[Diy_efi] Injectors Not Firing TESTER

Wed Oct 11 03:41:40 UTC 2006

Already did to the list: http://www.solorb.com/elect/solarcirc/pwm1/

Not my schematic - my equivalent is on my (ugh) Windows box at the
office and is stripped down to just the essentials for firing injectors
at any duty load possible - being me the FET's in my mod can handle 65
AMPS - far beyond anything needed but then they should run effectively
cold and 'never' fry :-)

On Wed, 2006-10-11 at 13:02 +0930, mark krawczuk wrote:
> hi,  could u email me the schematic : krawczuk at dodo.com.au
> 
> thanks,
> mark k
> ----- Original Message ----- 
> From: "Steven P. Donegan" <steve at donegan.org>
> To: <diy_efi at diy-efi.org>
> Sent: Wednesday, October 11, 2006 12:47 PM
> Subject: Re: [Diy_efi] Injectors Not Firing TESTER
> 
> 
> > 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.
> >> >> > _______________________________________________
> >> >> > Diy_efi mailing list
> >> >> > Diy_efi at diy-efi.org
> >> >> > Subscribe: http://lists.diy-efi.org/mailman/listinfo/diy_efi
> >> >> > Main WWW page:  http://www.diy-efi.org/diy_efi
> >> >> >
> >> >>
> >> >> _______________________________________________
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> >> >>
> >> >> _______________________________________________
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> >> >>
> >> >>
> >> >> _______________________________________________
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> >> >>
> >> >
> >> > _______________________________________________
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> >>
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> > -- 
> > "Each new law makes only a single guarantee. It will create new
> > criminals."-- John Tandervold
> >
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"Each new law makes only a single guarantee. It will create new
criminals."-- John Tandervold