Idle Surge after cam install 2012 Camaro SS - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Leased_SS · 03-27-2025, 11:53 AM

I installed a BTR Stage 2 V2 cam on my Auto 2012 Camaro SS (ls3 not l99 so no VVT AFM DOD). New Delphi LS7 lifters, 5/16 hardened pushrods 7.425', dual valve springs.

Just fired it up and this is what it sounds like any thoughts on what it could be?

https://youtube.com/shorts/uF7tPG9rOfQ

https://youtube.com/shorts/jX5B_VgyoYM

acammer · 03-28-2025, 08:25 AM

Quote:

Originally Posted by Leased_SS

I installed a BTR Stage 2 V2 cam on my Auto 2012 Camaro SS (ls3 not l99 so no VVT AFM DOD). New Delphi LS7 lifters, 5/16 hardened pushrods 7.425', dual valve springs.

Just fired it up and this is what it sounds like any thoughts on what it could be?

https://youtube.com/shorts/uF7tPG9rOfQ

https://youtube.com/shorts/jX5B_VgyoYM

Well - it's going to need to be tuned before it's going to idle properly. However, you may have more going on than that. It's hard to tell from the video, but it almost sounds like it's only running on 4 cylinders. This is more common than you might think - it's very easy to get the ignition coil harness flipped, and essentially have the wrong firing order. Typically you'll get some back-fires through the intake when you do this, but I have heard/seen where they will start and run, they just sound fun. So, I would make sure you don't have one bank running cold - if you do, then I would start by checking that as it is an easy, commonly made mistake.

RedTexasSS · 03-28-2025, 11:19 AM

If it's running on 4 cylinders I would check the grounds. I recall seeing this after a friend's cam install. There was a ground wire, I believe on the rear of the right cylinder head that was damaged during the cam swap and the injectors on one side were not working. Good luck.

acutron42 · 03-28-2025, 03:44 PM

My car sounded similar to this when I did the coil pack relocation & hooked up 2,4,6,8 backwards.

1JEWLDSSRS · 03-28-2025, 04:08 PM

Quote:

Originally Posted by acammer

Well - it's going to need to be tuned before it's going to idle properly. However, you may have more going on than that. It's hard to tell from the video, but it almost sounds like it's only running on 4 cylinders. This is more common than you might think - it's very easy to get the ignition coil harness flipped, and essentially have the wrong firing order. Typically you'll get some back-fires through the intake when you do this, but I have heard/seen where they will start and run, they just sound fun. So, I would make sure you don't have one bank running cold - if you do, then I would start by checking that as it is an easy, commonly made mistake.

Hey Andrew! Good to see you back in action!! Missed you brother! I hope all is well with you..

acammer · 03-28-2025, 04:52 PM

Quote:

Originally Posted by 1JEWLDSSRS

Hey Andrew! Good to see you back in action!! Missed you brother! I hope all is well with you..

Doing good - just staying SUPER busy. I really like coming on here, I just don't have the time for it. I pop in when I can!

Leased_SS · 03-28-2025, 11:22 PM

Update: I was able to fix this issue.

Reason: I never replaced the intake manifold gaskets (idk why) so I pulled them off and bought some new ones, runs good now, it does have a base tune from cordes performance in AZ to get it up and running.

Possible reasons I fixed as well: When I put the motor back together I forgot to add 2 grounds that were on it before, could have impacted the way it ran as well

acutron42 · 03-29-2025, 05:35 AM

Glad you got it fixed! I would guess it was the grounds & great advice by RedTexasSS to point those out. I have heard of people reusing intake gaskets but glad to see that you changed them also. Post another video if you can!

1JEWLDSSRS · 03-30-2025, 10:07 AM

Quote:

Originally Posted by acammer

Doing good - just staying SUPER busy. I really like coming on here, I just don't have the time for it. I pop in when I can!

Awesome my friend! Stay well!! And busy is good!!

1JEWLDSSRS · 03-30-2025, 10:09 AM

Quote:

Originally Posted by Leased_SS

Update: I was able to fix this issue.

Reason: I never replaced the intake manifold gaskets (idk why) so I pulled them off and bought some new ones, runs good now, it does have a base tune from cordes performance in AZ to get it up and running.

