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Author Subject: Loom causing idling and misfire issues
sergioiacobucci

Senior User

Location: High Wycombe

Registered: 27 Nov 2007

Posts: 526

Status: Offline
Post #1
Hi all,

When doing the compression test yesterday I noticed that if i moved the wiring loom it immediately idled perfectly. This makes sense considering the issue i had at the end of the track day was sudden and the other things i have been doing to solve the issue havent really had an impact.

My loom doesnt look that great and I am talking about the section that runs near the air intake but low down, there is a bend in that sectiion.

Is this common and does anyone know what in particular I should look out for? Any suggestions other than just get down there and take a look?

Cheers

________________________________________

Phase 1 silver track car
335i daily
Posted 28th Nov 2016 at 07:16
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ale624

Regular

Location: bristol

Registered: 02 May 2016

Posts: 173

Status: Offline
Post #2
No idea if this is common or not, but some general loom diagnostics advice:

if when you are moving the loom it gets better, try and pinpoint the section (to around 5-10cm) if you can just by poking it.

once you've narrowed it down a bit, strip off the tape/shielding and have a look for any exposed bare wire, any obvious nics or odd looking bends. you can also try wiggling individual wires around in the loom if there is nothing obvious.

once you find the wire/wires causing your problem, chop out the bit of broken wire (~3cm each side of the break) and solder in a new section, make sure you use heat-shrink tubing to seal it back up!

make sure you wrap it back up in either the original shielding or some electrical tape!
Posted 28th Nov 2016 at 11:21
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sergioiacobucci

Senior User

Location: High Wycombe

Registered: 27 Nov 2007

Posts: 526

Status: Offline
Post #3
ale624 wrote:
No idea if this is common or not, but some general loom diagnostics advice:

if when you are moving the loom it gets better, try and pinpoint the section (to around 5-10cm) if you can just by poking it.

once you've narrowed it down a bit, strip off the tape/shielding and have a look for any exposed bare wire, any obvious nics or odd looking bends. you can also try wiggling individual wires around in the loom if there is nothing obvious.

once you find the wire/wires causing your problem, chop out the bit of broken wire (~3cm each side of the break) and solder in a new section, make sure you use heat-shrink tubing to seal it back up!

make sure you wrap it back up in either the original shielding or some electrical tape!


Thank you very much for the tips!

________________________________________

Phase 1 silver track car
335i daily
Posted 28th Nov 2016 at 11:27
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ale624

Regular

Location: bristol

Registered: 02 May 2016

Posts: 173

Status: Offline
Post #4
sergioiacobucci wrote:
Thank you very much for the tips!

No worries, good luck!
they can be an arse to track down! at least you've got a good rough idea of where the problem is though!
Posted 28th Nov 2016 at 12:19
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fatlapit

Seasoned Pro

Location: STOCKSFIELD

Registered: 02 Nov 2010

Posts: 3,040

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Post #5
gonna go for crank sensor shielding breaking down, it happened to mine.

________________________________________


Posted 28th Nov 2016 at 12:23
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sergioiacobucci

Senior User

Location: High Wycombe

Registered: 27 Nov 2007

Posts: 526

Status: Offline
Post #6
fatlapit wrote:
gonna go for crank sensor shielding breaking down, it happened to mine.


Ok thanks - I'll take a look I am hoping its obvious!

________________________________________

Phase 1 silver track car
335i daily
Posted 28th Nov 2016 at 12:27
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welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,838

Status: Offline
Post #7
if wiggling the last bend causes it' it wont be the crank sensor, more likely to be corroded pins in the two round plugs.

crank sensor doesnt go round the last bends.

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Posted 28th Nov 2016 at 13:00
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sergioiacobucci

Senior User

Location: High Wycombe

Registered: 27 Nov 2007

Posts: 526

Status: Offline
Post #8
welshpug! wrote:
if wiggling the last bend causes it' it wont be the crank sensor, more likely to be corroded pins in the two round plugs.

crank sensor doesnt go round the last bends.


Thanks WP Thumbs up I'll have a look inside the connectors

________________________________________

Phase 1 silver track car
335i daily
Posted 28th Nov 2016 at 13:10
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mocinim

Seasoned Pro

Location: The Darkside of bedford :)

Registered: 09 Jan 2015

Posts: 2,307

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Post #9
Id also go for the connectors first check the pins for corrosion
Id also think about finding a replacement loom for the future

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Posted 28th Nov 2016 at 14:00
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sergioiacobucci

Senior User

Location: High Wycombe

Registered: 27 Nov 2007

Posts: 526

Status: Offline
Post #10
mocinim wrote:
Id also go for the connectors first check the pins for corrosion
Id also think about finding a replacement loom for the future


Yep seem one on ebay for £60 might be worth keeping in stock!

________________________________________

Phase 1 silver track car
335i daily
Posted 28th Nov 2016 at 17:19
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ale624

Regular

Location: bristol

Registered: 02 May 2016

Posts: 173

Status: Offline
Post #11
mocinim wrote:
Id also go for the connectors first check the pins for corrosion
Id also think about finding a replacement loom for the future

Yup, connectors are easy to check and fix! give the pins a scrape down with a lil screw driver or a little wire brush if you can get one in there.

having a spare loom is never a bad idea, but £60 seems a bit much for what is probably just a dodgy wire or connection Smile

Posted 28th Nov 2016 at 17:48
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RetroPug

Seasoned Pro

Location: Leicestershire

Registered: 15 Jan 2013

Posts: 2,473

Status: Offline
Post #12
sergioiacobucci wrote:
mocinim wrote:
Id also go for the connectors first check the pins for corrosion
Id also think about finding a replacement loom for the future


Yep seem one on ebay for £60 might be worth keeping in stock!


pug_306 (ryan) supplied me one for a much more reasonable price, he's worth a PM.

________________________________________

61k miles Ph.1 Diablo '6 Project Thread
Posted 30th Nov 2016 at 20:09
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mechanical_repairs

Seasoned Pro

Location: leicester

Registered: 10 Jan 2005

Posts: 12,122

Status: Offline
Post #13
I can do you a loom for £45 delivered.

Had them years so literally been in dry storage so in great condition.

Carl

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36 narborough road south, Leicester LE3 2fn

MOT station now open, tests £35 with a free retest.
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Posted 30th Nov 2016 at 20:21
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