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post #1 of 10 Old 13th December 2016, 06:55 PM Thread Starter
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Question Strange issiue alternator/battery

Hi members!

I have a strange issiue with my beast, I have not found this issiue on the board when searching.

The issiue is that, if car has been staying for 1 week for example, when I go and start up the car, the charghing voltage drops from 12,5V down to 11-11,8V and stayes there until I get many error on idrive. Like EDC fault, battery fault, steering wheel fault, maaaany more fault. if I wait that long until the error pops up on idrive, if I shut down car, and try to restart the car. It does not have much juce on battery to start up the car, it just flickers.

Anyway, if I don't wait for the error codes on idrive, insteed I restart the car after the car has been warm. The voltage then is 14-14,4V and stayes there perfect.

The issiue with droping voltage is only if car has been staying maby 1 week and more. This strange phenomenon pops up with dropping voltage.

The voltage does not go up after a first start up when staying, it can even drop more under 11V.

I hope you members understand my issiue, and maby can have been experince. I have asked some people, and they say it is normal. But I don't think it is.

Like I said, hope you understand my bad writing.

Best regards
N.T

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post #2 of 10 Old 13th December 2016, 07:52 PM
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That sounds like what I experienced when my voltage regulator failed. I would try to drop it off for service ASAP as the electrical system's wild fluctuations boiled my battery and fried my CPU. I got a bunch of random warnings and my voltmeter showed 10.1 volts while the car was running. It clearly had been spiking the other way as well.

Sorry for the bad news. Hopefully you've caught it early enough.

-tc
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post #3 of 10 Old 13th December 2016, 08:01 PM Thread Starter
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Quote:
Originally Posted by tcannon View Post
That sounds like what I experienced when my voltage regulator failed. I would try to drop it off for service ASAP as the electrical system's wild fluctuations boiled my battery and fried my CPU. I got a bunch of random warnings and my voltmeter showed 10.1 volts while the car was running. It clearly had been spiking the other way as well.

Sorry for the bad news. Hopefully you've caught it early enough.

-tc


Thanks for info.

Did you ever test to restart and see the voltage after a restart?

Hmm Jim said that my voltage is normal and that it will increase after a while. But I do not now jet, maby I'll wait a little more and change the battery insteed. The battery have never been changed and it is 10 years old.


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post #4 of 10 Old 13th December 2016, 08:25 PM
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Well, yes and no. I had stored the car last winter and while I ran it on occasion to keep the battery charged (no outlet for a trickle charger) by Spring I needed to jump start the car off of a portable battery pack. This seemed odd to me as I had recently ran the car but figured I must not have run it for long enough and didn't think too much of it at the time. Things were fine for a week or so. Then the car needed a jump again. It hadn't alerted me to anything via iDrive and while I found it odd I didn't have a voltmeter handy and thought it must have been a lingering M5 weirdness and still didn't think too much of it.

I paid more attention when I got a wheel speed sensor, steering wheel position sensor and and ABS warning all in one shot while taking a freeway exit. I turned the car off and turned it back on again and all was fine again. I checked the voltage at some point with the car off and figured I must need a new battery as mine obviously wasn't holding a charge. Then I fired it up and saw nothing was trying to charge the battery which was the real issue. While driving to the dealer the car shut off and restarted on me while on the freeway. Came back to life in 3rd gear at 70 mph with a lot of noise and engine braking effectively both scaring the **** out of me. The dealer confirmed I needed a new alternator and once that was replaced the battery wouldn't charge and the ECU was shot.

Clearly my voltage was fine sometimes. That V10 requires a lot of spark and it wouldn't have gone far if it wasn't working sometimes. I suspect it was working rather too well at times also.

The alternator isn't a part that needs to warm up to work. It should put out a constant voltage always. You probably need a new battery as well, but if the alternator isn't putting out the right voltage replacing the battery first might force you into replacing it twice. I'd suggest taking it in rather than waiting to see what happens.

Best of luck.
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post #5 of 10 Old 13th December 2016, 11:25 PM
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M going through the same thing as I type. It stared over a month ago on cold starts. The interior lights would flicker and then cluster would shut off and pop back on again. I was getting SMG faults every few days as well. All was well if I just turned off and restarted the car.

Finally the car had enough and every warning that can light up did. I didn't even have power steering. I had a new battery installed and the problems went away for a few days. My battery was original to the car '07 build date. I took the car into the shop and now I'm having the alternator changed. There were crazy voltage spikes on the high and low end. I also had a very uneven idle for the first 10 minutes of a cold startup.

I hope this helps.

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post #6 of 10 Old 15th December 2016, 12:58 AM Thread Starter
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Quote:
Originally Posted by Dimm6 View Post
M going through the same thing as I type. It stared over a month ago on cold starts. The interior lights would flicker and then cluster would shut off and pop back on again. I was getting SMG faults every few days as well. All was well if I just turned off and restarted the car.

