I messed up, need some help - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

homestead_us · 04-05-2014, 05:37 PM

Edit: it ended up being the #8 intake valve spring. Not driving hard, in the morning in my neighborhood. I hope warranty will cover it.

GONIF · 04-05-2014, 05:48 PM

Get a meter and check the resistance of the plug wire ,make shure you did not crack the new plug .

homestead_us · 04-05-2014, 05:58 PM

I checked them before I installed, and compared with a known good cylinder I was at 38.8 ohm. I also cleaned out the grease just to make sure that wasnt causing any issues with boot to plug contact. All of this happened with only the two fuses being removed, I dont get it.

Edit:
Good call of checking the wires again, I pulled #8 and #1. I noticed #8 was jumping around a lot every time I moved. I checked #1 and moved around and it never changed the reading. Looks like I have a bad #8 wire, Ill go pick up a new set wires and report back.
Thanks again!

homestead_us · 04-05-2014, 07:36 PM

I managed to crimp the wire connectors a little with some channel locks to see if the reading would stabilize and they did. Wire seems fine but Im still throwing a #8 cylinder misfire for now apparent reason. Anyone else?

Destructo09 · 04-05-2014, 07:58 PM

If your car is a 2012 why not just take it to the dealer and let them figure it out?

JANNETTYRACING · 04-05-2014, 08:07 PM

Quote:

Originally Posted by homestead_us

So Im new here obviously but Ive been reading for a while and gathering information. I just bought my '12 SS yesterday and wanted to try the fuse pull since it seemed like the easiest thing to try first. Prior to this, I drove the car for 120 miles with no issues at all.
I pulled # 5 and #20 fuses, let the car sit for over an hr and installed them. Started up the car and it ran fine, took off for a drive and all the sudden my stability control light comes on and the car starts misfiring. I turn around and get home asap. After reading the codes, Im seeing random misfire P0300 which turned into P0308 #8 misfire. I pull the plug and it looks a little rough along with the rest. After a new set of NGK plugs, the car is still misfiring and giving me a P0308 code.
After that, I tried switching the wires (MSD 8.5mm) from #8 to #2 to see if the misfire jumps to #2 cylinder but instead I get a P02548 code along with the P0308. Im at a loss right now, so I pulled the two 5 and 20 fuses and disconnected the battery.
What could have happened already since the car seemed to be running fine the day before, besides me messing with it.
Any help would be great!

James

Which NGK plus and what gap?

Did you use Never Seize on the plugs?

Never Seize is a conductor and can short a spark plug if it gets on the center electrode or porcelin.

Do you have any stock wires you can test with?

homestead_us · 04-05-2014, 09:04 PM

No anti seize and no stock wires, just a swap but I try a new wire (MSD 8.5) I had laying around for a different vehicle.

This was all happening before I swapped in new plugs but Im running the NGK Iridium's (TR5IX I believe). I ended up swapping plug wires again with a different cylinder and coils as well. Still reading Cylinder 8 misfire. Then I pulled the injector plug and ohm'ed the injector, 11.8 and I checked the ply for any shorts, reads the same as cylinder 1.
Right now I feel like its a commanded misfire from the ECU.
I also pulled the #8 new plug and it was bone dry and brand new looking while #1 has some tint to it.

Im at a complete loss here, car ran fine prior to this. Im done for the night so I pulled the #5 and #20 fuse again for the rest of the night.

Looks like Ill be trying a fuel filter tomorrow after reading a thread for GM's. Someone basically had the same exact symptoms as me down to the injector not putting fuel into the cylinder. Right before changing the injector, he changed the fuel filter and it solved everything. Ill follow up tomorrow.

JANNETTYRACING · 04-05-2014, 09:34 PM

Sounds like a bad injector driver in ECM another member had a similar issue recently

poorboy10 · 04-05-2014, 10:16 PM

I'm the one Ted is referring to, i was getting a p0207 injector malfunction code.
I had to replace my pcm to rectify the problem.

homestead_us · 04-05-2014, 10:20 PM

Thats helpful, I'm just getting a P0308 (#8 misfire) right now, and apparently there is not fuel filter to replace. Ill be looking more closely at the injector itself tomorrow and bust out the stethoscope.

homestead_us · 04-06-2014, 04:46 PM

Heres the current update, #8 injector is working fine. I pulled it and cleaned it up not issues. I logged the O2 voltages and they are terrible, there is hardly any switching, real lazy and unresponsive. When I pulled the old plugs, they had the reddish brown tint on them looked like fuel additive was run. Im thinking that may have fouled up the O2's as well, Ill have to pull one to verify but right now thats what Ive been lead to.

04-05-2014, 05:58 PM	#3
homestead_us Drives: '12 2SS/RS White Join Date: Mar 2014 Location: NC Posts: 22	I checked them before I installed, and compared with a known good cylinder I was at 38.8 ohm. I also cleaned out the grease just to make sure that wasnt causing any issues with boot to plug contact. All of this happened with only the two fuses being removed, I dont get it. Edit: Good call of checking the wires again, I pulled #8 and #1. I noticed #8 was jumping around a lot every time I moved. I checked #1 and moved around and it never changed the reading. Looks like I have a bad #8 wire, Ill go pick up a new set wires and report back. Thanks again! Last edited by homestead_us; 04-05-2014 at 06:13 PM.

