Helppp misfire! - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

agt061794 · 10-28-2021, 02:54 PM

Car is a 2015 1le LS3 car
Full bolt ons and tuned
Recently got fresh plugs and wires.

So i drove to work last night all was good. Had a fresh tank of fuel it rained all night, i got in it fire it up started driving instantly misfiring, no codes were being thrown except the flashing check engine light, and obviously that disables the trac control and other shit , so i got home unplugged battery and went to sleep so i started it back up after i woke up and ran it , it had Cyl 7 mis fire , and Cyl 7 injector code, so i ran the car unhooked a coil at a time and every coil was firing, then i checked resistance on driver side bank of injectors. All reading around 18 ohms except for injector #7 it has high resistance of like 39 , now usually a shorted injector coil would show no resistance. Soo idk what the **** is going on. I can’t get it to throw a decent code. Attached is a pic of the plug for cylinder #7 the only one that looks like that. All others look good.
I also pulled valve cover and all looks normal there.

Any hell would be appreciated.

KaBoom1701 · 10-28-2021, 04:00 PM

Don't see the pic you attached?

But the poor man mechanic in me says to swap your #7 SP wire with another cylinder and see if the problem follows the wire. If not then try swapping the spark plug to another cylinder as well.

Hopefully this narrows down your issue.

kleanSS · 11-09-2021, 08:00 AM

I'm in the process of getting a remote tune from PCMNC and after 6-7 tunes, I too am getting misfires on cylinder 7. I hooked up the HPtuner OBD scanner and unable filters for all misfires and history then data logged. I got 6-8 on cylinder 7 but then i see a couple on 2,3 and 8 too. I had done plugs and wires, long tubes and JLT intake then started the tune with them. I checked plugs and wires and they were good. cleaned the MAF sensor while i was looking under there. Now i get 2-3 hits occasionally on the same ones but mostly 0 on the counters. last night threw in some deep fuel cleaner and a fresh tank of 93 as an added measure. these are just some of the things i did to help clear up some. Also, I have not got a CEL which tells me it isn't bad enough yet.

Risingson05 · 11-09-2021, 08:23 AM

Coil packs ? Possibly bad ground somewhere .

10-28-2021, 02:54 PM	#1
agt061794 Drives: 2015 Camaro 2SS RS 1LE Join Date: Jun 2021 Location: Collierville TN Posts: 9	Helppp misfire! Car is a 2015 1le LS3 car Full bolt ons and tuned Recently got fresh plugs and wires. So i drove to work last night all was good. Had a fresh tank of fuel it rained all night, i got in it fire it up started driving instantly misfiring, no codes were being thrown except the flashing check engine light, and obviously that disables the trac control and other shit , so i got home unplugged battery and went to sleep so i started it back up after i woke up and ran it , it had Cyl 7 mis fire , and Cyl 7 injector code, so i ran the car unhooked a coil at a time and every coil was firing, then i checked resistance on driver side bank of injectors. All reading around 18 ohms except for injector #7 it has high resistance of like 39 , now usually a shorted injector coil would show no resistance. Soo idk what the **** is going on. I can’t get it to throw a decent code. Attached is a pic of the plug for cylinder #7 the only one that looks like that. All others look good. I also pulled valve cover and all looks normal there. Any hell would be appreciated.

10-28-2021, 04:00 PM	#2
KaBoom1701 KaBoom1701 Drives: 13' ZL1 Red M6 Join Date: Dec 2012 Location: I.E. SoCal (Yucaipa) Posts: 8,606	Don't see the pic you attached? But the poor man mechanic in me says to swap your #7 SP wire with another cylinder and see if the problem follows the wire. If not then try swapping the spark plug to another cylinder as well. Hopefully this narrows down your issue. __________________ Mods: Roto-Fab Intake, WW Res. kit & Big Gulp Air Scoop, Elite Catch Can, ATI Super Damper & 18% OD Pulley, LF Idler pulley bracket, Metco CC breather, ID850 Injectors, Stainless Power Headers w/ ceramic coating, TR71X Spark Plugs, JMS Fuel Pump Booster, Bo White TB, Tuned by Ted @ Jannetty Racing, Ron Davis HX, D3 Reservoir, Pfadt 1" Springs, Moreno Camber Plates, ZL1 Addons Splitter guard washers, Tow Hook kit & rock guards, Hurst Shifter Billet Plus 6 Speed Short Shifter, ZL1 DRL lighting harness, ZL1 Recaro Seats.

11-09-2021, 08:00 AM	#3
kleanSS Drives: 2011 SS Join Date: Apr 2021 Location: VA Posts: 5	I'm in the process of getting a remote tune from PCMNC and after 6-7 tunes, I too am getting misfires on cylinder 7. I hooked up the HPtuner OBD scanner and unable filters for all misfires and history then data logged. I got 6-8 on cylinder 7 but then i see a couple on 2,3 and 8 too. I had done plugs and wires, long tubes and JLT intake then started the tune with them. I checked plugs and wires and they were good. cleaned the MAF sensor while i was looking under there. Now i get 2-3 hits occasionally on the same ones but mostly 0 on the counters. last night threw in some deep fuel cleaner and a fresh tank of 93 as an added measure. these are just some of the things i did to help clear up some. Also, I have not got a CEL which tells me it isn't bad enough yet.

11-09-2021, 08:23 AM	#4
Risingson05 Drives: 2015 zl1 Join Date: Jan 2020 Location: Anchorage Posts: 491	Coil packs ? Possibly bad ground somewhere .