Fw: Fw: [Diy_efi] More Analog diagnosis

[Lee M. Lemoine]

It'll indicate if your getting a pulse for sure, i think really your saying
it kind of 'wimpers' out sounds like the driver transistor overheating. I
never really played with that stuff in the fuel injector sense, however,
thats what happens with amateur radio equipment when the finals get
overdriven -- the output weakens and distorts til it shuts off (or burns
up)...

This also does sound typical of the primer pulse, which would be several
small pulses... (depending upon what kind of primer charge was needed to
fire the motor) however, if you've got access to an oscilioscope, that'd
reveal your answers for sure.

--LL


On 10/12/05, Geoff Harrison <geoff_h at smartchat.net.au> wrote:
>
> Good point. I assumed being an older unit would be designed for low
> impedance, therefore assumed would drive a noid light, which would have a
> very low cold resistance, where as the injector has inductance.
>
> Several manuals I have seen describe the use of noid lights for testing
> injector wiring and ECM pulses while cranking. Are they all wrong?
> I suppose it depends on the wattage of the noid light.
>
> Geoff
> ----- Original Message -----
> From: "Lee M. Lemoine" <llemoine at gmail.com>
> To: <diy_efi at diy-efi.org>
> Sent: Thursday, October 13, 2005 11:37 AM
> Subject: Re: Fw: [Diy_efi] More Analog diagnosis
>
>
> was thinking similar, high impeadance on low impeadance.
>
> On 10/12/05, Djfreggens at aol.com <Djfreggens at aol.com> wrote:
> >
> > In a message dated 10/12/2005 9:33:23 P.M. Eastern Standard Time,
> > geoff_h at smartchat.net.au writes:
> >
> > Joe Boucher wrote on Oct 13 2005
> >
> >
> > There is a small chance someone may remember I have an
> > older analog EFI unit I bought at a swap meet. After
> > some fangling with it, it is functioning except for
> > one thing.
> > I put some noid lights in place of the injectors. I
> > would switch power to the unit and the lights would
> > start flickering as they should, then over about 2
> > seconds, the light intensity would die untill the
> > lights went out. This happened every time I cycled
> > the power.
> >
> > My thought is something in the power supply is bad as
> > the effect is the same for all the injectors.
> >
> > I don't have a schematic. There are one set of
> > components for each injector except there is one power
> > transistor and capacitor all by themselves.
> >
> > Thanks,
> >
> > Joe
> >
> > have you considered the fact that noid lights present very high current
> > loads to the ecm. in fact there not recomeneded for diagnosing injector
> > switching. best thing to use is a real injector of the correct design.
> >
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> >
> >
> >
>
>
> --
> Sincerely,
>
> Lee M. Lemoine
> http://www.turbochargedsoul.com/
>
>
>
>
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>
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--
Sincerely,

Lee M. Lemoine
http://www.turbochargedsoul.com/
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