Fw: Fw: [Diy_efi] More Analog diagnosis

[Geoff Harrison]

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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