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DME issue or Fuel injector issue (Solved, it was the DME!)
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08-20-2023, 06:34 PM | #1 |
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DME issue or Fuel injector issue (Solved, it was the DME!)
Problem solved, it was the DME!! See post 27. Hope this helps someone out.
Hey everyone, Looking for some assistance with an issue on my 2007 335i. Was out driving a couple of nights ago and the car ran great as always (MHD Stage 2+ V10). Went to fire it up yesterday morning and was greeted by poor running and the 1/2 engine symbol, ran the codes using MHD and foxwell scanner and got 2E30 - DME Fuel Injector Cylinder 1 activation 2E31 - DME Fuel Injector Cylinder 2 activation 30AC - DME Fuel Injector Cylinder 1 activation 30AD - DME Fuel Injector Cylinder 2 activation I did a visual inspection of all of the injectors, checked the connections, checked the grounds, wiring. all looks good. Checked cyl 1 & 2 plugs, looked good as well. Pulled the DME, checked all pins for corrosion and tested the mosfets and they all tested fine. Put everything back together and still runs same, 1/2 engine symbol, runs very rough, smells like fuel from exhaust. Decided to check everything again this morning, cleared the codes and still runs the same..... Only this time when i pull the codes i have 2E31 - DME Fuel Injector Cylinder 2 activation 2E32 - DME Fuel Injector Cylinder 3 activation 30AD - DME Fuel Injector Cylinder 2 activation 30AE - DME Fuel Injector Cylinder 3 activation cylinder 1 Fuel injector magically appears to have repaired itself while cylinder 3 fuel injector now has an issue and no change to cylinder 2 fuel injector code. After this change to the issue, just to rule this out, i decided to remove my Bimmerlife coils and put the coil system back to stock with stock bmw coils. still same rough running and same codes for fuel injector cyl 2 & 3. Does anyone have any thoughts on what the issue may be? All 3 Bank 1 injectors, mosfets or the DME itself. my DME is of course the MSD80 and I have index 12 injectors i purchased from FCP several years ago when they were relatively inexpensive still, i have maybe 10k miles on them. Thanks in advance for any help with this Rube Last edited by Rube; 10-14-2023 at 03:55 PM.. |
08-21-2023, 03:26 PM | #2 |
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could be dme, altho 30BA or 30BB is missing.
One could also swap the fuel injector w known good ones or from another cylinder(s) for a quick check
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08-21-2023, 09:17 PM | #3 |
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I was thinking the same thing being that I didn’t see those codes yet. I do plan to swap in 2 used but known good injectors to check. Thanks!
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09-30-2023, 05:00 PM | #4 |
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So I replaced injectors 1,2 and 3 with known good used injectors (coded them as well). Still getting the same codes as above. I checked continuity on all the wires from the dme to the injectors and coils and all are good. The mosfets test good.
Anyone have any ideas what I can check next? I do plan to perform a compression test to rule that out. |
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09-30-2023, 05:55 PM | #5 | |
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09-30-2023, 06:08 PM | #6 |
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09-30-2023, 06:47 PM | #7 |
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09-30-2023, 06:50 PM | #8 |
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09-30-2023, 06:53 PM | #9 |
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09-30-2023, 06:57 PM | #10 |
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09-30-2023, 07:16 PM | #11 |
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index 11 and 12 have a different calibration and construction than injectors 1-10. The DME assumes each injector in a bank operate the same and thus applies the same fuel trims and adaptation values to all 3 injectors on each bank. If one of them is operating differently, it will skew these values and cause all 3 cylinders to run poorly: 1 too lean and 2 too rich, or vice versa. Also each bank has one 02 sensor so each bank is treated as a whole for fuel trims. On my 535xi a few years ago I ran index 10's and 12 on the same bank and it started misfiring. Some people get away with it and some don't. Just an option to look into.
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09-30-2023, 09:28 PM | #12 |
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When I purchased this car many years ago, it had 5 index 1 injectors and 1 index 12 injector and it ran perfectly fine. That index 12 was installed by the BMW dealership prior to my ownership, so I don’t think it’s an issue mixing the different index injectors. I proactively replaced all 6 with index 12 injectors about 4 years ago. Since I’ve been receiving these injector activation codes on cyl 1- 3 I reinstalled my old injectors (2 are index 1 and 1 is index 12) with new o rings and decoupling rings. Still getting the Same codes for cyl 1- 3 injectors. The mosfets were tested good by me and then also someone else. Wiring continuity all checks out good. I now ruled out the injectors being the issue. I guess I can check to see if I’m getting power to the injectors and a ground signal to open the injectors next, I’ll also do a compression test just In case.
Open to any ideas. Thanks everyone! |
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10-01-2023, 07:00 AM | #14 | |
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Thanks for advice I’ll monitor the O2 sensors. Could battery cause strange issues also? I charged the battery it’s around 12.1v and the alternator is charging at around 14.8v at idle. |
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10-02-2023, 01:23 PM | #15 |
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I'd lean more towards an injector/02 sensor issue since its only on that one bank. Activation fault code usually means its not connecting or reading..
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10-07-2023, 02:25 PM | #16 |
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So in this ongoing saga, I can see that the DME is supplying power/ground to bank 1 injectors during cranking (I used a test light and probed the injector plug while it was unplugged from the injector) as soon as the engine fires off, the DME shuts down bank 1 injectors. I’m leaning toward the DME being the issue, but I’m not receiving any codes specific to the DME, I’m still receiving ONLY the codes indicated in my first post.
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10-07-2023, 03:09 PM | #17 | |
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Last edited by SlowE92; 10-07-2023 at 03:14 PM.. |
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10-07-2023, 04:51 PM | #18 |
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Thanks for your help! I did flash back to stock and still same issues persist. I didn’t log anything but I Did take a pic of the MHD gauges and the bank 1 AFR is off the chart, but I’m thinking that is due to bank 1 not firing. Also I think the DME disregards the O2 values for maybe up to 30 seconds until they heat up. I also unplugged the bank 1 o2 sensor and still same, only this time I receive an o2 sensor code. I guess it wouldn’t hurt to try a new O2 sensor first.
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10-07-2023, 05:12 PM | #19 | |
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10-07-2023, 05:36 PM | #20 |
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Wouldn’t I see O2 sensor codes? I haven’t received any as of yet.
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10-07-2023, 06:39 PM | #21 |
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10-08-2023, 10:58 AM | #22 | |
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If it does turn out to be the DME, is it worth upgrading to the MSD81 ? When it is cloned, does the original vin still stay with the MSD81? |
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