Check your batteries

Discussion in 'E90 Saloon / E92 Coupe / E93 Convertible M3 (2008-2013)' started by mill, Mar 25, 2020.

  1. 25 Mar 2020 at 10:33 PM #1
    mill

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    Just a heads up for you guys

    I had the airbag and seatbelt light flag up plus a warning on the display about a restraint fault

    Pluged in the Carly and it brought up a battery fault

    Checked the battery and it was surrounded by water?! And I mean deep in it

    I removed the battery, drained the water and had to replace the lug that bolts the positive to the chassis as it was literally corroded away
    Luckily I had a lug and crimp to hand but just for info you need a 25x8mm lug to crimp on the cable

    Seems the water had been coming in from the drain hole under the petrol filler cap, there must be a hose that feeds it away from the car but it seems to have failed some how
    Anyway I’ve filled the hole with silicone to blank it off as I can’t see a need for it personally and we’ll see what happens

    I’ve reset the codes and all is well but after doing some reading up seems to be a common fault

    So next time your cleaning out your boot or cleaning your car get a torch and have a good look around the battery as it’s really not very obvious

    If so get it drained and blank off the hole under the petrol cap to save you some hassle :thumbsup:
     
    Last edited: Mar 26, 2020
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  2. 26 Mar 2020 at 10:42 AM #2
    sdwalts

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    That’s worrying!
     
  3. 26 Mar 2020 at 11:07 AM #3
    mill

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    Yes very but seems I dodged a bullet with being a cheap fix
     
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  4. 26 Mar 2020 at 11:30 AM #4
    MarkRF

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    Mine sheared when I was driving.. car died, wouldn’t start/bump/jump start. Took a bit of time to work out what had happened and had to run a jump lead from the battery to the terminal under the bonnet at the front of the car to get it going.
    Water in the battery tray is common on these.
     
    Last edited: Mar 26, 2020
  5. 26 Mar 2020 at 2:30 PM #5
    harrypevo

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    The drain in the fuel cap surround is there so if you're parked on a slope the water can't fill it to a level where it would start creeping under the seal on the cap and into the tank.
     
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  6. 26 Mar 2020 at 2:50 PM #6
    BenW

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    Exactly. You have much more than a bad battery to worry about if you get water in your fuel!
     
  7. 26 Mar 2020 at 4:10 PM #7
    mill

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    Ok I’ve pulled out the silicone, I’ll try to get the wheel arch off in a couple of days to see if I can find out what’s going on under there
     
  8. 26 Mar 2020 at 9:02 PM #8
    mutts

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    LOVE THIS SITE:bow:
     
  9. 26 Mar 2020 at 9:36 PM #9
    sdwalts

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    So true! I’d never have guessed that’s what it was for!
     
  10. 27 Mar 2020 at 11:05 AM #10
    yavor

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    ...but how the drain from the tank neck compartment can send water to the battery compartment? That hose or whatever it is should be going over there?!
     
  11. 28 Mar 2020 at 4:45 PM #11
    Mike M3

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    Good info here, cheers.

    On a side note, I washed the car today and has a quick look under the bonnet. Although both leaf guards were in place, on the driver side the water did not drain out. Looks like decomposed leaves had blocked the channel further down. A quick poke with a trumpet snake and a load of water gushed out the bottom. I recall reading somewhere that an ECU got fried on an e92 that way...
     
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  12. 3 Apr 2020 at 2:46 PM #12
    sdwalts

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    Did you use any particular diameter trumpet snake or are they all the same?!
     
  13. 3 Apr 2020 at 2:54 PM #13
    Mike M3

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  14. 3 Apr 2020 at 3:11 PM #14
    sdwalts

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