posted on my350z, but wanted to get some opinions over here. Here's a breif overview of the progress:
(4 days ago)
So started my car this morning after it was running just fine yesterday, and it's def not running on all cylinders... so i'm gonna replace the spark plugs since i just got em in anyway, and then if that doesnt work, the coil packs.. but the problem is, it's not throwing a code. no light what so ever...

could it be my injectors? i have the greddy 440s in it with the vortech set up..

the symptoms: bogging sound at acceleration, rough (shaky at idle), and def huge loss of power, i know what it sounds like when a car doesnt run on all cylinders, that's def what it's doing, does anyone have any ideas?

(yesterday)
okay so here's the deal. replaced the spark plugs, no luck.. so we decided to unplug each coil seperately. all 3 on bank 1 were good, 4th cylinder good, 5 and 6 werent effecting the performance, another words, they werent functioning. so my issue is 2 of the cylinders are not performing.. coil packs are good cause we moved them around and they are working.

so next week when i get back from outta town, we're gonna check the injectors, which are 440cc greddys... but why would both cylinders not work?

no roughness at idle, it's perfectly smooth, just runs lack of pwer and groggy.

So any help would be great guys, any ideas.
BTW, I have UTEC.

 

Try unpluggin the utec (but don't boost) see if that gets some spark on those cylinders.

 

unplugging as in physically unplugging it or hooking up my laptop or something? i didnt install it, so i'm very clueless on it..

 

^^ physically remove it. Pull the harness off of it and plug it into the factory ECU. It might run a little rough (rich) but you should be hittin all cylinders when you give it some gas if the UTEC is causing your issues. Just don't boost without the UTEC.

 

yeah so i bypassed the utec, completely unplugged it, plugged stock ecu back, no change...

unplugged the battery, plugged it back in, and still no luck

wtf!?

 

gotta be either spark or injectors. I was hoping it was something simple like the utec...

 

I know you already checked, but damn does this sound like a bad coil. I'd have to guess it is injector related. Seeing as how you have troubleshooted most other common problems.

 

well now i'm being told by some other people my ECU itself might have gone bad... anyone wanna let me use their stock ECU for a sec?

 

Get it scanned for free at pepboys or autozone and let us know what dtc code popped up.

 

If it were electrical (even the UTEC) you would be getting a misfire code for the two affected cylinders. If it is an injector problem resulting in no fuel in those cylinders, the ECU would not be aware of the missing fuel (IE - no code). My vote is for an injector problem. Hard to believe they could be plugged though, the holes for output on the 440s are #$@ huge.

 

check compression.