04-05-2014, 09:04 PM	#7
homestead_us Drives: '12 2SS/RS White Join Date: Mar 2014 Location: NC Posts: 22	No anti seize and no stock wires, just a swap but I try a new wire (MSD 8.5) I had laying around for a different vehicle. This was all happening before I swapped in new plugs but Im running the NGK Iridium's (TR5IX I believe). I ended up swapping plug wires again with a different cylinder and coils as well. Still reading Cylinder 8 misfire. Then I pulled the injector plug and ohm'ed the injector, 11.8 and I checked the ply for any shorts, reads the same as cylinder 1. Right now I feel like its a commanded misfire from the ECU. I also pulled the #8 new plug and it was bone dry and brand new looking while #1 has some tint to it. Im at a complete loss here, car ran fine prior to this. Im done for the night so I pulled the #5 and #20 fuse again for the rest of the night. Looks like Ill be trying a fuel filter tomorrow after reading a thread for GM's. Someone basically had the same exact symptoms as me down to the injector not putting fuel into the cylinder. Right before changing the injector, he changed the fuel filter and it solved everything. Ill follow up tomorrow. Last edited by homestead_us; 04-05-2014 at 09:15 PM.

04-05-2014, 10:16 PM	#9
poorboy10 Drives: 2010 2ss Join Date: Dec 2012 Location: san antonio Posts: 62	I'm the one Ted is referring to, i was getting a p0207 injector malfunction code. I had to replace my pcm to rectify the problem. __________________ 2010 l99 summit white w/inferno orange stripes and interior. Texas Speed longtubes, halltech cold air intake,v-max ported throttle body, MSD wires, NGK plugs, Spintech catback with x-pipe, GPI SS1 VVT camshaft.

04-05-2014, 05:37 PM	#1
homestead_us Drives: '12 2SS/RS White Join Date: Mar 2014 Location: NC Posts: 22	I messed up, need some help Edit: it ended up being the #8 intake valve spring. Not driving hard, in the morning in my neighborhood. I hope warranty will cover it. Last edited by homestead_us; 04-10-2014 at 12:47 PM. Reason: Was not the problem

04-05-2014, 05:48 PM	#2
GONIF Drives: 73 VETTE ,, 05 2500hd diesel,14 1LE Join Date: Feb 2014 Location: The Left lane PHOENIX AZ Posts: 2,626	Get a meter and check the resistance of the plug wire ,make shure you did not crack the new plug . __________________ OLD GUY FLYING FAST AND LOW

04-05-2014, 07:36 PM	#4
homestead_us Drives: '12 2SS/RS White Join Date: Mar 2014 Location: NC Posts: 22	I managed to crimp the wire connectors a little with some channel locks to see if the reading would stabilize and they did. Wire seems fine but Im still throwing a #8 cylinder misfire for now apparent reason. Anyone else?

04-05-2014, 07:58 PM	#5
Destructo09 Drives: 2010 CGM Camaro 2SS/LS3 Join Date: Oct 2013 Location: Raleigh-Durham Posts: 1,409	If your car is a 2012 why not just take it to the dealer and let them figure it out? __________________ 2010 2SS BMR 1" Springs Koni Orange struts/shocks 1LE rear sway bar SRP Racing Pedals Hurst Billet short shifter Square tire/wheel setup Elite Engineering Catch Can Stainless Power longtubes/highflow cats K&N Typhoon CAI RPM Motorsports of Garner, NC dyno tune (421 RWHP)

04-05-2014, 09:34 PM	#8
JANNETTYRACING Drives: BLUE CAMARO ZL1 1LE M6 Join Date: Jun 2009 Location: ON THE DYNO WATERBURY CT. Posts: 15,427	Sounds like a bad injector driver in ECM another member had a similar issue recently __________________ www.jannettyracing.com Celebrating 39 years Performance parts, Installation, Fabrication, Dyno tuning, Remote custom tuning, and alignments. 203-753-7223 Waterbury CT. 06705 email tedj@jannettyracing.com

04-05-2014, 10:20 PM	#10
homestead_us Drives: '12 2SS/RS White Join Date: Mar 2014 Location: NC Posts: 22	Thats helpful, I'm just getting a P0308 (#8 misfire) right now, and apparently there is not fuel filter to replace. Ill be looking more closely at the injector itself tomorrow and bust out the stethoscope.

04-06-2014, 04:46 PM	#11
homestead_us Drives: '12 2SS/RS White Join Date: Mar 2014 Location: NC Posts: 22	Heres the current update, #8 injector is working fine. I pulled it and cleaned it up not issues. I logged the O2 voltages and they are terrible, there is hardly any switching, real lazy and unresponsive. When I pulled the old plugs, they had the reddish brown tint on them looked like fuel additive was run. Im thinking that may have fouled up the O2's as well, Ill have to pull one to verify but right now thats what Ive been lead to.