[Diy_efi] The so called "Noid" lights ?

Mon Sep 10 04:17:42 UTC 2007

Mike,

(I am not an electronics expert - you may want check this with someone who
knows which end of the soldering iron to hold.)

It is probable that the injector drive circuit can source the extra current
to drive the LED while it is also driving the injector.  So using a LED in
parallel to the injector is probably OK.

I believe that you want to put a current limiting resistor in series with
the LED to avoid burning out the LED.

Bobby

On 9/9/07, Mike <niche at iinet.net.au> wrote:
>
> Thanks for the comments guys,
>
> It probably would help if I explained the reason I raised the subject.
>
> These days modern electronics can be quite sophisticated, small and low
> cost,
>
> It should therefore be possible to design a "smart" noid light which does
> the very least such as:-
>
> a. Be "inline" with the drive to the injector to observe simultaneous
> operation.
> b. Have it show polarity is the same on all injectors (assuming all 6 are
> wired correctly)
>   in situations where people build up looms and/or wishing to avoid
> polarisation if that is an issue.
> c. Have it indicate whether the injector has a shorted turn.
>
> I dont need a Noid light for myself, though it might be a handy tool to
> leave in the box.
>
> Its raised my interest how people swear by them on the forum I listed yet,
> to me, they
> seem very simple dumb devices and for the price I would have expected a
> little more.
>
> These days with LEDs using so little current (in comparison with the
> injector) it shouldnt
> be necessary to worry about the injector resistance and just wire in a
> light in parallel in
> some type of inline connector arrangement.
>
> Of course the electronics can be cheap and low cost even for a little
> sophistication
> but it seems the packaging and presentation can still be a pain and I
> guess this is a stumbling
> block...
>
> Thanks for the link to etoolcart but so far, that is the only one I have
> found even from the calaisturbo
> site, there just dont seem to be any other people doing them on a
> commercial basis anywhere,
>
> Thanks
>
> Mike
>
>
>
>
>
>
> At 10:36 AM 9/10/07, you wrote:
> >Mike,
> >
> >I made one - I measured the resistance of the injector - then a small
> light
> >- I added resistors to make the resistance similar.  I wired it in in
> place
> >of the injector.  It seemed to work - it would light up about when I
> thought
> >it it should.
> >
> >It seemed to work - but I never got the car running - so I'm not sure
> this
> >is a good idea.
> >
> >Bobby
> >
> >On 9/9/07, Mike <niche at iinet.net.au> wrote:
> >>
> >> Over here in Oz, a "Noid" light seems to be just a simple LED
> >> which goes in parallel with the injector, its a tool to verify the ECU
> >> is driving its injector output and that the signal is getting as far
> >> as the injector, ie All the way through the loom.
> >>
> >> You basically, unplug the injector connector and plug in the Noid
> >> light intot he injector and the injector connector into the noid so
> >> the noid is "inline" to the injector, when the injector is driven the
> >> light is supposed to come on.
> >>
> >> My question is,
> >>
> >> Is this just a basic light or are there any inline type testers like
> this
> >> that
> >> are any more sophisticated ?
> >>
> >> I'm not complicating this at present with any Duty cycle issues, just
> >> wishing
> >> to find out if people are using anything more sophisticated than a
> simple
> >> LED for their inline injector testing ?
> >>
> >> Regards
> >>
> >> Mike
> >>
> >>
> >>
> >>
> >>
> >> At 02:35 AM 9/10/07, you wrote:
> >> >Im not exactly sure what you are looking for, but this little tester
> is
> >> very
> >> >cool.  Its a dual led test light.  Magnetic pickups can light the leds
> in
> >> >this.  Its a pretty helpful little test light.
> >> >http://www.etoolcart.com/index.asp?PageAction=VIEWPROD&ProdID=248
> >> >
> >> >You could try searching "injector pulse width meter" Not too much
> comes
> >> up
> >> >but i think this is more what your lookin for. Besides these, i cant
> >> think
> >> >of anything besides an oscilloscope.
> >> >
> >> >On 9/9/07, Mike <niche at iinet.net.au> wrote:
> >> >>
> >> >> Hi chaps,
> >> >>
> >> >> Nice to see some activity here re logging, a subject in itself, I
> have
> >> >> idea for small cheapie
> >> >> logger and finally pinned down an enclosure/connector combo, but its
> >> not
> >> >> USB, just serial
> >> >> but would work for the most part with the cheapie usb to serial
> >> >> adaptors...
> >> >>
> >> >> Anyway, i digress...
> >> >>
> >> >> I'm on http://www.calaisturbo.com.au  from time to time as "Niche" -
> >> funny
> >> >> that...!
> >> >>
> >> >> And some people use "Noid" lights to test they have drive to the
> >> >> injectors, which is (as far
> >> >> as I understand) just a LED light in a moulding which is pluggable
> >> inline
> >> >> with the loom
> >> >> to the injector at the actual injector. So you can see it blink when
> >> >> cranking etc...
> >> >>
> >> >> I'm interested to know if anyone has a "noid" like type tester or
> item
> >> >> which does any more
> >> >> than just light up an LED when the driver wants to turn on the
> injector
> >> ?
> >> >>
> >> >>
> >> >>
> >> >>
> >> >> Regards from
> >> >>
> >> >>
> >> >> Mike
> >> >> Perth, Western Australia
> >> >> VK/VL Commodore Fuse Rail panel that wont warp, twist or melt,
> >> >> guaranteed  !
> >> >> Twin tyres for most sedans, trikes and motorcycle sidecars
> >> >> http://niche.iinet.net.au
> >> >> _______________________________________________
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> >> >>
> >> >_______________________________________________
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> >>
> >>
> >>
> >> Regards from
> >>
> >>
> >> Mike
> >> Perth, Western Australia
> >> VK/VL Commodore Fuse Rail panel that wont warp, twist or melt,
> >> guaranteed  !
> >> Twin tyres for most sedans, trikes and motorcycle sidecars
> >> http://niche.iinet.net.au
> >> _______________________________________________
> >> Diy_efi mailing list
> >> Diy_efi at diy-efi.org
> >> Subscribe: http://lists.diy-efi.org/mailman/listinfo/diy_efi
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> >>
> >
> >
> >
> >--
> >Toward freedom,
> >
> >Bobby Yates Emory
> >_______________________________________________
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-- 
Toward freedom,

Bobby Yates Emory