[Diy_efi] Injectors Not Firing TESTER

Wed Oct 11 02:41:09 UTC 2006

I meant 'any' clocking source - the key is you don't want to smoke the
injector by keeping the 'on' period very long - I think they are rated
in milliseconds in that area.

On Tue, 2006-10-10 at 19:34 -0700, Steven P. Donegan wrote:
> This should help:
> 
> http://www.solorb.com/elect/solarcirc/pwm1/
> 
> Basically and 'clocking' source applied where R9 is in the circuit
> (meaning you can ditch the entire left hand side of the diagram) drives
> the FET... A morph of that subset is exactly what will be in my EFI
> project when I get to that part...
> 
> 
> 
> On Tue, 2006-10-10 at 21:18 -0500, Clair Davis wrote:
> > 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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