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BMW 3-Series (E90 E92) Forum
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Can tuning causes battery issues? and can bad battery causes performance issues?
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03-06-2024, 09:06 AM | #1 |
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Can tuning causes battery issues? and can bad battery causes performance issues?
For background, I've had my e93 for over a year now with no issues, the car had upgraded turbos + idx12 + FBO (on stock dp).
I recently went stage2+ mhd and everything was running fine, no boost leaks or anything. Then the car started having battery issues, where the battery would go dead if I leave it in a garage for a few hours and wouldn't hold charge. Until this morning, I noticed that the car started throwing random lights on the dash when I first started it and then they all disappeared. Then I went to driver the car and noticed that it's having problem pushing over 3000rpms at 3rd gear. No lights, no misfires, nothing. I didn't get a chance to log anything since I was on the way to bring it to a shop to get the battery replaced and had to hurry to work, although I did managed to read the codes and posting it below. I asked the shop and they said that the battery can definitely cause all type of issues for the DME and the code I read seems to adds up: - DME active codes - 2AB4 - DME: DME, internal fault: RAM checksum. 2DEC - DME: Power management, battery. 2DED - DME: Power management, closed-circuit current violation. 2EE6 - DME: Coolant-temperature sensor, measurement range. - DME shadow (inactive) codes - 2AAF - DME: Fuel pump, plausibility. 2D5F Reset - Misc. information - 3/6/2024 MHD 3.2.0 Adapter: UNI 3.86_3.25 (up to date) Voltage 13.33 V Last flashed file : v10.0 stg 2+ 93_98 VIN: WBAWL73568PX44431 CAS VIN: WBAWL73568PX44431 HW: IJE0S Factory software: 7626368 Current software: 7626368 ECU status: - - Readiness - Misfire: Complete. Fuel System: Complete. Components: Complete. Catalyst: Complete. Heated Catalyst: Not avail. Evaporative System: Complete. Secondary Air System: Not avail. A/C Refrigerant: Not avail. Oxygen Sensor: Complete. Oxygen Sensor Heater: Complete. EGR System: Not avail. Question: - Can MHD tuning causes problems to the battery? - can bad battery causes the symptoms that I'm seeing? I hope the casr will start driving better again when I pick it up today |
03-06-2024, 08:45 PM | #2 |
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Well, based on my experience, a bad battery definitely causes electronic random issues.
Once I let my car in my garage for months, and forgot to disconnect the negative in the battery, so it naturally got draing completely. After some charge, I started to use the car again but I constantly got weird electronic behaviours like ABS warnings, tilting lights, starting issues, I can't even reset the service alert anymore. So my advice, be careful when using the car with a bad battery, I think that stuff can get damage, these cars are very sensitive and any out of spec power delivery can damage stuff. |
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03-06-2024, 09:21 PM | #3 | |
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It just feels weird to me that something like this ends up messing with power output of the car, though |
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03-06-2024, 10:13 PM | #4 | |
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03-07-2024, 10:17 AM | #5 | |
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How does a parasitic draw cause lost in power performance? I mean the car could barely go pas 60mph and I was on full throttle the burbles were still there, tho |
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03-07-2024, 01:13 PM | #6 | |
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Well it doesnt effect performance. But its probably in limp mode due to other codes. |
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03-07-2024, 06:45 PM | #7 |
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okay, got the car back, the shop told me they found a loose negative cable.. which is odd, since I've been driving around for a whole year without touching it.
Oh well, they cleared the code and the car is driving good now, I'm going to continue to monitor the battery though. |
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