Installing Injector pig tails

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andy
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Installing Injector pig tails

Post by andy » Sat Feb 03, 2018 12:01 pm

I am in the middle of helping a friend replace his fuel injector connectors.
My plan was to solder the pig tails in then use heat shrink to insulate the splice.

Last night I was unable to get the wire to take solder. Copious amounts of flux made no difference, the wire simply appears to have an aversion to solder.

Has anyone else experienced this? We have crimp on splices but I really was hoping to avoid them to have a cleaner more factory look when the job was done.

I really am not a fan of the bulges created by the crimp on splices.

Any advice?

Thanks!
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Re: Installing Injector pig tails

Post by Bedilion » Sat Feb 03, 2018 1:38 pm

Just for fun, try this.
Tighten the screws on your soldering gun, where the copper tip connects.
Then buff up the working end with a wire brush, or wire wheel.
Do some practice soldering on some spare wire ends.
Works for me, SB.
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andy
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Re: Installing Injector pig tails

Post by andy » Sat Feb 03, 2018 1:54 pm

Those are great suggestions Steve, but not the issue.
I’m using a gun not a pencil style soldering iron.
The tip gets red hot.
The wire on the pigtails won’t take the solder.
It looks like copper, but must be some alloy that repels solder?
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Re: Installing Injector pig tails

Post by fiatrn » Sat Feb 03, 2018 2:52 pm

I think that IF it would take solder, you might not WANT to use solder there anyway. The brittleness of solder, the heat in that area, and th vibration from the engine could make the solder fail.

I would explore alternate means of attachment - redoing a longer piece of wiring harness, finding an elegant way to splice, etc.
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Re: Installing Injector pig tails

Post by bnam2 » Sat Feb 03, 2018 7:18 pm

I’ve bought the insulated tube shaped butt connector, removed the outside plastic insulation and crimped the 2 ends usIng only the inner metal tube. Then put heat shrink over it.
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Re: Installing Injector pig tails

Post by bartigue » Sat Feb 03, 2018 8:25 pm

I use non insulated butt connectors, heat shrink over both, then heat shrink over the entire thing. It looks stock and is far better than those blue and red plastic crimps.
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Brad Artigue
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1970, 1979, 1980, 1981, 1982 124 Spiders -- 1969, 1970 850 Spiders -- 77 X1/9
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Re: Installing Injector pig tails

Post by andy » Mon Feb 05, 2018 11:04 am

Thanks for the advice!

I had not thought about soldering being a problem, I figured it would be the best method.

We did end up using butt connectors, when the heat shrink was heated up it looked better than I expected. We ran out of time to get everything plugged back in and tested. Hopefully that will happen this evenig.

The connectors and harness look great, a vast improvment over the old tired brittle stuff that was there.
Anyone considering this job, good luck finding boots for the 3-wire connectors for Throttle Position and Alitude Ssensor (if equiped), we ended up making boots from the 1" heat shink tubing and a zip tie. Probably not as elegant as a boot but better than nothing. The Throttle Position specidfically needs some strain relief.
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Boots

Post by cjwaters » Mon Feb 05, 2018 11:40 pm

Look for AMP Junior Power Timer boots. Also, it looks like AMP uses the same (or similar) boots on their newer Superseal connectors. Dig up the right PNs and you can get most Tyco/AMP stuff through Mouser and Digikey (among others). But to save some effort:

One source:
http://www.eagleday.com/ampcobo.html

Good info from the Porche contingent:
http://forums.pelicanparts.com/porsche- ... ctors.html

In the UK:
http://polevolt.co.uk/acatalog/Junior_P ... ctors.html
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Re: Installing Injector pig tails

Post by bartigue » Tue Feb 06, 2018 6:36 am

Post some pics of your work!
-----------------------------------------------------------
Brad Artigue
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Re: Installing Injector pig tails

Post by andy » Wed Feb 07, 2018 8:59 am

Sadly I didn't think about pics until we were done, so this is the best we can do.
2018-02-06 17.26.05.jpg
2018-02-06 17.26.05.jpg (2.22 MiB) Viewed 575 times
Andy Jossy
Medford, Oregon
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