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car bucking violently, cutting off
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02-17-2018, 02:16 PM | #67 | |
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02-17-2018, 06:11 PM | #68 | |
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02-17-2018, 07:25 PM | #69 |
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I suppose I can take it all out and check when I get it back if not fixed (car is at BMW now for investigation) ... It was done by a specialist shop in BMW's so in theory it should be fine. I also have solid low pressure rail over 60PSI all the time, especially now after the low pressure sensor change.
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02-17-2018, 08:16 PM | #70 | |
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Hmm your fuel pressure does fluctuate right? A solid pressure that never changes or barely does and just flat lines at all time does mean a bad pressure sensor. but I'm guessing yours is fine since you changed it.. goodluck with the BMW investigation.. hopefully they finally find it! PS: just a side note, even "specialist shops" can mess up sometimes ![]() |
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02-18-2018, 10:22 AM | #71 | |
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![]() I am tempted to believe it's the wiring harness to injectors... From docs I have from previous work done at other shop, it started when they changed fuel injectors. Could have damaged the harness as I saw some missing insulation on a couple of injector wiring. If they don't find the problem, my next step is to try a new harness. |
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02-25-2018, 05:19 PM | #74 |
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Yeah, my problem is only rpm needle drops, and it bucks. All other gauges stay still. German Performance suspected the crank angle sensor (that is where the rpm info comes from) , and they replaced it, together with complete wiring all the way to DME... same difference.
Car is now for over a week at Herb Chambers BMW in Boston; I am not raising my hopes up, those guys are way too busy to spend some time to track this fault. I am sure they'll give up also soon and call me in to pick it up as is. I have a loaner in the form of a brand new 320i automatic, horrible car. If this is the new bmw, I don't want it. |
02-25-2018, 05:31 PM | #75 | |
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02-26-2018, 01:19 PM | #76 | |
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03-01-2018, 12:10 AM | #77 |
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BMW of America officially gave up chasing my fault; they said they would need to start from scratch and remove all parts that have been changed and replace whatever it needs replacing... I knew they won't fix it without an error code, they have no clue where to look.
Now back to investigation. I have a few ideas, will post back. |
03-01-2018, 12:46 AM | #78 |
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honestly your best bet at this point would be to get an OBDII scanner and take a look at all your parameters. I.e fuel trims, throttle position, fuel rail pressure, o2 sensors, Maf sensor reading just to get started.
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03-01-2018, 11:38 AM | #79 | |
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Man that really sucks. |
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03-01-2018, 11:57 AM | #80 |
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I reread this thread and keep thinking it's likely an electrical issue related to the DME, or DME itself.
That lack of codes must be overcome, otherwise you'll just continue to throw parts at it. OP: Any open recalls? What exactly are ALL your mods? First post indicated BOVs in use, not stock DVs. If not a battery terminal and/or cabling issue, then maybe it's something still DME related. I keep coming back to the lack of ANY codes whatsoever. Your supposedly new DME may still be a problem. Try a brand new OEM DME programmed by the dealership, and ensure they upgrade all subsystem modules simultaneously. Start from scratch and see if the lack of codes and/or drivability problems persist.
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03-01-2018, 04:46 PM | #81 |
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I have, if you look in the other MHD thread, I monitored the life of it... Nothing unusual. All fuel trims are fine, O2 sensors voltages are fine, HPFP and LPFP pressures are fine, just the occasional drop of rpm and stutter (which now has become so bad it's almost undriveable; it also killed it completely once, had to restart).
