Z3 starting probelms

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Hdz3
Joined: Thu 03 Dec, 2015 17:17
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Z3 starting probelms

Post by Hdz3 » Sat 04 Jun, 2016 16:45

Hi, sometimes. My z3 won't start, turn the key and nothing, no lights just dead, leave for a couple of mins take the key out and try again and it starts, any ideas

mrscalex
Joined: Fri 13 Mar, 2015 09:14
Posts: 795

  Z3 roadster 1.9

Re: Z3 starting probelms

Post by mrscalex » Sat 04 Jun, 2016 17:12

I had a similar problem earlier in the week. It was the battery neg clamp loose, variously making contact and then not before coming off completely.

One other idea. Worn contact pins in ignition key barrel?
ImageImage
1999 Z3 1.9 Boston Green (Dimitri) - My brother's car owned from new and restored by me
2001 Z3 2.2 Topaz Blue (Trudy) - My car rebuilt from a write-off
2002 Z3 2.2 Titan Silver (Okus) - Project car waiting for a new engine
2001 Z3 2.2 Topaz Blue (Debra) - Donor car/breaker
1998 Z3 1.9 Boston Green (Allsworth) - Donor car/breaker now gone to Z3 heaven
Always happy to try and help with spares :)

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Robert T
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Joined: Mon 12 Jun, 2006 11:35
Posts: 9983

  Z3 roadster 1.9
Location: Cheshire

Re: Z3 starting probelms

Post by Robert T » Sat 04 Jun, 2016 18:29

The chip in the ignition key is read inductively by a coil, so no pins. It could still be the immobiliser, but you would need diagnostic software to check that the immobiliser has correctly read the key. Do you have a second key to try with?

Cheers R.

Sent from my SM-T810 using Tapatalk
Arctic Silver '99 Z3 1.9 & Black '59 Frogeye 1275cc
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mrscalex
Joined: Fri 13 Mar, 2015 09:14
Posts: 795

  Z3 roadster 1.9

Re: Z3 starting probelms

Post by mrscalex » Sat 04 Jun, 2016 20:31

Robert T wrote:The chip in the ignition key is read inductively by a coil, so no pins. It could still be the immobiliser, but you would need diagnostic software to check that the immobiliser has correctly read the key. Do you have a second key to try with?

Cheers R.

Sent from my SM-T810 using Tapatalk
At some point the action of turning the key must make an electrical circuit otherwise the engine would either fire as soon as the key went in or it would never fire at all. I have no idea how exactly it works but that must be the logic?

Of course it may well not be this that's the problem and/or the pins in the barrel may be bullet proof and never wear out.
ImageImage
1999 Z3 1.9 Boston Green (Dimitri) - My brother's car owned from new and restored by me
2001 Z3 2.2 Topaz Blue (Trudy) - My car rebuilt from a write-off
2002 Z3 2.2 Titan Silver (Okus) - Project car waiting for a new engine
2001 Z3 2.2 Topaz Blue (Debra) - Donor car/breaker
1998 Z3 1.9 Boston Green (Allsworth) - Donor car/breaker now gone to Z3 heaven
Always happy to try and help with spares :)

bertiejaffa
Joined: Fri 26 Jul, 2013 10:28
Posts: 1715

  M roadster S50
Location: Manchester

Re: Z3 starting probelms

Post by bertiejaffa » Sat 04 Jun, 2016 20:48

mine was the same as mentioned. loose connector on the battery neg terminal.
Here come the girls.....
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My //M Refurb
My First Zed Journal

Hdz3
Joined: Thu 03 Dec, 2015 17:17
Posts: 17

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Re: Z3 starting probelms

Post by Hdz3 » Sat 04 Jun, 2016 21:34

Thanks, I'll check the battery connection in the morning and update

therealdb1
Joined: Tue 25 Jun, 2013 22:47
Posts: 232

  Z3 roadster 2.0

Re: Z3 starting probelms

Post by therealdb1 » Sat 04 Jun, 2016 23:22

I've had a loose negative battery terminal too with exactly those symptoms. It must be a common but peculiar issue on Z's as I've never suffered it on any other car I have driven in the last 40 years!
It takes longer to open the boot and move the carpet out of the way than to fix once you know what the problem is.
Of course if you find that the battery lead is securely fastened then you have to start the detective work.

Hdz3
Joined: Thu 03 Dec, 2015 17:17
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Re: Z3 starting probelms

Post by Hdz3 » Sun 05 Jun, 2016 17:51

Update on starting problems, the pos batt clamp was loose, it seams to me that the positive post is not high enough' is there suppose to be packing under the battery.

mrscalex
Joined: Fri 13 Mar, 2015 09:14
Posts: 795

  Z3 roadster 1.9

Re: Z3 starting probelms

Post by mrscalex » Sun 05 Jun, 2016 21:38

Hdz3 wrote:Update on starting problems, the pos batt clamp was loose, it seams to me that the positive post is not high enough' is there suppose to be packing under the battery.
Have you got the right size battery in there? Have never seen any packing.

Or has it gone the wrong lead?
ImageImage
1999 Z3 1.9 Boston Green (Dimitri) - My brother's car owned from new and restored by me
2001 Z3 2.2 Topaz Blue (Trudy) - My car rebuilt from a write-off
2002 Z3 2.2 Titan Silver (Okus) - Project car waiting for a new engine
2001 Z3 2.2 Topaz Blue (Debra) - Donor car/breaker
1998 Z3 1.9 Boston Green (Allsworth) - Donor car/breaker now gone to Z3 heaven
Always happy to try and help with spares :)

therealdb1
Joined: Tue 25 Jun, 2013 22:47
Posts: 232

  Z3 roadster 2.0

Re: Z3 starting probelms

Post by therealdb1 » Sun 05 Jun, 2016 22:52

Well it is a simple fix even if you need to replace the battery or the lead. Much easier than tracking down faults with the immobiliser or ignition switch at least!
The car would not have been designed to require packing under the battery so if you really do have to stretch the lead to reach the terminal I suspect an incorrectly sized replacement battery has been fitted at some time.

bertiejaffa
Joined: Fri 26 Jul, 2013 10:28
Posts: 1715

  M roadster S50
Location: Manchester

Re: Z3 starting probelms

Post by bertiejaffa » Mon 06 Jun, 2016 22:35

I noticed that the slight cone shape of the terminal on my battery can force the connector upwards as you tighten it sometimes which probably then results in the fraction of movement that results in this issue.

When I discovered my problem I put half a paper clip between the terminal and the connector and tightened it. The slight irregular shape seems to help with the grip and I have never had the issue since.
Here come the girls.....
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My //M Refurb
My First Zed Journal

Hdz3
Joined: Thu 03 Dec, 2015 17:17
Posts: 17

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Re: Z3 starting probelms

Post by Hdz3 » Tue 07 Jun, 2016 20:47

I would say its the wrong battery if it was taller the lead would fit nicely by the side, if it becomes loose again I'll try the paper clip trick

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