[Diy_efi] Injectors Not Firing TESTER

[Steven P. Donegan]

The stuff in the schematic I forwarded cover little things like
flyback/kickback voltages from the injector coil, handling more current
than any likely injector will ever need without frying the circuit etc.
If I wasn't deep in other projects right now I'd do up a full test
circuit - perhaps later - I do like having test tools before building
the system itself :-)

On Wed, 2006-10-11 at 12:42 +0930, mark krawczuk wrote:
> hi, of the  top of my head, (without a gearbox on it......long story.)  in 
> back of dick smith catalog there is a simple schematic using a 555 timer , 
> all then u have to to is connect the  base of transistor to output of 555 , 
> then emiter to ground, tehn connect  injector thru  the collector to +12v , 
> sumthin like that ,  might pay to use a  fast switching type transistor , 
> and i think u have to put a resister in teh llinefrom 555 to base ?
> 
> sumthin like taht .
> 
> mark k]
> 
> 
> 
> 
> ----- Original Message ----- 
> From: "Clair Davis" <clair.davis at charter.net>
> To: <diy_efi at diy-efi.org>
> Sent: Wednesday, October 11, 2006 11:48 AM
> Subject: Re: [Diy_efi] Injectors Not Firing TESTER
> 
> 
> > I'd kind of like to see a schematic for that, too.  555's and trans/FET's
> > are BEYOND Greek to me...
> >
> > Clair
> >
> >
> > ----- Original Message ----- 
> > From: "Charles Woock" <atomic at extendwireless.net>
> > To: "Rick McLeod" <dunvegan at sbcglobal.net>; <diy_efi at diy-efi.org>
> > Sent: Tuesday, October 10, 2006 9:02 PM
> > Subject: Re: [Diy_efi] Injectors Not Firing TESTER
> >
> >
> >> Do you have a schematic for this or know where it is on the web?
> >>
> >> Thanks
> >>
> >>
> >> ----- Original Message ----- 
> >> From: "Rick McLeod" <dunvegan at sbcglobal.net>
> >> To: <diy_efi at diy-efi.org>
> >> Sent: Tuesday, October 10, 2006 11:18 AM
> >> Subject: Re: [Diy_efi] Injectors Not Firing...
> >>
> >>
> >> to test, build a quick and dirty injector testor w/ a 555 and a power
> >> trans/FET set up to slow rate pulse and hook up to the 'jector to see if
> > it
> >> squirts when the fuel log is presureized
> >>
> >>
> >>
> >>
> >> ----- Original Message ----
> >> From: Andrew Hopton <hoptona at gmail.com>
> >> To: diy_efi at diy-efi.org
> >> Sent: Monday, October 9, 2006 10:51:38 PM
> >> Subject: RE: [Diy_efi] Injectors Not Firing...
> >>
> >>
> >> Hi,
> >>
> >> Actually, 12v at both pins of the injector is good (provided eng is not
> >> running) - because your multimeter is at least 1MOhm (and probably
> >> 10MOhm) it provides no appreciable load, so you will measure 12v at both
> >> sides of the injector's internal coil (there will only be a voltage drop
> >> across the injector coil when current is actually flowing - i.e. when
> >> the ECM grounds the 'cold' side of the injector.
> >>
> >> By seeing 12v at both sides of the injector coil, you have proved the
> >> injector is not internally open-circuit (aka 'fried')
> >>
> >> Cheers,
> >>
> >> Hoppy.
> >>
> >> -----Original Message-----
> >> From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]
> >> On Behalf Of Clair Davis
> >> Sent: Tuesday, 10 October 2006 10:51 AM
> >> To: diy_efi at diy-efi.org
> >> Subject: Re: [Diy_efi] Injectors Not Firing...
> >>
> >>
> >> Update...
> >>
> >> OK, the multimeter says I've got 12V at BOTH pins on the injector...  Me
> >> thinks that's not so good, and probably not what VATS does.
> >>
> >> I also pulled the PROM out, mostly to verify to myself that I DID in
> >> fact have it in the box, and judging by the scribbles on the chip, the
> >> guy who programmed it probably DID do the right thing(s) with it.  I'll
> >> shoot him an email and see what he can dig up on the project.
> >>
> >> In the mean time, I've got to do some digging myself and see what I've
> >> done when hooking the system up.  There's NOT a separate wire for the
> >> injector power, so I'm thinking it is worked in to some other junction
> >> in the system. Time to go take some notes.
> >>
> >> Clair
> >>
> >>
> >> ----- Original Message ----- 
> >> From: "Marty Schmid" <marty67357 at yahoo.com>
> >> To: "Charles Woock" <atomic at extendwireless.net>; <diy_efi at diy-efi.org>
> >> Sent: Sunday, October 08, 2006 11:38 PM
> >> Subject: Re: [Diy_efi] Injectors Not Firing...
> >>
> >>
> >> > what prom are you using if it is camaro, moat likely vats has
> >> > dis-abled
> >> the injectors. you need to have a scan tool connected and look at the
> >> vats, is it enabled or disabled
> >> >
> >> > ---------------------------------
> >> > Talk is cheap. Use Yahoo! Messenger to make PC-to-Phone calls.  Great
> >> rates starting at 1?/min.
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> >>
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