Re: Trials and tribulations

["Bruce Plecan" <nacelp@bright.net>]

Far as I know it's all Packard Bell wire (least that's what they said in gm
courses).  I've taken numerous EFI harnesses apart (TBI + TPI).  On a few of
the TBIs the injector wiring seems to be tougher then the stuff in the
harness with it.  With age even gets worse, meaning brittle.  Had an 85
Buick turbo that the injector harness was really, really heavy duty in the
tough insulation department.  I think gm just sets a min, and if they run
out of that, then they get some of this tough stuff.  Oh, back to the 85,
and then I've taken one apart where it just appeared to be the normal
harness stuff.  The GM pickups seem to be the most common use of the tough
injector wiring.  If the whole harness end was brittle I'd say heat, but
when it's just the injectors, I say for some reason it's a toughter wire.
   Also, at Mendelson's from time to time the have a oil proof wire for
sale, that appears to be the injector tough stuff, I think it's just label
oil / heat resistant.  If it would help I might be able to round up samples
of both.
Grumpy


> >The TBI uses some killer
> >insulation on the wires to the injectors, apparently so it doesn't
> >melt with the exposure to the fuel. This makes it hard to splice
> >and easy to break the wires.
> Hmmm, not sure what that would be. Both PVC (80degC) and the higher temp
> polyethylene insulation (125degC) used on SAE J1128-rated automotive
> wire are naturally fuel/oil resistant. I take it from your description
> that it really does look like a different kinda wire? Anybody know what
> kinda wire that might be, or perhap it was just aged? Was the wire new
> or old, Bob?
> >After much time trouble-shooting a no-to-hard-start condition,
> >I found the injector wire splices broken. ...
> >The ends were still butt together, apparently the engine vibration
> >was enough to keep them touching so that once started, the
> >engine would run.
> Ho ho, good sluething! Gawd, I HATE intermittents, especially ones that
> hide under vibration. I can imagine how good you musta felt when you
> found out where that gremlin was hiding, and squished it. :)
> Gar


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