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Liam Murphy



Member Since: 29 Jul 2020
Location: South Wales
Posts: 92
United Kingdom 2009 Defender 110 2.5 TD HT Tamar Blue
BMW E90 weird start [video]
My BMW E90 won't start on the first attempt which is becoming annoying, it makes a surging noise on the first push start (pretty loud) but then will always start on the second attempt?



Anyone have any ideas?

Cheers!
Post #862551 20th Oct 2020 8:47am
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hank



Member Since: 12 Sep 2016
Location: South Wales
Posts: 2224
Wales 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
https://www.babybmw.net/forum/viewtopic.php?t=49798 > 110 XS Double Cab
> Instagram @simonlanemind
Post #862565 20th Oct 2020 10:04am
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Liam Murphy



Member Since: 29 Jul 2020
Location: South Wales
Posts: 92
United Kingdom 2009 Defender 110 2.5 TD HT Tamar Blue
Thanks Hank! I'll take a look at those belts but I don't think it's the same problem.

Mine doesn't start on first push button start, it does squeal as mentioned in that thread, but its definitely not a chirp. It's more like a trapped pig on fire. It also seems to surge the power too.

Occasionally it does start on first attempt but you can tell it only just caught. Always starts fine on the second attempt.

I'm praying it's not the starter motor, is a nightmare to change on these.
Post #862568 20th Oct 2020 10:27am
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hank



Member Since: 12 Sep 2016
Location: South Wales
Posts: 2224
Wales 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
Yeah I watched your video. Difficult to tell but I thought it sounded a bit rubbery? What engine is it? > 110 XS Double Cab
> Instagram @simonlanemind

Last edited by hank on 20th Oct 2020 9:28pm. Edited 1 time in total
Post #862571 20th Oct 2020 10:53am
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lohr500



Member Since: 14 Sep 2014
Location: Skipton
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United Kingdom 2013 Defender 110 Puma 2.2 XS CSW Santorini Black
It almost sounds like some sort of electrically driven servo motor. Is it an automatic box? Hard to tell from the video where the noise is coming from, but could it be some sort of gearbox interlock which locks the vehicle in Park until the ignition is switched on? Perhaps it has gone faulty and is only working when you press the start button the 1st time. Complete guess and based on zero knowledge of the vehicle !!
Post #862621 20th Oct 2020 5:05pm
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Angus_Beef



Member Since: 30 Apr 2015
Location: Oslo
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Norway 2015 Defender 110 Puma 2.2 SW Corris Grey
kind of sounds like those electric parking brakes Roaming around 🇳🇴🇨🇭
Post #862623 20th Oct 2020 5:16pm
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Angus_Beef



Member Since: 30 Apr 2015
Location: Oslo
Posts: 434
Norway 2015 Defender 110 Puma 2.2 SW Corris Grey
Are you depressing the brake pedal on the first push? Roaming around 🇳🇴🇨🇭
Post #862628 20th Oct 2020 5:40pm
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Liam Murphy



Member Since: 29 Jul 2020
Location: South Wales
Posts: 92
United Kingdom 2009 Defender 110 2.5 TD HT Tamar Blue
lohr500 wrote:
It almost sounds like some sort of electrically driven servo motor. Is it an automatic box? Hard to tell from the video where the noise is coming from, but could it be some sort of gearbox interlock which locks the vehicle in Park until the ignition is switched on? Perhaps it has gone faulty and is only working when you press the start button the 1st time. Complete guess and based on zero knowledge of the vehicle !!


Hi thanks for this!

It's a manual gearbox on a 318d 2007 engine
Post #862648 20th Oct 2020 7:29pm
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Liam Murphy



Member Since: 29 Jul 2020
Location: South Wales
Posts: 92
United Kingdom 2009 Defender 110 2.5 TD HT Tamar Blue
hank wrote:
Yeah I watched your video. Difficult to tell but I thought it sounded a bit rubbery? What engine is it?

I wonder whether the ECU will only allow startup if it sees voltage from the alternator. If the alternator tensioner is dodgy allowing the belt to slip then perhaps the ECU is detecting low voltage and the won't allow start. Don't know just a thought


I tried to get another video with the bonnet open but guess what? It started first time. It's so difficult to capture! But once it starts on the first go, it starts first time every time until it sits for a while.

It's a manual 318d 2007 3 series btw.

Thanks for the help, will try taking another look tomorrow.
Post #862649 20th Oct 2020 7:37pm
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Liam Murphy



Member Since: 29 Jul 2020
Location: South Wales
Posts: 92
United Kingdom 2009 Defender 110 2.5 TD HT Tamar Blue
DeeEss wrote:
Are you depressing the brake pedal on the first push?


Thanks! I'm depressing the clutch as this one is a manual.
Post #862650 20th Oct 2020 7:38pm
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lohr500



Member Since: 14 Sep 2014
Location: Skipton
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United Kingdom 2013 Defender 110 Puma 2.2 XS CSW Santorini Black
Oh well, bang goes my theory!!!
Post #862651 20th Oct 2020 7:38pm
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Liam Murphy



Member Since: 29 Jul 2020
Location: South Wales
Posts: 92
United Kingdom 2009 Defender 110 2.5 TD HT Tamar Blue
Haha! Thanks though, I appreciate it. Should have given more details on my car first...
Post #862653 20th Oct 2020 7:40pm
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hank



Member Since: 12 Sep 2016
Location: South Wales
Posts: 2224
Wales 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
edit: thought it might be exhaust actuator flap but the noise is different and also after the engine starts. Unless it sounds different form inside the car?

https://f30.bimmerpost.com/forums/showthread.php?t=705415 > 110 XS Double Cab
> Instagram @simonlanemind
Post #862684 20th Oct 2020 9:22pm
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