When frankensteining my wire harness I put a Blaster 3 MSD coil in. Should those liquid filled can style work just as good as the solid state ones that are stock on an EFI? Or could this be causing the volt drain that won't allow the car to start with O2's plugged in? could this even cause a problem?
I would just check to see if the coil has power to it with the key off, If not thats not it, also if your O2's are draining the battery I would think that the relay is wired to a constant 12v, It should be connected to a run only source, or the ralay is shorted causing it to stay closed, hope this helps.
i guess i mistated. not draining the battery, but with em plugged i the coil only get 7v... not enough to kick a spark. with them disconnected the coil gets 10v... which don't seem right. should be ten. but I don't think the different styles of coils is my problem.. but then again i don't think often
you must have your wiring wrong. the coil supply voltage shouldnt drop from the o2s being hooked up. what i believe is happening is that the o2 heater circuit is drawing from the power wire to the coil. having 10 volts to the coil shows that you have the resistor wire going to the coil. i would suspect that the o2 heaters power is coming from this wire also. you need to put a relay on the o2 heaters power wire. they should be triggered from the ignition circuit before the resistor wire. if you switch to a modern coil you will want bypass the resistor wire.
