Thread: MSD 72lb injector help. -- Injectors bad or tune?

I just hope my ECU isn't fried :/

I have a DSM resistor box laying around if you want it. @gomba

I checked all the wiring and everything is wired up right. Well, at least uniform.

what happens if one of the resistors stops working? Will the injector go into a 100% cycle state?

Just put a resistor box on there eff those individual resistors

What cars can I get a resistor box off of at a junkyard? Or could I get it locally at an electronics supply shop? What exactly do I need?

Also, I figured out the problem...one or all of the injectors is dumping WAAYYY too much fuel. I pulled the dip stick and it reeked of fuel..pulled the spark plugs and there was fuel sitting on top of one of the cylinders! wtf would cause this? I already changed the oil, but am worried about starting the car up again like this. It's like some of the injectors has gone into a 100% on state. I know it's not the tune, I put the Calum base tune for my setup on there.

I checked for continuity on the injectors and they are all reading about 2ohms, so no chance they are 50lb injectors. I next unplugged the injector harness and checked for continuity between the injector clips and the injector hanress plug and they are all reading through. I noticed all the, I guess ground side, go to one pin on the injector harness plug.

So with that information, I'm trying to figure out what's going on. Perhaps the tune is waaayy too rich? The other idea was that maybe an injector is bad and leaking fuel or malfunctioning somehow? How would I check that?

You can check them by moving the injector that is in question to the next cylinder and see if the over fueling problem follows that injector. Injectors ran well for me and the resistors are brand new straight from JWT. I was running a JWT ECU with this.

Ya all the wiring and resistors seems to check out, it's now just down to the injectors or the tune. I'm going to try and test out the injectors just to make sure there's nothing wrong w/them and then lean out the tune if that checks out. My wideband showed no reading but it was probably so rich it was below the threshold of 10.0:1

Check this out..seems like an interesting idea to test:

I used to make really nice resistor boxes a while back. I could make one for you down the road if you want to go that route. It is super clean and includes all the wires you need. My setup allows for the box to be plug and play, and if you want to move back to standard injectors, you just undo the plugs at both ends of the box and then plug them back into the harness. I hope you get this worked out. Also, are you absolutely sure you have the plugs on the right injectors?