[Rube]

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

[Sgop335]

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

[Rube]

Originally Posted by Sgop335

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

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!

[Rube]

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.

[SlowE92]

Originally Posted by Rube

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.

Are you mixing injectors? or are they all the same index

[Rube]

Originally Posted by MakoB96

Are you mixing injectors? or are they all the same index

Mixed. So I just used 2 index 1's and 1 index 12. Which are my old injectors which were working fine when I replaced them a few years ago

[SlowE92]

Originally Posted by Rube

Mixed. So I just used 2 index 1's and 1 index 12. Which are my old injectors which were working fine when I replaced them a few years ago

From what I know, you can't mix injectors 1-10 with 11,12 on the same bank.

[SlowE92]

Originally Posted by Rube

Mixed. So I just used 2 index 1's and 1 index 12. Which are my old injectors which were working fine when I replaced them a few years ago

also check to make sure the decouplers and O-rings on the injectors arent cracked or missing

[SlowE92]

Originally Posted by Rube

Mixed. So I just used 2 index 1's and 1 index 12. Which are my old injectors which were working fine when I replaced them a few years ago

But since it's only occurring on 1-3 bank, I'd guess it's probably the mix of injectors

[lowrydr310]

Originally Posted by MakoB96

From what I know, you can't mix injectors 1-10 with 11,12 on the same bank.

Where'd you hear that? Lots of folks on these forums mix them all the time without issue.

[SlowE92]

Originally Posted by lowrydr310

Where'd you hear that? Lots of folks on these forums mix them all the time without issue.

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.

[Rube]

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!

[Mrmigs2011]

If bank 1-3 only I'd be suspicious of o2 behaviour.

When was last time the intake valves were cleaned

[Rube]

Originally Posted by Mrmigs2011

If bank 1-3 only I'd be suspicious of o2 behaviour.

When was last time the intake valves were cleaned

The intake valves were cleaned about 15k miles ago.
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.

[SlowE92]

Originally Posted by Rube

The intake valves were cleaned about 15k miles ago.
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.

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..

[Rube]

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.

[SlowE92]

Originally Posted by Rube

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.

Maybe try flashing the stock map to your car and seeing if the codes persist. Like MrMigs suggested if it's isolated to that bank then it might be the 02 sensor. Can you post a log from MHD?

[Rube]

Originally Posted by MakoB96

Maybe try flashing the stock map to your car and seeing if the codes persist. Like MrMigs suggested if it's isolated to that bank then it might be the 02 sensor. Can you post a log from MHD?

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.

[SlowE92]

Originally Posted by Rube

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.

Honestly yes everything looks fairly normal minus your bank 1 running "inifinitely lean," usually indicates a fuel cut to that bank. If injectors check out and plugs and coils, 02 sensor is more than likely the culprit.

[Rube]

Originally Posted by MakoB96

Honestly yes everything looks fairly normal minus your bank 1 running "inifinitely lean," usually indicates a fuel cut to that bank. If injectors check out and plugs and coils, 02 sensor is more than likely the culprit.

Wouldn’t I see O2 sensor codes? I haven’t received any as of yet.

[SlowE92]

Originally Posted by Rube

Wouldn’t I see O2 sensor codes? I haven’t received any as of yet.

Try swapping the pre cat 02 sensors and see what happens, if the misfire swaps to 4,5,6 then youll know its the 02 sensor

[Rube]

Originally Posted by MakoB96

Try swapping the pre cat 02 sensors and see what happens, if the misfire swaps to 4,5,6 then youll know its the 02 sensor

Just tried that, unfortunately same issues in bank 1. Thanks for the suggestion.
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?