E8x MAF sensor wire, repair/replace/?

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Autosri
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Re: E8x MAF sensor wire, repair/replace/?

Post by Autosri » Thu Jan 10, 2019 11:07 pm

Personaly not a fan of solder in car looms especially ones that are hanging in free air

Get some uninsulated through crimps/butt splices and some glue lined heat shrink tube and crimp them properly with some pliers

Get a set of cheap depin tools and pull the pins out and slide the glue lined shrink tube over the damaged insulation

You won’t fine solder joints in any factory looms anywhere at all all are cold weld/crimps

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Re: E8x MAF sensor wire, repair/replace/?

Post by Autosri » Thu Jan 10, 2019 11:12 pm


Mr Whippy
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Re: E8x MAF sensor wire, repair/replace/?

Post by Mr Whippy » Fri Jan 11, 2019 2:17 am

Bulk Amazon cancellation... let’s see how much arrives haha!


OK gone with butt and crimp, and pin keys, to re-insulate all wires with shrink wrap.


Some of the eBay China suppliers are slooo, so had to pay a bit more for pin keys and butts on Amazon but at least I can get the job done on Tuesday, not early February haha... I’m not sure I could live with an insulation tape fix for that long.


£30 this time. Would have been £6 cheaper using eBay for it all but hey ho.



After looking at many automotive wire ends, you’re right, all plug ends are just crimped.

Obviously a good crimp is key. Are those CK crimpers going to be any good? I guess practice on similar wire will be needed.
Plus glue shrink wrap should secure things further.

I just have nightmares of some weird intermittent running issue in a few years and it’s because of a dodgy crimp that I’ve forgotten about :)
130i LE - exhaust flap mod - ssk & bmwp & M3 gbox mounts - bmwp handbrake - bmwp steering surround - camber pin mod - cdv delete - koni SA & bmwp front bump & koni rear bump

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Re: E8x MAF sensor wire, repair/replace/?

Post by jason@bwchiptune » Fri Jan 11, 2019 4:54 am

I always solder the connections

All you need to do is extend your broken wire if needed
Solder the joints
Then use your shrink wrap glue on any open copper wires

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Mr Whippy
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Re: E8x MAF sensor wire, repair/replace/?

Post by Mr Whippy » Mon Jan 14, 2019 11:39 pm

Well I did a quick fix with leccy tape and twisted wires for now.

Car ran ok on drive as a test.

Went to drive today and idle hunting up/down lots until warmed a bit.

Then on way home after 10 mile drive out, cold engine again, hunting, engine outline light in yellow on dash, but no fault codes or running issues via iDrive/gauge readouts.

Drove on as it was otherwise fine, but noticed half way back home that I couldn’t heel and toe... brake would cut throttle input.

Apart from that it felt super smooth and solid as usual.

Arrived home, left car. Went back later. Still hunting at cold idle (1200-1000 rpm up/down)
Yellow engine outline light still present, no faults on readouts.



Weird.

I’m gonna have to get inpa sorted and read out the actual fault.

It seems really odd this has started after having airbox/pipe to manifold off while doing recce for and doing a quick fix.

I bet it’s the naff twisted connection I did on MAF wire, but why it’s not throwing a proper fault and stuff is bizarre.


Hmmmm.
130i LE - exhaust flap mod - ssk & bmwp & M3 gbox mounts - bmwp handbrake - bmwp steering surround - camber pin mod - cdv delete - koni SA & bmwp front bump & koni rear bump

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Re: E8x MAF sensor wire, repair/replace/?

Post by Mr Whippy » Sun Jan 20, 2019 2:49 pm

Well here is my quick tape fix.
Image

After my ‘issues’ above with running, I can’t be entirely sure, but I think I’d simply forgotten to plug the wire back (or it’d vibrated off) after getting the airbox etc refitted and bolted down.

Clearly the car can run ok on exhaust monitoring haha... just leaves an EML/MIL due to emissions not being optimal.



I removed all the stuff in the way again.
Image

Wire positions noted, and pins out.
Image

Even on these insulation splits, strands have been cut. I hope whoever did this doesn’t make a profession of working on cars!
Image

Working around all wires with 3:1 glue lined heat shrink.
Image

The cut wire, even on the insulation splits, is really messy with several cut strands.
Image

Butt crimp on split.
Image

And finished split wire.
Image

All done.
Image

Plug rebuilt and outer cover almost fitting over all the fixes.
Image


Given how buggered the cable seems, I’m now tempted to just get a spare loom end, cut back wires on my loom to good wire, crimp/solder at gapped intervals, and connect replacements from a good loom end, and go from there.


What a bloody faff. Clearly it was working ‘ok’ but it needed making good.

I still think it needs making right though. All those missing strands isn’t ideal.
130i LE - exhaust flap mod - ssk & bmwp & M3 gbox mounts - bmwp handbrake - bmwp steering surround - camber pin mod - cdv delete - koni SA & bmwp front bump & koni rear bump

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Re: E8x MAF sensor wire, repair/replace/?

Post by Octavius » Sun Jan 20, 2019 3:23 pm

still think it needs making right though. All those missing strands isn’t ideal.

They are signal wires so carry no load. A couple of broken strands should make no difference.
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Re: E8x MAF sensor wire, repair/replace/?

Post by Mr Whippy » Sun Jan 20, 2019 4:16 pm

I’ll be honest the technical side of it isn’t something I’ve looked at too much yet.


I think the MAF reads off with hot film so resistance based?
Constant voltage and a varying current drawn?

Having missing strands mid-way may make no net change to the resistance over the runs... then again a local hotter spot might?! A constant slightly higher resistance due to a higher temp?!

This is probably where I’ll have to do digging on the signal side of things to understand it better.



It’ll do for now until the water pump issue is resolved haha!
130i LE - exhaust flap mod - ssk & bmwp & M3 gbox mounts - bmwp handbrake - bmwp steering surround - camber pin mod - cdv delete - koni SA & bmwp front bump & koni rear bump

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Re: E8x MAF sensor wire, repair/replace/?

Post by Rarebit » Sun Jan 20, 2019 5:04 pm

Gutted for you Dave.

I never investigated this as the MAF was always working but does look like a tuning box or something has been fitted - not sure why on the n52 as the gains would be minimal? I am trying to think what else could have been fitted that would need a MAF signal?

I can't believe the waterpump has gone so soon too, I always felt like I was living on borrowed time with it but never had any codes or issues with it. It had the stat done not that long ago, so that should save a few quid. I hope you get it sorted without too much hassle!
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Mr Whippy
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Re: E8x MAF sensor wire, repair/replace/?

Post by Mr Whippy » Sun Jan 20, 2019 9:01 pm

Yeah it’s weird, I expected tuning box just needs one wire, but not to tap into a pair of others but not split them.

I’d also imagine most decent tuning boxes have a male/female plug the same as MAF or whatever, and just sit in-line.

Anyhow not a big issue really. Just annoyed I ran it unplugged as it’s caused myriad odd running/faults which now make it harder to understand this water pump failure issue.



I’d planned for doing the pump but was kinda talked out of it and thought I’d just see.

I wish I’d done it now as I’m kinda stuck with my preferred garage being 1hr and 35 miles away... and a knock at the front... worried one of these new shocks isn’t good as it was silent before.

Ahhhh cars haha.
130i LE - exhaust flap mod - ssk & bmwp & M3 gbox mounts - bmwp handbrake - bmwp steering surround - camber pin mod - cdv delete - koni SA & bmwp front bump & koni rear bump

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