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02-21-2018, 09:03 PM | #45 |
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I am currently having these problems with my M3
My problem just started out of the blue. I don't daily drive my M3 it's Supercharged with a VF650 kit and I replaced the battery a few weeks ago. I went to go start my M3 and I could hear my starter ticking not fully engaging like it should. I assume my starter was going bad because my battery was brand new. I decided to jump my car off just in case. When I jumped it the car started up and went in limp mode. I cut the car on and off then back on everything is fine cranking on and off no problem.
I decided to drive the car 2 1/2 hours to my mechanic friend. This is the only guy I trust to look at my Supercharged M3 to have him verify if my starter is good or not. We removed the VF manifold and everything to get to the starter. We tested the starter and it was working fine the test was good. When I went to go start the car back up after we put everything back together the starter started ticking again. It was acting like it did not have enough power to start the car . We jumped off the car it went in limp mode. Cut the car off tuned it back on everything is fine. We check the voltage and notice the Alternator was not charging the way it should. The highest it was reading was 13.9 then going lower 13.6, 13.5, 13.3, 13.1 my P3 gauge inside the car was also reading the same as the other measuring devices we were using. I drove my car 2 1/2 hours back home the condition was getting worse. Driving it was like the movie Speed I had to watch my P3 gauge! with everything turned off. If the car would idle or going slow in traffic not keep a certain amount of speed keeping the car going the voltage would drop. 13.7, 13.5, 13.1, 12.9, 12.7 engine would start to stutter making funny sounds, 12.5 ohhh snap limp mode I would have to pull over cut the car off start the process all over again until I got home. I ordered a new Alternator from ECS Tuning. Normally replacing the alternator on a OEM M3 takes 30 min to a hour max. My M3 is Supercharged with a VF650 kit with a blower bracket that is in the way that makes this a 2 to 3 hour job everything is in the way . I Replaced the old Alternator with the new brand new Valeo Alternator. I cranked up the car and the voltage reads 13.7 . I take the car on a quick test drive same problem the Movie Speed event all over again voltage drop 13.9, 13.7, 13.5, 13.1, 12.9, 12.7 motor starts to stutter . I am currently still trying to figure out the problem. The car is giving no codes. .
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02-22-2018, 07:57 AM | #46 |
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^^
Odd. My battery voltage would drop as I was driving as well, but that was because I knew that the alternator was not putting out any voltage, thus just draining my battery slowly. If you have Carly, I believe there is a parameter called % load from generator. Which to my knowledge corresponds to the output of the alternator. When my voltage was 11.9 and dropping the % load from my generator(alternator) was 0.00%. After numerous restarts I would finally get the alternator to turn on(voltage increase to ~14.5), and thus I would get a % load reading as well. Maybe try that to see if you perhaps recieved a faulty alternator? You could also pop by an autozone, and they can do a test on the system. I know when I went and tested mine before the replacement (alternator actually turned on this time), the reading came out that my alternator was overcharging my battery. So i figured it was voltage regulator but decided to swap the whole alternator to be on the safe side. The limp mode that I was getting I believe was corresponding to my throttle actuator issue, except the time where my car shut off while driving, that I assume was the alternator. Since replacing with the new valeo I have measured my voltage numerous times, and it has checked out everytime. I saw on another post that another member was having starter issues, and the car was displaying no codes. I'll post the link below, I believe page 4 is where he figures out his issue. Also on page 6 it seems like another member was having similar issues(car starting then dying). http://www.m3post.com/forums/showthr...1142234&page=6 Best of luck man, hope you find the issue. Last edited by JP10; 02-22-2018 at 08:10 AM.. |
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04-06-2018, 12:46 PM | #47 | ||
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Saw your thread. I changed my battery a few months ago. Never had a chance to register it. Guess I need to order Carly now and see what's going on. Still on original TAs. Hoping at worst it's just a result of not registering or alternator issue. Would really prefer not to do unnecessary TA swap, especially if this is not the cause. It sounds like a way more intensive DIY, and the shop will probably fleece me for the work.
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04-06-2018, 02:05 PM | #48 | |
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Driving for months without registering an AGM battery will likely damage the battery and cut its life span significantly. edit: see thread here http://www.m3post.com/forums/showthread.php?t=1445273 |
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04-06-2018, 02:08 PM | #49 | ||
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I mean rather than 3 years, it may last 2 years and I get to swap the battery if it really goes to shit. What I don't want is for the car to stop in the middle of the road.
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04-06-2018, 02:30 PM | #50 | |
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There's no reason why these batteries shouldn't last 6 years or more. The originals did in many cases, and AGM batteries in general tend to last a long time. |
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04-06-2018, 05:49 PM | #51 | ||
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Current: 08 E90 M3 DCT SSII w/ BE RB Swap, H8 Lux 180s, MS Drop-in AF, CF spoiler, CF diffuser, OEM CF leather trim, CF DCT paddles, Custom DCT flatbottom wheel, MirrorTap 9500ix, RockAuto rotors, Hawk HPS pads, AMS ECU 93 Oct Map Tune, GTS DCT update, Slambo custom undertray
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08-14-2019, 09:13 PM | #52 | |
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08-14-2019, 09:15 PM | #53 |
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Alternator throws a code. How old is your battery?
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08-15-2019, 08:44 AM | #54 | |
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If you're having a similar issue I would first monitor the voltage while driving this will give you an idea of if it is charging or not. I believe Carly has a monitoring option for alternator discharge. Mine would display 0 when not functioning properly. |
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08-15-2019, 09:41 AM | #55 | |
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08-15-2019, 10:26 AM | #56 | ||
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Only once I shut off the warmed up car and restart it will the voltage kick up past 13.8. After a few min of driving after the restart the voltage gets up to 13.9-14.4 and stays there, depending on what's on and what the car is doing (acceleration/deceleration/standing) I think, like you, my alternator is looking to be swapped out. |
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08-15-2019, 12:48 PM | #57 | ||
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08-18-2019, 04:08 PM | #59 |
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I considered a regulator change, but it was about half as much as a new alternator so I figured if it did not work, I would be out 50% more money than just having bought a new alternator in the first place. If you are certain it’s the regulator, changing it makes sense.
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08-24-2019, 10:57 PM | #60 | |||
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08-26-2019, 06:49 AM | #61 |
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Take a picture of the one brush regulator along with the stock two brush regulator. Is it one big brush? Is one of the two missing? Was it a part someone returned after knocking the first brush out on a botched DIY?
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08-26-2019, 08:07 AM | #62 |
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I'll post a pic in a couple of days when I get back to town. It's a brand new regulator that has one big brush.
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08-26-2019, 08:13 AM | #63 |
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Ok. So just a different design. Probably cheaper to make. But when you get slip ring wear and there is a raised lip between the two west paths, the one big brush might ride the lip until a groove wears into the brush. I don’t know if this could be an issue. You would see it easily if it was.
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08-26-2019, 09:24 AM | #64 | |
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08-26-2019, 10:37 AM | #65 |
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I was thinking maybe there is insufficient partial contact due to wear but you should be able to see if that is an issue. I am not an auto electrical person. Just a DIYer but I have seen alternators with badly worn slip rings. Auto electric shops will rebuild with new slip rings if they can get the parts. I have no idea whether they are available or whether this is an issue.
You did check the engine ground strap from the oil pan to frame rail? |
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08-26-2019, 11:48 AM | #66 | |
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No, I forgot to check that before getting out from under the car. I'll check on that later this week when I get back under. I'm also wondering if the positive battery terminal fix from the recall is at play here. I'll schedule an appointment to get that issue fixed sometime next week too. |
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