MS2 Injectors drivers might stay on after shutdown?

[Challenger]

So I was reading through the megamanual and noticed that they said..

 

"You must use a "main relay' that supplies both the injectors and your MegaSquirt® controller, as shown in the external wiring diagram above. When your MegaSquirt® controller shuts down, the injector driver states are 'indeterminate' and might allow current to flow through the injectors. Thus the injectors might stay open and flood the engine if the MegaSquirt® controller isn't powered but the injectors are powered."

 

Right now the wiring is set up to have the power to the ECU come from the battery (to minimize noise) through a toggle switch and relay. The injectors are getting power from the stock harness and dropping resistors, I just ran the original grounding wires to the db37. Given what it says above I think there may be a problem in the event I shut down the car and fuel continues to flow...

 

Has anyone had problems like this and what would be the reccomendations for changing wiring?

 

Car is a 78 280z, I dont have the ECU yet, I am finishing the wiring first before I buy it.

 

Thanks

[Sam280Z]

See if there is voltage at the injector with the ignition off. If not, you are good.

Looking at the wiring diagram, it appears that this is the case. The injectors get power from the Electronic Fuel Injection Main Relay.

 

 

Sam

[BLOZ UP]

I used the OE EFI relay and it powers the injectors only when the ignition is on.

Edited November 18, 2011 by BLOZ UP

[Challenger]

Oh yeah, didnt even think of that! Thanks.

 

Issue is fixed. Start signal wire that goes to the EFI main relay is turned on anytime the ECU is. ECU off = injectors off.

Edited November 19, 2011 by Challenger