Cammed ZL1 misfires - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

FlowZl1 · 04-26-2021, 05:50 PM

Alright, new to the thread, and new to camaros as well. So forgive my ignorance. So I recently Cammed my 12 ZL1 (BTR STG3), all was good during break in and we followed everything to the t on assembly utilizing the LS benchmark build guid I bought off of Amazon. During break in everything ran as it should with signs of anything being out of place. After break in and oil change I got the go ahead from my tunner to start tunning and send her on home. Under WOT in any gear it would start misfiring under boost at 4 K, she was breaking up bad. We did all we could to locate the issue, check fuel spark air, checked ground, made a dimple in headers to clear steering rack, and a few other things. How ever she was still misfiring. I ended up replacing the SC isolator coupler as she went bad shortly after. Once I reistalled with Lifeinger coupler the engine started misfiring on idle, and under any load she would just bog down. The throttle also on a flat surface has to be about 10% engaged to move. I’m really lost at this point and I have literally no information on where to go from here. I need help bad 😅

JB'sZL1 · 04-26-2021, 07:07 PM

Check the tune, and obviously, bad plugs or wires.

Batmanntexas · 04-26-2021, 07:11 PM

1. Are you datalogging at all?
2. Is it a random misfire, or isolated to a cylinder or two?
3. Have you performed a compression test on all 8 cylinders?
4. What plugs and what's the gap?
5. Are you losing any coolant from the intercooler reservoir?

-Scott

xdamxincx · 04-27-2021, 11:22 AM

did u upgrade your valve springs ?

Mmcmon · 04-28-2021, 11:39 PM

Quote:

Originally Posted by FlowZl1

Alright, new to the thread, and new to camaros as well. So forgive my ignorance. So I recently Cammed my 12 ZL1 (BTR STG3), all was good during break in and we followed everything to the t on assembly utilizing the LS benchmark build guid I bought off of Amazon. During break in everything ran as it should with signs of anything being out of place. After break in and oil change I got the go ahead from my tunner to start tunning and send her on home. Under WOT in any gear it would start misfiring under boost at 4 K, she was breaking up bad. We did all we could to locate the issue, check fuel spark air, checked ground, made a dimple in headers to clear steering rack, and a few other things. How ever she was still misfiring. I ended up replacing the SC isolator coupler as she went bad shortly after. Once I reistalled with Lifeinger coupler the engine started misfiring on idle, and under any load she would just bog down. The throttle also on a flat surface has to be about 10% engaged to move. I’m really lost at this point and I have literally no information on where to go from here. I need help bad 😅

What type of misfires are you experiencing when you log all 8 cylinders on your scanner? Is a misfire occurring in small amounts like 1 to 6 times on random cylinders? Or is it like 1000 misfires on the same cylinder?
After installing a cam there are parameters in the tune that must be taken into account using the specs of your cam. Your valves are opening differently than stock now.

FlowZl1 · 04-29-2021, 11:08 AM

Ok so since I don’t have the laptop for tuning (it’s my buddies) i haven’t recently checked parameters, I will get it here shortly and set up to read each cylinder for misfires.
Plugs are gapped to .035, TR6IX, brand new wires as well. I have an extra set of plugs that are brand new that I can swap in. Just wasn’t sure if that would be the issue. Have not performed a compression check but I probably should, I’ll try these things and get back, I appreciate the response ! I have a few videos of it running I can upload I just don’t know how to upload them.

CJ27 · 04-30-2021, 01:07 AM

Quote:

Originally Posted by FlowZl1

Ok so since I don’t have the laptop for tuning (it’s my buddies) i haven’t recently checked parameters, I will get it here shortly and set up to read each cylinder for misfires.
Plugs are gapped to .035, TR6IX, brand new wires as well. I have an extra set of plugs that are brand new that I can swap in. Just wasn’t sure if that would be the issue. Have not performed a compression check but I probably should, I’ll try these things and get back, I appreciate the response ! I have a few videos of it running I can upload I just don’t know how to upload them.

Could be as simple as a cracked plug.

Bigtime53 · 04-30-2021, 04:21 PM

I hope the OP lets us know what was wrong and the fix he did to correct this.

04-26-2021, 05:50 PM	#1
FlowZl1 Drives: 2012 Chevy camaro ZL1 Join Date: Apr 2021 Location: San Diego Posts: 2	Cammed ZL1 misfires Alright, new to the thread, and new to camaros as well. So forgive my ignorance. So I recently Cammed my 12 ZL1 (BTR STG3), all was good during break in and we followed everything to the t on assembly utilizing the LS benchmark build guid I bought off of Amazon. During break in everything ran as it should with signs of anything being out of place. After break in and oil change I got the go ahead from my tunner to start tunning and send her on home. Under WOT in any gear it would start misfiring under boost at 4 K, she was breaking up bad. We did all we could to locate the issue, check fuel spark air, checked ground, made a dimple in headers to clear steering rack, and a few other things. How ever she was still misfiring. I ended up replacing the SC isolator coupler as she went bad shortly after. Once I reistalled with Lifeinger coupler the engine started misfiring on idle, and under any load she would just bog down. The throttle also on a flat surface has to be about 10% engaged to move. I’m really lost at this point and I have literally no information on where to go from here. I need help bad 😅

04-26-2021, 07:11 PM	#3
Batmanntexas Drives: 2012 Camaro SS (2SS) Join Date: Aug 2012 Location: Stafford, VA Posts: 1,395 View My Garage	1. Are you datalogging at all? 2. Is it a random misfire, or isolated to a cylinder or two? 3. Have you performed a compression test on all 8 cylinders? 4. What plugs and what's the gap? 5. Are you losing any coolant from the intercooler reservoir? -Scott __________________ 745RWHP/634RWTQ on 93 @ 10psi 806/676 on E85 @ 10psi Currently @15-16psi.... COTW 9/8/14

04-26-2021, 07:07 PM	#2
JB'sZL1 Drives: 2013 ZL1 and 2019 Ram Laramie Join Date: May 2017 Location: Milwaukee Posts: 1,259	Check the tune, and obviously, bad plugs or wires.

04-27-2021, 11:22 AM	#4
xdamxincx Banned Drives: zl1 blk Join Date: Nov 2017 Location: sth fl Posts: 152	did u upgrade your valve springs ?

04-29-2021, 11:08 AM	#6
FlowZl1 Drives: 2012 Chevy camaro ZL1 Join Date: Apr 2021 Location: San Diego Posts: 2	Ok so since I don’t have the laptop for tuning (it’s my buddies) i haven’t recently checked parameters, I will get it here shortly and set up to read each cylinder for misfires. Plugs are gapped to .035, TR6IX, brand new wires as well. I have an extra set of plugs that are brand new that I can swap in. Just wasn’t sure if that would be the issue. Have not performed a compression check but I probably should, I’ll try these things and get back, I appreciate the response ! I have a few videos of it running I can upload I just don’t know how to upload them.

04-30-2021, 04:21 PM	#8
Bigtime53 Drives: 2013 ZL1 Join Date: Mar 2013 Location: Oklahoma Posts: 2,326	I hope the OP lets us know what was wrong and the fix he did to correct this.