[Diy_efi] Injectors Not Firing...

[Charles Woock]

Power goes from the fuse to the injectors.  The ecm provides the ground. 
There is also a specific injector ground wire that comes out of the ecm. 
I'm not sure exactly about grounding the ecm case but I did.  Just to make 
sure.  If you have an old injector, you could plug it into the harness to 
check...

I know this is just the basics but hopefully it helps.

Charles

----- Original Message ----- 
From: "Clair Davis" <clair.davis at charter.net>
To: <diy_efi at diy-efi.org>
Sent: Sunday, October 08, 2006 8:51 PM
Subject: Re: [Diy_efi] Injectors Not Firing...


> DOH... perhaps I should mention that this is using a GM '7730 ECM...
>
>
> ----- Original Message ----- 
> From: "Clair Davis" <clair.davis at charter.net>
> To: "diy_efi" <diy_efi at diy-efi.org>
> Sent: Sunday, October 08, 2006 8:47 PM
> Subject: [Diy_efi] Injectors Not Firing...
>
>
>> Got everything to the point that I could try to fire the old Plymouth up
>> today.  Everything SEEMS to work, except the injectors.  No gas smell in
> the
>> tail pipes or intake, no flashing on the noid light, I'm guessing the
>> injectors aren't injecting.
>>
>> Here's what I know:
>> - #1 plug is firing on the early side of TDC
>> - spark is nice and regular (according to the timing light)
>> - there's over 40psi of fuel pressure at the regulator
>> - there's fuel in the rails
>> - the fuel pump relay is doing it's thing
>> - no fuses appear to be blown
>> - ECM is grounded to the engine block, and engine/chassis grounds are 
>> good
>>
>> Here's what I don't know:
>> - does the ECM case need to be grounded? (assuming not)
>>
>> I haven't hit my 1990 Camaro FSM yet, but I figured I'd better throw this
>> out to the masses anyway.  Anyone have a clue as to what's going on?  I
>> really think everything is pretty solid, from a wiring standpoint, and
> fuel
>> is obviously not an issue (other than the small leak at the pump, and the
>> fact that it's not getting in to the combustion chambers).
>>
>> Any help would be greatly appreciated!
>>
>> Clair
>>
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