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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > Cranks(hardly) and shuts off



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      06-11-2021, 08:28 AM   #1
Paul10000
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Exclamation Cranks(hardly) and shuts off

I've been having an issue with my e90. I recently changed the head gasket and Bank 1 and 2 upstream sensors. When I put everything back I went to go start it up but it wouldn't start. I have a video of what I am trying say. Idk if its the starter or a fuse but I am truly lost. The lights work and the radio lights up. Please let me know what this could be, I am completely lost.

vimeo.com/561797964
^ that's the video

<iframe src="https://player.vimeo.com/video/561797964" width="640" height="564" frameborder="0" allow="autoplay; fullscreen" allowfullscreen></iframe>

Last edited by Paul10000; 06-11-2021 at 08:33 AM.. Reason: URL didn't appear
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      06-11-2021, 11:05 PM   #2
Stuiterbal
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Did you disconnect your battery during work? Check the connectors. Can you also check the voltage? The display flickering during start could indicate low battery?
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      06-12-2021, 10:37 AM   #3
Paul10000
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I did disconnect the battery but I only took off the negative terminal, I hope doing that didn't mess anything up and I will check the voltage on the battery and get back to you but the connectors seemed ok, I traced the wire the leads to the fuse box on the passenger side so I was thinking maybe it was the junction box that failed because I got a brake light and ABS and a Triangle with a circular arrow after trying to start it up but I think I'll check the battery before buying a junction box haha Thank you!

Last edited by Paul10000; 06-12-2021 at 11:23 AM..
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      06-12-2021, 01:23 PM   #4
Paul10000
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Update: So I took the battery to Advanced auto to get it tested and it was bad, I came out with a new battery but when I installed it and tried it out nothing occurred, the screen flickered and then shut off. I tried give it more juice so I tried to jump start it from the front of the hood, it cranked but also didn't start. I think the Junction box might be my problem if that's not it ill have to do more research and if anyone has any thoughts or has been through the same thing please let me know
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      06-12-2021, 06:23 PM   #5
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vimeo.com/562296671

Update:Here's a video of what's happening currently.
Now the car won't start and its making a clicking noise (like a bad relay maybe) by the passenger side fuse box.. could it be the Junction box(BCM). I disconnected the battery completely so it wouldn't drain.
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      06-13-2021, 01:51 AM   #6
Stuiterbal
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Sorry, I wouldn't know. Now there are no lights at the dash at all? I guess we only know it must be an electrical issue then.
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      06-15-2021, 09:02 PM   #7
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I figured out the issue. My ECU was playing dead because I forgot to connect a ground wire.
I wish you guys saw the look on my face when I saw that.. man haha
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