Positive battery terminal melt / car start issues

Jlaflo · 12-03-2022, 02:46 PM

Hi all, hoping someone can help me with this issue. Positive terminal melted and car shut off all power to the motor as I was driving.

Purchased a brand new positive terminal wire from bmw and the car tries to crank but no start. I can smell some fuel as well after the attempt of the car starting.

All wires are connected to the new terminal
Housing as Im not getting any new codes

Anyone has any advice to fix this issue?

TopJimmy · 12-03-2022, 05:58 PM

I think you have a bigger question of "why did the positive terminal melt in the first place?". You could have a short circuit somewhere! With you smelling fuel be really careful.

mapster37 · 12-03-2022, 07:29 PM

What is the history of the battery terminal issue? May have burned a fuse by the looks of it...

dazeboy79 · 09-27-2023, 04:27 PM

This happened to me also, still trying to figure it out... I'm leaning towards the alternator now since it's OEM and I have 280k miles on my 06 330i e90. I was having to hold it down for it to start before I noticed this. Perhaps it was a bad connection.. or water got into the system.. was getting VVT voltage code but now I have more codes

I have replaced the cable & battery & now I have a crank, no start. I have also since replaced the valve cover, eccentric shaft sensor, alternator, mickey mouse flange, upper and lower radiator hoses, coolant temp sensor, oil filter housing gasket, crank shaft sensor, and a few other things I cant remember. So anyway good luck, maybe you can get it right again. I kinda want to sell it, but its high mileage.. and I've put quite a bit of time into it.. wayyy too much actually

Jlaflo · 09-27-2023, 04:29 PM

Quote:

Originally Posted by dazeboy79

This happened to me also, still trying to figure it out... I'm leaning towards the alternator now since it's OEM and I have 280k miles on my 06 330i e90. I was having to hold it down for it to start before I noticed this. Perhaps it was a bad connection.. or water got into the system.. was getting VVT voltage code but now I have more codes

I have replaced the cable & battery & now I have a crank, no start. I have also since replaced the valve cover, eccentric shaft sensor, alternator, mickey mouse flange, upper and lower radiator hoses, coolant temp sensor, oil filter housing gasket, crank shaft sensor, and a few other things I cant remember. So anyway good luck, maybe you can get it right again. I kinda want to sell it, but its high mileage.. and I've put quite a bit of time into it.. wayyy too much actually

Turns out the previous owner put a agm battery in the car and it was never coded. It shorted out the valve tronic motor. And burnt the terminals. Changed the valve tronic motor and everything worked again. Put a correct battery and codes the car.

hC1001 · 10-01-2023, 11:09 AM

Quote:

Originally Posted by Jlaflo

Turns out the previous owner put a agm battery in the car and it was never coded. It shorted out the valve tronic motor. And burnt the terminals. Changed the valve tronic motor and everything worked again. Put a correct battery and codes the car.

First thing i noticed when i saw the pics of the battery... Thats not the factory lifepo4 battery...

Glad you figured it out. Its interesting it fried the valvetronic motor, i wonder if the issues surrounding them going bad could be attributed to battery voltage issues or something like that... Or it might not have anything to do with it.

gerri · 10-01-2023, 12:43 PM

Quote:

Originally Posted by Jlaflo

Turns out the previous owner put a agm battery in the car and it was never coded.

Do you know how long that AGM battery was in the car?

12-03-2022, 02:46 PM	#1
Jlaflo Private 81 Rep 70 Posts Drives: BMW M3 F80 Join Date: Sep 2022 Location: Miami fl iTrader: (0)	Positive battery terminal melt / car start issues Hi all, hoping someone can help me with this issue. Positive terminal melted and car shut off all power to the motor as I was driving. Purchased a brand new positive terminal wire from bmw and the car tries to crank but no start. I can smell some fuel as well after the attempt of the car starting. All wires are connected to the new terminal Housing as Im not getting any new codes Anyone has any advice to fix this issue? Attached Images
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12-03-2022, 05:58 PM	#2
TopJimmy Major General 5450 Rep 5,143 Posts Drives: 2023 M3 Comp xDrive Join Date: Jul 2019 Location: Chester County, PA iTrader: (5)	I think you have a bigger question of "why did the positive terminal melt in the first place?". You could have a short circuit somewhere! With you smelling fuel be really careful. __________________ '18 F80 Base 6MT \| '19 F82 Exec DCT \| '18 F82 Comp Exec DCT \| '23 G80cx
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12-03-2022, 07:29 PM	#3
mapster37 Captain 357 Rep 923 Posts Drives: F80 Join Date: Sep 2018 Location: Davie iTrader: (2)	What is the history of the battery terminal issue? May have burned a fuse by the looks of it...
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09-27-2023, 04:27 PM	#4
dazeboy79 Registered 0 Rep 3 Posts Drives: 06 330i Join Date: Aug 2023 Location: US iTrader: (0)	#me2 This happened to me also, still trying to figure it out... I'm leaning towards the alternator now since it's OEM and I have 280k miles on my 06 330i e90. I was having to hold it down for it to start before I noticed this. Perhaps it was a bad connection.. or water got into the system.. was getting VVT voltage code but now I have more codes I have replaced the cable & battery & now I have a crank, no start. I have also since replaced the valve cover, eccentric shaft sensor, alternator, mickey mouse flange, upper and lower radiator hoses, coolant temp sensor, oil filter housing gasket, crank shaft sensor, and a few other things I cant remember. So anyway good luck, maybe you can get it right again. I kinda want to sell it, but its high mileage.. and I've put quite a bit of time into it.. wayyy too much actually
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