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BMW 3-Series (E90 E92) Forum
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30BB code, but it's not the mosfets. Any ideas?
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03-03-2015, 09:13 AM | #24 |
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I used these ones - http://www.mouser.com/Search/Product...844-IRF644SPBF
But I don't think it has anything to do with the mosfets either since the ones that I replaced all tested okay. I believe it's a fuse or loose connection somewhere, but I just have no clue where to look for it at. I tried checking all of the fuses that I could find, but they were all good. I know I've seen pictures and read about people having the exact same issue caused by some of the fuses in the DME box blowing, but I don't have those fuses in my DME box. I'm assuming that particular fuse box is located somewhere else, but I'm just not sure where to find it. |
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03-04-2015, 07:01 AM | #26 |
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Did you replace the MOSFETs from the DIY found on this forum? There are a bunch of different ones in there. I know it sounds dumb but I would make sure the right thing was replaced. I have had 3 friends just replace the single MOSFET that failed along with the coil and plug and the code never came back.
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05-31-2015, 09:21 PM | #27 |
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RyanS13,
Did you get this fixed? If so, what was the issue. I am having a similar issue without the 30BB code. |
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07-11-2016, 08:42 PM | #30 |
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You may also want to consider moving the injectors around and possibly replacing the plugs.
When my #3 injector went out, I was throwing codes for cylinder 1-3 misfire. I started by trying to determine what could impact all the cylinders at once (mosfets) in the end it was a single injector that was causing all three cylinders to report misfires. |
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09-23-2019, 10:50 PM | #32 | |
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Quote:
So, my last thought is that the problem may be the DME itself. |
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09-25-2019, 04:04 PM | #33 |
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I had the 30BA code... upgraded to MSD81 & problem solved. Had new coils & plugs already in there, and upgraded to new index 12s as preventative maintenance.
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09-29-2019, 03:33 AM | #34 | |
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Quote:
I have kind of the same problem. Have checked the MOSFET and they are all fine. Then unplugged the injector #1 and the 30BB code would clear and car would run on 5 cylinders. I thought I had a bad injector so put another one in place but still have the issue. 30BB code and misfiring on cylinders 1-2-3. I do not have an idea beside a ground somewhere. |
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03-17-2020, 07:04 PM | #35 |
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04-02-2020, 10:50 PM | #36 | |
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Quote:
change spark coils replace the dme mosfets just in case and move the injectors from 4 5 6 to 1 2 3 but still the same how did find you out was your injector # 3 bad ? Thanks, Last edited by tello2020; 04-02-2020 at 11:06 PM.. |
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05-05-2020, 10:08 PM | #38 |
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Hi everyone. Just wondering if anyone has fixed this issue. I replaced the mosfets and all check out fine. Installed ecu and was running fine for a short time and now I'm getting code 30bb. I took the injectors out and cleaned them as #4 had quite the carbon build up. Reinstalled but same issue persists. I had no ignition codes present so I swapped coil#1 with coil#4 and same problem. Swapped coils back and now coil#1 is out and code is present.
I'm going to change all coils and plugs and go from there. If that doesn't solve it, the injectors next and that leaves the ecu last. If anyone has any advice/input, I'd be very grateful! Thank you! |
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05-18-2020, 08:09 AM | #39 |
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In a similar situation with my Son’s ‘08 convertible (134k miles). Misfire codes for cylinders 1-2-3. Occasional “Too lean Bank 1” code. Fuel trims on Bank 1 in the high 20s to low 30s. The upstream O2 sensor on Bank 1 is 3x what the Bank 2 sensor reads.
With out doing any research on the issue we swapped in new coils and plugs assuming it was just a tune up issue. No change. Then we pulled and cleaned all of the injectors. No change. Moved injectors from front to back (Bank 1-2) one at a time to isolate the bad injector. No Change. Ordered a cable and INPA. Should arrive Wednesday. Does anyone have an injector laying around we can test with? With all the issues with MOSFETs on the DME; I am hesitant to use a test light on the injector leads. Does limp home cut the same cylinders or is it dependent on the codes throw? Pulled the plugs again to see what is happening in the engine only to find 1 and 2 seem dead and 3-6 are all sorted up and pig rich. Baffling! |
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12-18-2020, 04:33 PM | #42 |
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Just to give an update on how I fixed the problem back when I originally started this thread years ago...
I went through everything I could and still had the same issue, so I gave up and had the car towed to an independent shop for them to work on it. I drop the car off, and I go to eat at a fast-food place in the area with my brother. We're sitting down eating next to the windows and I look out and see my car going down the street. Got a call from the shop a few minutes later saying everything was all good, the code was gone, and the car was running fine now. The only thing the shop did that I never tried... uninstall my Cobb Accessport tune from the car. So I don't know what happened with the tune, but for some reason, something got messed up and wouldn't run correctly anymore, and started throwing the 30BB code. Once the Accessport was completely uninstalled, the car was fine with no codes. I reinstalled the Accessport after picking the car up and it was fine from that day on, never had an issue with it again. Probably might not be much help to the others who are having this issue, but this was my experience. |
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01-25-2021, 06:07 PM | #44 |
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I'm running into this issue after installing new index 12 injectors. I have codes for both banks 30BB and 30AA. I already have an MSD81, new coils and new plugs. Is there a way to "reset" the DME? I'm stumped
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