[Diy_efi] Injectors Not Firing TESTER

Wed Oct 11 03:12:33 UTC 2006

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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