[Diy_efi] Injectors Not Firing TESTER

Wed Oct 11 03:32:45 UTC 2006

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
>> >> >
>> >>
>> >> _______________________________________________
>> >> 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
>> >>
>> >> _______________________________________________
>> >> 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
>> >> _______________________________________________
>> >> 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
>> >>
>> >>
>> >> _______________________________________________
>> >> 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
>> >>
>> >
>> > _______________________________________________
>> > 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
>>
>> _______________________________________________
>> 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
> -- 
> "Each new law makes only a single guarantee. It will create new
> criminals."-- John Tandervold
>
> _______________________________________________
> 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