Possible Ignition Suppression Resistor Problem?

[2literbeatsV8]

So my 2g Talon TSi AWD snapped a timing belt this spring. Had the head rebuilt to stock specs, put it all back together, worked a few bugs out and she ran great. For a week and a half. Woke up one morning after putting just over 200 miles on the rebuilt head, started it up and it ran like a turd. Misfiring like crazy, couldn't keep it running, the whole nine yards. Then it refused to start at all. Thought it might be low compression but the car would randomly lose all electrical power in everything (radio, dash, everything). Went through many headaches trying to troubleshoot the issue, from the main ground cable to a new alternator to new fuses, came up with nothing. Still wouldn't start. It sat all summer (very sad, I know) and I finally got a second job at Belle Tire and one of my coworkers, a technician, agreed to work on it for me and figure out the issue. We pushed it in tonight and he got to work. He pulled the plugs out, looked like brand new. He had me crank it over with the plugs out and only cylinders 1 and 2 sprayed fuel out of the plug holes. We searched through the wiring diagrams and found the injectors get their pulse from the ignition suppression resistor. Someone over on DSMTalk asked a similar question (question about Ignition Suppression Resistor (Fuel Injector Resistor Box) - DSM Forums: Mitsubishi Eclipse, Plymouth Laser, and Eagle Talon Forum: DSMtalk.com) and I'm wondering if anyone here knows much about this component. If it goes bad, will it cause only the first two injectors to pulse? And would that have any connection to my losing power all throughout the car? I'm great with all things mechanical but when it comes to electrical issues, I'm Stevie Wonder in a windowless room with the lights off.

 

[wrencher]

I dont know if this will help, but I know what I deal with on a daily basis @ work & how I diagnose them.
The DSM's need the fuel injector resistor to supply power to the fuel injectors.
Our cars use a low impedance injector. Those injector designs ( low resistance) will draw high amperage during operation.
The resistor pack is a current limiting device in the injector circuit.

Check all the injectors for power, even while running or attempting to run, to make sure you have a voltage supply to the injectors at rest & under operation.
Possible 2 injectors are un-powered by a bad resistor pack.
If 3 & 4 are not powered & 1/2 are, the pack is the likely culprit.

The other end of the circuit is the injector driver in the ECU.
Those ground the injector to activate it.

I usually use an oscilloscope to test these kinds of circuits, but I understand it's not a common tool .

If you have a noid light & a volt meter you can likely figure this out.

Edit; the resistor pack will not affect the loss of power elsewhere in the car your suffering.

 

[2literbeatsV8]

Could the ground at the ECU be bad causing the power failure? I'm going to test the resistor packs tomorrow to see if they are bad. I'm assuming there are two separate packs?

 

[wrencher]

Could the ground at the ECU be bad causing the power failure? I'm going to test the resistor packs tomorrow to see if they are bad. I'm assuming there are two separate packs?

It's possible but I'd think it affect all the injectors, not just 2?
Test & see what is lacking first then go from there.

 

[2literbeatsV8]

Okay, so I pulled the resistor pack off tonight after work. Do you know how to test it? Would I just hook up a positive lead to the center prong of the plug and then test all four other prongs looking for ~2/3 ohms? Also, I would just like to say that thing is a pain in the poop deck to remove...

 

[Charlie90GST]

where is the resistor pack located?