Just ran the active cylinder test with Torque Pro by shutting off each cylinder individually, and here's what happened;

1 Minimal RPM change
2 Minimal RPM change
3 Nearly died
4 Minimal RPM change
5 Nearly died
6 Nearly died


So I'm curious, it looks like I have three 'weak' cylinders...

Has anyone else done this test with slightly similar results? I'm not exactly sure where to start on this, perhaps plugs and looking over wiring might be good. The engine has about 30k. Perhaps a compression test would be telling as well...

Keep in mind this is an 08 altima swap, but all fuel management is stock for 2003.

 

Yes drive the car around a little bit then do a compression test and you'll know the truth story about the cylinders

 

Yeah compression test

 

Ok I finally got around to getting things tested.

I didn't test the rear cylinders, just the front three, so 2,4 and 6

CYL2,4,6: 120PSI

This is low per the FSM, but here in CO the altitude kills us. 120 is right about where it should be.

I swapped the injectors around, coil packs, and plugs to see if the symptom followed. Nothing followed.

I think this isolates this down to wiring perhaps? Anyone have any other ideas?

I shook the wiring around while it ran, and it didn't react at all. I'm pretty stumped.

 

You need to test all

 

Ok, I went and tested them all. All of them are 120 PSI with only 2psi difference between any of the cylinders, so we can probably rule that out.

The Test I ran originally was through Car Gauge Pro. Now I just went out and disconnected the coil packs while it was running and every cylinder I could get to changed the idle the exact same amount. I wonder if the app has a glitch or something? Maybe it's shutting off two cylinders instead of just one.

Everything seems to be checking out besides that app... false alarm perhaps.