Finally the car had enough and every warning that can light up did. I didn't even have power steering. I had a new battery installed and the problems went away for a few days. My battery was original to the car '07 build date. I took the car into the shop and now I'm having the alternator changed. There were crazy voltage spikes on the high and low end. I also had a very uneven idle for the first 10 minutes of a cold startup.

I hope this helps.

yeah, strange. My idle was uneven at cold start, but it jumped like 50rpm up and down for 15 sec and stoped. I changed the fuel filter and that fixed that issiue.

I will start and change the battery, and meassure again after change. But I can not do that now THIS YEAR hahaha. but after new year I have a lot time to fix this before summer is here again.

I will report all things I do on car for this issiue, I have taken off the fan and will most likely take of the regulator and check that to.

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post #7 of 10 Old 15th December 2016, 01:00 AM Thread Starter
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Thanks guys.

I will report back to you when I have fixed this, and maby help other that had this issiue.

Regulator will be checked maby this weekend.

Best regards

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post #8 of 10 Old 9th March 2017, 05:04 AM
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Strange issiue alternator/battery

Quote:
Originally Posted by tcannon View Post
Well, yes and no. I had stored the car last winter and while I ran it on occasion to keep the battery charged (no outlet for a trickle charger) by Spring I needed to jump start the car off of a portable battery pack. This seemed odd to me as I had recently ran the car but figured I must not have run it for long enough and didn't think too much of it at the time. Things were fine for a week or so. Then the car needed a jump again. It hadn't alerted me to anything via iDrive and while I found it odd I didn't have a voltmeter handy and thought it must have been a lingering M5 weirdness and still didn't think too much of it.

I paid more attention when I got a wheel speed sensor, steering wheel position sensor and and ABS warning all in one shot while taking a freeway exit. I turned the car off and turned it back on again and all was fine again. I checked the voltage at some point with the car off and figured I must need a new battery as mine obviously wasn't holding a charge. Then I fired it up and saw nothing was trying to charge the battery which was the real issue. While driving to the dealer the car shut off and restarted on me while on the freeway. Came back to life in 3rd gear at 70 mph with a lot of noise and engine braking effectively both scaring the **** out of me. The dealer confirmed I needed a new alternator and once that was replaced the battery wouldn't charge and the ECU was shot.

Clearly my voltage was fine sometimes. That V10 requires a lot of spark and it wouldn't have gone far if it wasn't working sometimes. I suspect it was working rather too well at times also.

The alternator isn't a part that needs to warm up to work. It should put out a constant voltage always. You probably need a new battery as well, but if the alternator isn't putting out the right voltage replacing the battery first might force you into replacing it twice. I'd suggest taking it in rather than waiting to see what happens.

Best of luck.


So what parts did you need to replace? Alternator, Battery & ECU, what was the cost?

I had the same thing happen, car you shutdown and restarted on its own on the freeway!


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post #9 of 10 Old 10th March 2017, 02:17 PM
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Quote:
Originally Posted by M5e60_87 View Post
yeah, strange. My idle was uneven at cold start, but it jumped like 50rpm up and down for 15 sec and stoped. I changed the fuel filter and that fixed that issiue.

I will start and change the battery, and meassure again after change. But I can not do that now THIS YEAR hahaha. but after new year I have a lot time to fix this before summer is here again.

I will report all things I do on car for this issiue, I have taken off the fan and will most likely take of the regulator and check that to.
I know you said you changed the fuel filter when you had the uneven idle, but did you have any other issues like hesitation when taking off in first gear or lugging in higher gears at low speeds? I'm dealing with these issues with my car and it's making me crazy. I also need have the uneven idle on startup like you described. I'm wondering if something as simple as a fuel filter can cause this. I have no codes stored which makes it more frustrating.

2008 ///M5

COLOR
Space Grey

WHEELS
BMW Style 167 (M5 offset)

SUSPENSION
BC Racing Coilovers
Dinan Carbon Fiber Strut Brace

EXHAUST
RMS Catless
Stock Section 1
Rogue Engineering X-pipe Section 2
Rogue Engineering Diablo Section 3

INTAKE
Evolve Eventuri CAI

TUNE
Evolve AlphaN

EXTERIOR MODS
Hamann Carbon Splitter rep
Carbon Rear Diffuser
AC Schnitzer Roof Spoiler
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post #10 of 10 Old 10th March 2017, 02:27 PM Thread Starter
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Quote:
Originally Posted by Dimm6 View Post
I know you said you changed the fuel filter when you had the uneven idle, but did you have any other issues like hesitation when taking off in first gear or lugging in higher gears at low speeds? I'm dealing with these issues with my car and it's making me crazy. I also need have the uneven idle on startup like you described. I'm wondering if something as simple as a fuel filter can cause this. I have no codes stored which makes it more frustrating.


No, car run perfect. It onlt was at startup that it moved the idle.

Yea, if it has not been changed then start with the fuel filter, then the canister can also be a cause to change also


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