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10-24-2020, 11:21 PM | #1 |
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Intermittent power (electric) loss
Any input is appreciated. Out of the blue, my 07 M coupe started experiencing transient electric power loss. When the power loss happens:
1. the abs, e-brake, and traction control lights come on in the instrument cluster. 2. The interior lights for all buttons turn off. The nav/radio turns off. 3. The headlights stay on. 4. The car continues to drive almost fine, but it feels like the engine power is reduced. This lasts for 1-3 seconds and then back to normal. The episodes seem to only happen when the car is warmed up. They can happen randomly as one offs or 30 times in a row. Seems to happen more when I have throttle open, but it happens when idling (rolling) as well. It does not seem to happen when I’m stopped. The car starts just fine. When this first started happening, I chalked it up to the 7 year old battery. I put a new battery in, cleaned the cable terminals (neg was great; mild corrosion on the positive) and I used Vaseline for dielectric grease. My next step is to clean and check connection of the terminals in the engine compartment for jumpstarts. Would love any other suggestions though! |
10-25-2020, 12:50 PM | #3 |
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It's original. 55k miles. That will be my last resort due to cost/effort. What about the BST?
https://www.zpost.com/forums/showthr...cal+power+loss |
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10-25-2020, 05:58 PM | #4 |
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BST is a possibility, but I would have guessed that it either work (intact) or not work (blown).
Another possibility is the ignition switch, which is a common problem on BMWs
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10-26-2020, 02:59 PM | #5 |
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At that mileage you could just swap the voltage regulator and not replace the entire alternator. I did that around 80K as a proactive measure.
https://www.ebay.com/itm/NEW-VALEO-O...QAAOSwY2pesYA2 |
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Reborn_305.50 |
10-26-2020, 03:53 PM | #6 | ||
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Quote:
I replaced the ignition switch ~10k miles ago so I think that's fine. That's my problem with this issue - I agree on the BST, but I would also think if it were alternator related, I would have starting difficulty. So strange. Quote:
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10-26-2020, 04:15 PM | #7 |
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Another useful thread:
https://www.zpost.com/forums/showthread.php?t=1021920 |
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10-26-2020, 09:18 PM | #8 |
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Had the same issue this summer.
Scanned the ecu and note a code for ABS over voltage. Did some research and Swapped the alternator, now trouble free. I did find an eBay seller that just sold the voltage regulator which would have likely solved it but didn’t want to waste too much time on this. |
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Reborn_305.50 |
10-26-2020, 10:22 PM | #9 |
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Yea. I figure if I’m removing the alternator, I may as well replace it and the voltage regulator. Still need to check under the hood connections and hook up INPA before I buy parts.
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11-21-2020, 11:25 PM | #11 |
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Installed the new alternator. No symptoms on a drive that had exhibited symptoms twice before (picking up food at a favorite spot), so looks like the voltage regulator was the culprit. I'll keep an eye on it as I get some more miles racked up, but unless I reply back, the issue is solved! Thanks to everyone for the insight - greatly appreciated!
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