Misfire readings on cylinder 8

[Mouse330]

check for 12 volts on the PK/BK wire KOEO
Ohm out the injector(spec from manufacture)
disable the fuel pump
use a noid light and crank the engine see if it blinks
The PCM supplies ground on the D-BL/WH wire

[Ed93]

Originally Posted by V1SIOUS5THGEN

So I’m picking up misfire readings on cylinder 8 watching misfire counter on snap-on scanner. I’ve swapped coil and wire to different cylinder but still showing misfire. Pulled old plug and it was black on tip. Added new colder plug and week later it’s black as well. What could be the issue? I have bigger injectors and Ecs supercharger plus cam

Turning over an old stone.
I am having the same issue with mine what was the verdict?
2015 Camaro SS LS3
P0308 misfire #8
Stabilitrak Code
Plug ✅
Wires (MSD) ✅
Swap coil 1-8 ✅
Fuel pressure ✅
Swap injector 1-8 ✅
Checked pushrod (visual) ✅
Valve Spring (visual) ✅
Deleted code every time ✅
Battery ✅

Always comes back to misfire # 8 and stablink code, every time.

Any ideas?

[Aqua Blue RS/SS]

Coil and injector wiring check out ok on cyl 8? Measured voltage in that wiring with a multi meter?

[Wizard1183]

Originally Posted by V1SIOUS5THGEN

So I’m picking up misfire readings on cylinder 8 watching misfire counter on snap-on scanner. I’ve swapped coil and wire to different cylinder but still showing misfire. Pulled old plug and it was black on tip. Added new colder plug and week later it’s black as well. What could be the issue? I have bigger injectors and Ecs supercharger plus cam

After plug swap it’s still misfiring?

Coil pack?

Also when did you swap to larger injectors? Have you ran it awhile with them in? Swap coil packs to see if that’s the issue

[Ed93]

Originally Posted by Ed93

Turning over an old stone.
I am having the same issue with mine what was the verdict?
2015 Camaro SS LS3
P0308 misfire #8
Stabilitrak Code
Plug ✅
Wires (MSD) ✅
Swap coil 1-8 ✅
Fuel pressure ✅
Swap injector 1-8 ✅
Checked pushrod (visual) ✅
Valve Spring (visual) ✅
Deleted code every time ✅
Battery ✅

Always comes back to misfire # 8 and stablink code, every time.

Any ideas?

I’m an idiot!
I’ve been working #7!
#8 is bad.
Checked continuity and nothing on #8