The M3cutters - UK BMW M3 Group Forum
 

Go Back   The M3cutters - UK BMW M3 Group Forum > General and Forum stuff > General Discussion



Reply
 
Thread Tools Display Modes
Old 13th August 2017, 09:06 AM   #1
sauluk
Rocking a new hat
 
sauluk's Avatar
 
Join Date: May 2012
Posts: 548
Car: F30 335i
Colour Combo: EBII / Black
Default Car won't start

Wife's car won't start. Battery reads 12.7v so seems ok (but is 7yrs old!) but turning on ignition does nothing, not even dash lights.

Hooked up to the van to jump start it, dash lights came on etc but turning ignition just set off clicking and engine wouldn't turn over.

Is it just the battery which is dead or likely something else too? Will get green flag out on Monday but no point now given garages are closed!
sauluk is offline   Reply With Quote
Sponsored links
Old 13th August 2017, 09:29 AM   #2
E46CoupeM3
Achieved official socks
 
E46CoupeM3's Avatar
 
Join Date: Oct 2012
Location: England
Posts: 11,475
Car: 2001 BMW M3
Colour Combo: Carbon Black
Default

If the battery reads 12.7 but the dash lights that take almost nothing won't comeon then the battery isn't properly connected.

Unless you have jump leads with the copper cores as big as your finger they won't usually jump straight away on the weedy ones and if the battery isn't connected the jump leads won't put anything in it over time to let it start.

If it was mine I would keep the multimeter reading the battery while someone else tries to start the car, unless the voltage dips the battery isn't connected.
E46CoupeM3 is offline   Reply With Quote
Old 13th August 2017, 09:57 AM   #3
Railgun
Achieved official socks
 
Railgun's Avatar
 
Join Date: Mar 2015
Location: Chicago -> SE London ->Maidstone
Posts: 1,226
Car: M4, RX-7, CBR600RR
Colour Combo: SMB/Black
Default

Could be a bad ground/cable as well that’s not getting enough current through it hence nothing happening when jumping.
Railgun is offline   Reply With Quote
Old 13th August 2017, 10:04 AM   #4
Rick M3
Achieved official socks
 
Rick M3's Avatar
 
Join Date: Apr 2013
Location: Preston
Posts: 7,230
Car: 2002 M3 Convertible
Default

Classic dead battery

Leave the jump leads connected for 10 mins and try again. You'll either get a slow cranking off the starter and have to leave it another 10 mins, or it'll fire
Rick M3 is offline   Reply With Quote
Old 13th August 2017, 10:09 AM   #5
sauluk
Rocking a new hat
 
sauluk's Avatar
 
Join Date: May 2012
Posts: 548
Car: F30 335i
Colour Combo: EBII / Black
Default

It's up at the in laws so I'll have to have another look. My money is on battery but not even being able to light the dash up despite there being good voltage is odd.

It all lit up with the jump cables connected so doesn't seem like battery is disconnected at all. Could be a bad ground somewhere though I guess
sauluk is offline   Reply With Quote
Old 13th August 2017, 10:13 AM   #6
tony66
Achieved official socks
 
tony66's Avatar
 
Join Date: Feb 2010
Posts: 660
Car: any
Default starting

not a great believer in jump starting modern cars-too much surge etc
i would renew battery if its as old as you say and clean connections etc
at that age it would be beneficial
tony66 is offline   Reply With Quote
Old 13th August 2017, 10:19 AM   #7
TrojanHP
Wearing official underwear
 
TrojanHP's Avatar
 
Join Date: May 2016
Posts: 212
Car: E46 M3
Default

Is it an E90?
TrojanHP is offline   Reply With Quote
Old 13th August 2017, 10:22 AM   #8
Rick M3
Achieved official socks
 
Rick M3's Avatar
 
Join Date: Apr 2013
Location: Preston
Posts: 7,230
Car: 2002 M3 Convertible
Default

Too much surge on the van ?

Jump leads rarely provide as many cranking amps as a fully charged battery
Rick M3 is offline   Reply With Quote
Old 13th August 2017, 11:05 AM   #9
E46CoupeM3
Achieved official socks
 
E46CoupeM3's Avatar
 
Join Date: Oct 2012
Location: England
Posts: 11,475
Car: 2001 BMW M3
Colour Combo: Carbon Black
Default

Quote:
Originally Posted by Rick M3 View Post
Too much surge on the van ?

Jump leads rarely provide as many cranking amps as a fully charged battery
Unless
Quote:
Originally Posted by E46CoupeM3 View Post
........Unless you have jump leads with the copper cores as big as your finger they won't usually jump straight away.........
E46CoupeM3 is offline   Reply With Quote
Old 13th August 2017, 11:56 AM   #10
bighead
Achieved official socks
 
bighead's Avatar
 
Join Date: Feb 2011
Posts: 979
Car: 2009 E90 M3
Default

Quote:
Originally Posted by E46CoupeM3 View Post
Unless you have jump leads with the copper cores as big as your finger they won't usually jump straight away.........
correct as always

Last edited by bighead; 13th August 2017 at 11:59 AM.
bighead is offline   Reply With Quote
Old 13th August 2017, 01:34 PM   #11
M3 GFY
Achieved official socks
 
M3 GFY's Avatar
 
Join Date: Oct 2015
Location: Plymouth
Posts: 6,699
Car: 2016 F83 M4 MPE
Colour Combo: Sakhir Orange/Full Black Leather with Sakhir Orange Stitching
Default

Quote:
Originally Posted by bighead View Post
correct as always
Not always.
M3 GFY is offline   Reply With Quote
Old 14th August 2017, 05:41 AM   #12
ryn004
On the path
 
ryn004's Avatar
 
Join Date: Jan 2017
Posts: 95
Car: BMW Z3
Default

Just had this problem last night with my Impreza. Healthy battery, but car won't start over. It turned out that the grounded cables needed a good clean.
ryn004 is offline   Reply With Quote
Reply

Bookmarks


Thread Tools
Display Modes



All times are GMT. The time now is 04:27 AM.


This website uses cookies. By continuing to use the site you are agreeing to our use of cookies. To find out more about the cookies this website uses, click here.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright © 2007 - 2014 M3cutters. All Rights Reserved.