Possible reasons I fixed as well: When I put the motor back together I forgot to add 2 grounds that were on it before, could have impacted the way it ran as well

Awesome sir! Glad you got it all fixed up. Enjoy it..

03-27-2025, 11:53 AM	#1
Leased_SS Drives: Chevy Camaro SS Join Date: Sep 2024 Location: Arizona Posts: 6	Idle Surge after cam install 2012 Camaro SS I installed a BTR Stage 2 V2 cam on my Auto 2012 Camaro SS (ls3 not l99 so no VVT AFM DOD). New Delphi LS7 lifters, 5/16 hardened pushrods 7.425', dual valve springs. Just fired it up and this is what it sounds like any thoughts on what it could be? https://youtube.com/shorts/uF7tPG9rOfQ https://youtube.com/shorts/jX5B_VgyoYM

03-28-2025, 11:19 AM	#3
RedTexasSS Drives: 2012 SS Red w/ black rally stripes Join Date: Jan 2015 Location: San Antonio, Texas Posts: 47	If it's running on 4 cylinders I would check the grounds. I recall seeing this after a friend's cam install. There was a ground wire, I believe on the rear of the right cylinder head that was damaged during the cam swap and the injectors on one side were not working. Good luck. __________________ 2012 SS Camaro, Victory Red w/black rally stripes, SLP front splitter, ZL1 Rocker panels, ZL1 Add-ons Stealth Wickerbill, L99, Magnuson Heartbeat supercharger, 65 lb. injectors, 87 mm pulley, ZL1 fuel pump, ADM FPCM,1 7/8 Texas Speed long tube headers, v-max ported throttle body, Rotofab cold air intake with Apex scoop, Apex catch can, MSD plug wires, AEM AFR and Boost gauges, GPI SS1 VVT Cam, HP tuners with remote tune by Ryan at GPI, Solo axleback exhaust w/j pipes and stock resonator.

03-28-2025, 03:44 PM	#4
acutron42 Drives: 2013 Camaro 2SS AGM Join Date: Apr 2020 Location: WNY Posts: 965	My car sounded similar to this when I did the coil pack relocation & hooked up 2,4,6,8 backwards. __________________ 2013 2SS GPI built & tuned 415, spec'd by Andrew Cammer. GPI ported intake/tb/heads, Tooley springs, CHE trunnions, Callies rotating assembly, Diamond pistons, GPI SS3 VVT, ATI 10% ud damper, Circle D 3800, Kooks ceramic coated lt's with green cats, Mishimoto rad & oil cooler, Derale trans cooler, Holley efi rails. DSS driveshaft, trutrac with 3.91's, G-Force renegades, Hendrix solid cradle bushings Bmr: poly diff bushings, Strange adjustable coilovers, sub frame connectors, ZL1 npps, controlled with a vac pump & mac boost control solenoid.

03-29-2025, 05:35 AM	#8
acutron42 Drives: 2013 Camaro 2SS AGM Join Date: Apr 2020 Location: WNY Posts: 965	Glad you got it fixed! I would guess it was the grounds & great advice by RedTexasSS to point those out. I have heard of people reusing intake gaskets but glad to see that you changed them also. Post another video if you can! __________________ 2013 2SS GPI built & tuned 415, spec'd by Andrew Cammer. GPI ported intake/tb/heads, Tooley springs, CHE trunnions, Callies rotating assembly, Diamond pistons, GPI SS3 VVT, ATI 10% ud damper, Circle D 3800, Kooks ceramic coated lt's with green cats, Mishimoto rad & oil cooler, Derale trans cooler, Holley efi rails. DSS driveshaft, trutrac with 3.91's, G-Force renegades, Hendrix solid cradle bushings Bmr: poly diff bushings, Strange adjustable coilovers, sub frame connectors, ZL1 npps, controlled with a vac pump & mac boost control solenoid.

03-28-2025, 11:22 PM	#7
Leased_SS Drives: Chevy Camaro SS Join Date: Sep 2024 Location: Arizona Posts: 6	Update: I was able to fix this issue. Reason: I never replaced the intake manifold gaskets (idk why) so I pulled them off and bought some new ones, runs good now, it does have a base tune from cordes performance in AZ to get it up and running. Possible reasons I fixed as well: When I put the motor back together I forgot to add 2 grounds that were on it before, could have impacted the way it ran as well