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03-01-2018, 04:52 PM | #82 | |
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Dme has been reprogrammed, and on first drive, has behaved EXACTLY the same; throwing money on another DME is 99% a waste. It's also an MSD81, and it will generate the proper codes as I unplug stuff for testing (for example, I unplugged everything off fuse F11, which is shared by the DME with various components, looking for a wiring or electrical fault on one of those) . I eliminated all shared electrical components on that common voltage rail, including all injectors as being a fault. I took it to BMW and they did the airbag recall, and inspected the blower heater, and it's all good (they have no parts for that recall yet). Other than that, everything has been changed on the car in the past 9 months : Injectors plugs coil packs alternator battery carbon clean done throttle body High pressure and low pressure pumps (high pressure BMW recall done) Low pressure AND high pressure sensors Crank angle sensor swapped twice, and new wiring from it to DME (this was the main suspect for a while, and I am still not 100% on this, will open it up again). Brand new main ground strap ran additional to the existing one (BMW oem strap) @MysticRob: You are right, the lack of codes is what is throwing off every mechanic investigating it. Problem is, being an electrical issue or consumption, it trips the voltage to the DME also, and it is unable to log any error, being dropped itself I believe. I have a 2-3V voltage drop every time the stutter happens, hence my theory...Changed the main DME relay for this issue, no luck, the same. Spent hours opening up the junction box and wiring , looks new, and it has the recall done (it has a screw in there, not a clamp at the back). Many thanks Last edited by torrque; 03-01-2018 at 05:06 PM.. Reason: Multiple edits, keep remembering stuff. |
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03-01-2018, 05:01 PM | #83 | |||
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03-02-2018, 11:34 AM | #84 | |
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Last edited by musa; 03-02-2018 at 12:38 PM.. |
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03-03-2018, 10:39 AM | #85 | |
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What is the chance that the second DME has the same problem as the first one, and not logging any fault codes either (just like the first one)? 1% , 0.01%, I don't know. But they are very slim, don't you agree ? If the DME is the problem, hopefully the bloody thing would just die and not start on me, but it starts and runs well... until it doesn't... Many thanks |
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03-03-2018, 11:40 AM | #86 | |
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Based on what I've read it's either a bad dme, bad wiring (maybe a rat got in the car and ate wiring to stay alive), or maybe you got a bad injector. Strange enough I had a similar issue on my e93 and it turned out to be a leaking injector that was only noticeably leaking while driving and not at idle so they replaced all the injectors under warranty, and new plugs and it was gone. I also wasnt throwong any codes. So maybe you got a defective injector even if it was new. Just something to recheck. Also of you never programmed the car and your just assuming the original tune is installed based on what the previous owner sent you id have the tune file looked at to be sure. It's possible the guy backed up a modified tune and labeled it original and didn't save the real original because he thought that he already did. This is Just another area to inpect considering bmw failed to help. Edit: if you didn't already get it, you should find a copy of rheingold and use it with a dcan cable and diagnose it better. Other apps tend to not show hidden shadow codes that only rheingold can do. Last edited by buster84; 03-03-2018 at 12:00 PM.. |
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03-03-2018, 01:46 PM | #87 | |
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I also tried stage 1 from MHD and it is the same (more pronounced bucking as it obviously boosts more). I have a brand new OEM ground to the chassis, and all battery cables and Junction box have been checked; no signs of overheating or spark or anything like that... I have eliminated the injectors as being a problem by removing the injector and coil pack connector; ran like that in 5 cylinders one by one ; the stuttering is exactly the same, no difference with any of the injectors removed. I also eliminated the DME as I said by replacing it... It is the stock tune that came with it for a N54. What I have not eliminated, is the wiring harness from the engine bay, the one connecting all sensors, injectors and coils to the DME. A couple of injectors had stray wires exposed (when I bought the car) , somebody really abused it when working on the engine. I have insulated those wires (cut, solder, shrink wrap) now, but I am thinking of buying a new wiring harness soon. Many thanks. |
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03-03-2018, 01:50 PM | #88 |
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The other thing I have not looked at, is valve conditions. I saw an invoice from previous owner for carbon cleaning about 2000 miles ago, but what if it has not been done? Can anyone confirm how it behaves with stuffed/ dirty valves, is a stuttering possible, or more of a performance problem?
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