INJ 1 and 2 always grounded out?

[jimbo5670]

so here is my predicimant,

 

I have a wire running from switchable power to one wire on all of the injectors, and 3 inj hooked up to each INJ wire off of the MS (2.2), every time i switch it on, the injectors open up and dump gas, not closing. They flood the cyl with fuel

 

i thought perhaps it was the wiring, so i pulled on injector and wired it the same way individually, and the same thing happened, the INJ wire is grounding out all of the time.

 

did something in the megasquirt fry, or am i just overlooking something

 

thanks guys,

matt

[z-ya]

It sounds like the FET driver (IXDI404PI-ND) in the MS is damaged. I've had this happen before. Swap in a new one.

[mario_82_ZXT]

You can be pinching/shorting out one of the wires.

 

We had that issue with my dad's Z, the DB37 connector was pinching a sensor wire and it was behaving screwy. You could be grounding out a wire causing it to squirt fuel.

 

Check continuity to ground.

Mario

[niner11]

Jimbo, I had a similar problem that caused my FET injector drivers to fail. It was only one but it dumped enough fuel to hydro the cylinders in short order. I was able to trace down the problem using very low value fuses for the injector circuit. Something like 2.5 or so.

 

BTW, it was easy to spot a short of the injectors using the stim board because the injector lights stop blinking.

[jimbo5670]

ok, that does make sence because that same thing as happened my MS box before. in a fit of blind rage last night however i bought a preassembled 3.0 pcb, haha, so hopefully with the voltage protection on the new board will hold up better.

 

take 'er easy,

matt