act? |
|
Appreciate
0
|
12-17-2017, 07:26 PM | #54 |
Banned
298
Rep 650
Posts
Drives: Ferrari F430, E92 M3, 335xi
Join Date: Apr 2014
Location: Newton, MA
|
I attached this pdf, which shows the bucking/surging happening when it's highlighted in red... I ran a separate clock and noted the time minute and second when it happened, and it matched perfectly with what I have in red.
Thanks a lot Last edited by torrque; 12-17-2017 at 07:32 PM.. |
Appreciate
0
|
12-18-2017, 09:29 AM | #55 | |
Stupid Idiot
134
Rep 827
Posts |
Quote:
Either way, it looks like there is definitely a connection between the voltage drop and the commanded fuel pump %. I’d like the see this same data, but with high and low pressure values as well. It’s hard to say whether a voltage drop is causing the EKPS to bump up the fuel pump duty cycle, or whether a big load to the electrical system from the fuel pump is causing a temporary voltage drop. I think either is possible. |
|
Appreciate
0
|
12-18-2017, 09:41 AM | #56 | |
Banned
298
Rep 650
Posts
Drives: Ferrari F430, E92 M3, 335xi
Join Date: Apr 2014
Location: Newton, MA
|
Quote:
Yes, from what I noticed it's a PWM request first, and then a voltage drop most of the times.... It's never voltage drop first, and then a PWM request, so I think something is up with the pump request or EKPS. I will try to monitor the high and low pressure. |
|
Appreciate
0
|
12-18-2017, 10:19 AM | #57 |
Banned
298
Rep 650
Posts
Drives: Ferrari F430, E92 M3, 335xi
Join Date: Apr 2014
Location: Newton, MA
|
I just called the shop, and they said they found the problem. It seems to have been the crank angle sensor.... I am really confused, because that was one of the items that was replaced not long ago. I need speak to them more when I get there. They also told me it kind of smokes so turbos can be gone, but car had absolutely no smoke and signs of oil consumption or leaks when I took it in.... I really don't want to be blown turbos.
|
12-18-2017, 12:11 PM | #58 |
Stupid Idiot
134
Rep 827
Posts |
I’ve seen plenty of those crank sensors fail, but it’s usually really obvious. Super long crank, DSC warning light, etc. Not saying it’s not possible, but that’s what I’ve always seen.
|
12-19-2017, 02:45 PM | #59 | |
Banned
298
Rep 650
Posts
Drives: Ferrari F430, E92 M3, 335xi
Join Date: Apr 2014
Location: Newton, MA
|
Quote:
EDIT: I just need to sit down when they give me the bill I suppose; hopefully it is fixed and no more running around to find the fault. Straight to the Android phone she goes for a MHD stage 1 map. |
|
12-19-2017, 07:16 PM | #60 | |
Stupid Idiot
134
Rep 827
Posts |
Quote:
Be sure to update this thread when you know anything. I’m still really curious as to what’s causing it. Who knows, maybe I’ll be seeing the car again in the future. |
|
12-20-2017, 09:01 AM | #61 |
Banned
298
Rep 650
Posts
Drives: Ferrari F430, E92 M3, 335xi
Join Date: Apr 2014
Location: Newton, MA
|
ARGH, mistery was resolved. I am a fool. I replaced the DME relay in the fuse box, but not the one in the e-box.. My Bentley says the relay for 2008 is in the right hand side of the fuse box, the black one. Apparently, on these early 2008 models, it is still inside the e-box.
It was the relay in the e-box causing it, dropping power to the DME intermittently. Apparently it was a connector loose inside the socket. The crank angle sensor was also changed after the DME was rectified as it was pushing an error, car idles even better now. Hope this helps someone someday. Check your DME relays for sure when you have surging and no codes. |
12-20-2017, 09:28 AM | #62 |
Stupid Idiot
134
Rep 827
Posts |
That actually makes a lot of sense. Going into the E-box was going to be my next step, but I never got the chance. There’s a few replaceable relays in the junction box, but none are for the DME. You might have replaced a Terminal 30G relay.
And just for the record, was it actually a relay issue, or was it a loose pin in the harness that the relay plugs into? Glad it’s fixed. |
12-20-2017, 10:04 AM | #63 |
Banned
298
Rep 650
Posts
Drives: Ferrari F430, E92 M3, 335xi
Join Date: Apr 2014
Location: Newton, MA
|
It was a loose connection in the relay socket, relay is still the old one...
|
12-20-2017, 11:15 AM | #64 | |
Captain
573
Rep 870
Posts
Drives: 2009 335i E90
Join Date: Jan 2017
Location: Fremont, CA
|
Quote:
http://www.e90post.com/forums/showthread.php?t=1445102 I'd recommend not restarting 5yr old threads like this so others don't have to slog through all those old posts not related to your specific problem before finding your posts.
__________________
2008 E61 535xi Sport Wagon / 100k Miles / Deep Sea Blue Metallic / Natural Brown Interior / MHD Stage 1 91 CA-Octane Tune.
SOLD - 2009 E90 335i M-Sport Sedan / 143k Miles / Alpine White Exterior / Chestnut Brown Interior / Mishimoto FMIC / xHP Stage 2. |
|
Appreciate
0
|
12-20-2017, 11:34 AM | #65 | |
Banned
298
Rep 650
Posts
Drives: Ferrari F430, E92 M3, 335xi
Join Date: Apr 2014
Location: Newton, MA
|
Quote:
|
|
Appreciate
0
|
01-13-2018, 10:29 AM | #66 | |
Banned
298
Rep 650
Posts
Drives: Ferrari F430, E92 M3, 335xi
Join Date: Apr 2014
Location: Newton, MA
|
Quote:
At some point there were errors for Water pump voltage when problem occurred. I am away next week, but I will take it from them when I come back, I am sure they are not able to do it... I will have at it again on my own. Is it possible for the EKPM module to shut down car like that ? I am seeing PWM issues when the stutter occurs, and these modules are known to fail... Thanks all for any input again! |
|
Appreciate
0
|
Bookmarks |
|
|