First off thanks to anyone who can help me out with this one, I am starting to get very frustrated, to the point of where someone is gonna get a great deal on a misfiring supercharged Z! Onto the problem...

Over this winter I installed a Vortech SC w/3.33 pulley, Walbro 255, RC 550's, and UTEC. Upon first firing this spring, I found out that my #3 Cylinder was dead, so I pulled the motor apart and moved the #3 injector to the #2 cylinder, and the miss followed the injector. Sent it back to RC for testing and they said yea, definitely a bad injector, and I bought a new one. Swithched out plugs again, put the NEW injector in #2 cylinder, and started it up again. Seemed to run ok for 30 seconds, then pop..pop...pop..damn. Pulled the #2 coil, and it didn't affect how the car ran, so that means #2 is crap again. I tore the motor apart again, and moved the (new) #2 injector BACK to the #3 cylinder, and the miss again, followed the injector. I've put in new plugs, switched the coils around, and narrowed it down to the injector.

So my question is, am I just this just incredibly unfortunate that I got 2 crappy RC injectors in a row, or is there something wrong, thats "eating" my injectors in those 2 cylinders?

Any help is GREATLY appreciated...I don't understand what is going on here.

-Thanks,
Craig

 

I checked the resistance of the injectors and all 6 read 12.6ohms.

Also, the miss is noticeable at idle, you hear a defined pop, and under load while driving it sounds horrible, about like a WRX. Yet when I just rev in neutral, it seems to sound fine?

 

sure its missing right? not something else...i kinda thought something like this was going on and mine ended up being a clogged cat...i too am supercharged
my car sounded like a wrx or somethin while driving but revved and everything fine never threw a code
are u throwing a code all of a sudden or ever before?if so what is it

 

It is throwing a PO300, which is Random Missfire, but that is the only one.

I'm 99.9% sure it's a miss, because I can unplug the coil from the suspected missing cylinder, and it doesn't affect the idle of the car.

A plugged cat would give me a good excuse for HFC's though

 

lol...true dat...yeah if u can pull a plug or coil and it doesnt affect it then thats not it..idk man..good luck

 

hehe, thanks! This is starting to get frustrating, so close..yet so far.