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      01-11-2016, 10:23 AM   #1
bmwlover0725
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Starting issues on a 2008

This is starting to drive me nuts. I've had some issues for a couple of months now. First off, my battery was getting low, but the vehicle would start randomly after several presses of the button. Only got a discharge warning after leaving the vehicle on for too long with my laptop plugged in. The other day I researched and found that the ground cable underneath the engine can cause issues because it's a braided copper that is prone to corrosion.

I replaced the ground cable, but still had starting issues. After a quick jump the car started on the first try so I figured it was the battery which was showing lower voltage than it should have for being almost 55 degrees.

I replaced the battery at that point and registered it in DIS. This morning it was 23 degrees. Doubled checked everything and it was all fine. Got in the car to start it... nothing!

I'm not sure if I should try grounding it in a different spot as some people have done, but I'm also curious about how this happens because I pop start it when cold and not working and as soon as the car warms up, I can shut it off and turn it back on with ZERO problems. I haven't pulled the manifold yet to check the starter wiring, but I'm wondering about the resistance in the actual battery leads. I've heard about the IBS and positive lead's having excessive resistance which would explain why it works when the car warms up.

Anyone have ideas?
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      01-11-2016, 02:51 PM   #2
doogee
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I had intermittent issues for months on mine. First turned out to be a loose connection on the starter solenoid, then the starter completely failed shortly after. The engine would start fine once warmed up, because the connection was better when the engine was hot.
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      01-12-2016, 10:36 AM   #3
bmwlover0725
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I've wondered if it was the starter/solenoid itself, but what makes me wonder if it's the IBS is because I jumped it with my wife's X3 in almost sub-zero temps and it didn't work until we left it plugged in for about five minutes. Perhaps the IBS is malfunctioning and can't acturately detect battery life. Jumping it wouldn't heat up the terminals enough (certainly in that weather) to magically make it start. I'm going to get on DIS on my lunch break and see if it pulls anything.
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