distributor reference
on circuit #430 on 1227730 ecm,dist. ref when i apply 12v to circuit with the dist 4 way connector removed the injectors dont fire untill i remove the 12v is this correct or is it supposed to fire when i apply 12v?im having a wont run problem.

 

Year and model help as opposed to part numbers. Dist reference is a pulse generator so putting voltage on and off should cause injector operation.

 

i have a 1951 five window chevy truck that it is in.the first ecu was from a 87 vette 1227165 then i changed it over to a 1227730 from a 90 cavalier i reworked the wire harness.now i have changed it over to a 1227727 waterproof ecu from a lumina 91.i have aujp chip with vats removed.the vehicle ran fine with the 7730ecu but i cant get it to run with 7727?the plugs are fireing and the injectors as well.only #2 cilinder will fire off?in my swappers guide it said to check circuit #430 with power i wanted to know if it should pulse the injectors when 12v applied like the book said or when it was removed ,like mine is doing?i have tried a different 7727 and a new ignition module still just #2 every now and then.i have removed the plugs let the fuel off of them evaporate and then reinstalled them and still no difference.the distributor is from 87 vette with hei.

 

I just happen to have a Lumina 91 Z-34, let me pull the book and look it over at work. I'll get back to you if I can come up with some help.

 

I took a quick look at the diagram for the 91 and it looks very different. The 91 uses a crankshaft position sensor and opposed to dist hall pickups like the 89 I have uses. Both ECM's bank fire the injectors, I suspect it has something to do with the way the two sense injector pulsing and provide timing. Are you sure the 2 are compatible?

 

thanks i figured it out even though the diagram shows different colors for the ref and bypsss they are the same color and 430 should fire injectors when power is applied.thank you for your help.

 

My later GM manuals say ref ckt#430 is crankshaft position.