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Old Mon, Feb-27-2017, 04:20:30 PM   #561
Obioban
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Default Re: Obioban's 2001 Le Mans blue M5

Desalted the car a bit on Saturday (wash it). Drove the car all day without issue.

Parked it, battery almost died overnight (enough for cabin lights, not enough for engine cranking).

Hooked up the CTEK all day Sunday, looked for anything that was left on Sunday night, drove the car to/from dinner Sunday without issue. Came home, parked car...

This morning the battery is dead. CTEK hooked up again as we speak.

Before I start going through it system by system, any common drains that could be triggered by washing the car?

Battery is only ~3 years old, so it feels unlikely that is the problem... though it is the next thing I'm going to check.
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Old Mon, Feb-27-2017, 07:25:49 PM   #562
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Default Re: Obioban's 2001 Le Mans blue M5

That sounds strange.
Maybe it really is the battery... My past experience with that is that they can go bad for no good reason, even when recent.
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Old Mon, Feb-27-2017, 07:36:44 PM   #563
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Default Re: Obioban's 2001 Le Mans blue M5

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Originally Posted by Flow View Post
That sounds strange.
Maybe it really is the battery... My past experience with that is that they can go bad for no good reason, even when recent.
Yeah... that's where I'm leaning at the moment.
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Old Tue, Feb-28-2017, 12:20:16 AM   #564
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Default Re: Obioban's 2001 Le Mans blue M5

Quote:
Originally Posted by Obioban View Post
Desalted the car a bit on Saturday (wash it). Drove the car all day without issue.

Parked it, battery almost died overnight (enough for cabin lights, not enough for engine cranking).

Hooked up the CTEK all day Sunday, looked for anything that was left on Sunday night, drove the car to/from dinner Sunday without issue. Came home, parked car...

This morning the battery is dead. CTEK hooked up again as we speak.

Before I start going through it system by system, any common drains that could be triggered by washing the car?

Battery is only ~3 years old, so it feels unlikely that is the problem... though it is the next thing I'm going to check.
Is the CTEK telling you any issues with battery? Could be the ground cable as well...
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Old Tue, Feb-28-2017, 12:23:40 AM   #565
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Default Re: Obioban's 2001 Le Mans blue M5

Battery was the main issue when you bought the car right? I wonder if that's somehow related knowing the history.
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Old Tue, Feb-28-2017, 01:40:00 AM   #566
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Default Re: Obioban's 2001 Le Mans blue M5

use an amp meter and record your draw - start pulling fuses and see where the draw drops. Thats the easiest way to find a culprit.
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Old Tue, Feb-28-2017, 02:22:31 PM   #567
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Default Re: Obioban's 2001 Le Mans blue M5

There was no significant draw. Tested the battery, came back bad. Swapped with the 528i, let it sit overnight, fired up fine in the am. Put the battery back in the 528i, bought a new battery for the M5, and am now assuming I'm back in business....

Hopefully this was just a coincidence with the wash, and not something I have to look forward to in the future.
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Old Wed, Mar-15-2017, 08:19:25 PM   #568
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Default Re: Obioban's 2001 Le Mans blue M5

Two days ago this car was clean.

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Old Wed, Mar-15-2017, 09:50:22 PM   #569
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Default Re: Obioban's 2001 Le Mans blue M5

Such a timeless car.
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Old Wed, Apr-05-2017, 12:38:05 PM   #570
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Default Re: Obioban's 2001 Le Mans blue M5

528i update here, since i don't have a journal for it and it's also an e39....

It got nice enough outside that I've started digging into the 528i.

Did a compression/leak down test, came back good. Good news in that I won't need to pull the head off. Bad news in that I will likely never get inspired to install the M50 intake manifold if nothing forces my hand

So, pulled it apart to see what was going on. And found this:


Looks like the PO had mixed coolant types. Predictably, it formed gel, clogged the rad, and began overheating.

So, ordered a new OE water pump, thermostat, and thermostat housing (probably could have reused, but they're stupidly cheap on this car so why risk it) and an OEM rad, and let my automated engine block flushing system run for 30 min (after draining it as best I could first):


And then ran a couple of gallons of distilled water through it to get that water out:


And then put it mostly together. Unfortunately I received the wrong rad, so waiting on my new one to come to finish buttoning her up. But, I'm reasonably confident this will completely address the cars overheating issue.
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Discussing Obioban's 2001 Le Mans blue M5 in the Member Journals Forum - Do you have a long term project you would like to share with the community? Use this forum to create a single thread which you can update over time to document the progress. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)