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

cpssr · 07-17-2014, 07:51 AM

I have a 2010 LS3 cammed camaro that is backfiring in all gears when I roll into the throttle or stomp on it. Also when I come to a stop it sometimes starts to rev up with my foot on the brake and clutch with the highest around 3k rpm. I cleaned the maf and checked plugs and wires. Could it be a bad tune or something else?

Thanks for the help

c-57d · 07-17-2014, 08:45 AM

Please describe all the improvements, besides the cam, that you've made.
Cover the whole intake through exhaust. I.E. headers, CAI, cat delete, etc.
Has it been tuned?
-s

cpssr · 07-17-2014, 11:16 AM

Cam, full exhaust with x pipe, headers and no cats, cai, ported tb, underdrive pulley, dyno tuned about a year ago. I am sure I missed something

B_rad1969 · 07-19-2014, 12:32 PM

I would say carbon on the piston heads and possibly a leaky injector.

chriscamaro69z28 · 07-19-2014, 12:36 PM

I had the same problem check yoru 02 sensor wires make sure they haven't melted on the headers sending a bad signal to the ecm

Bobs of FL · 07-19-2014, 08:47 PM

Is your backfiring similar to a popping noise? I have a CAI, LT Headers/high flow cats, and catback exhaust. Every time I let the RPMs slow down after accelerating, I hear: grumble, grumble, grumble, pop, pop, grumble, grumble, pop...

Enduring · 07-19-2014, 08:59 PM

Quote:

Originally Posted by Bobs of FL

Is your backfiring similar to a popping noise? I have a CAI, LT Headers/high flow cats, and catback exhaust. Every time I let the RPMs slow down after accelerating, I hear: grumble, grumble, grumble, pop, pop, grumble, grumble, pop...

That's normal for the V8s. It's just the unburnt fuel igniting in the exhaust. It shouldn't happen when accelerating though

Bobs of FL · 07-19-2014, 09:13 PM

Quote:

Originally Posted by Enduring

That's normal for the V8s. It's just the unburnt fuel igniting in the exhaust. It shouldn't happen when accelerating though

You just solved about a year of my curiosity! Thank you!

No not when accelerating, when decelerating. I wasn't sure how to describe it.

axis · 07-20-2014, 12:08 AM

If it didn't do it when you first got tuned, it's not the tune. Tunes don't go "bad" after a while. Something else is causing it. Could be the spark plugs or wires.

dklowrider · 07-20-2014, 09:00 AM

I have a crackling/ popping noise out the exhaust at around 2200-3200 rpm if the engine temp isn't up to operating level. It seems to be at part throttle accelerating, usually in 3rd and 4th gear. Sometimes it will do it even when the oil temp is up, but I can't put a specific scenario on it. If it does it once warm it won't do it again, kind of like something needed cleared out.
I thought about unburned fuel, but I also worry it's running lean or rich at that spot, sounding like a mis-fire.
I don't have the decel popping though either.
ECS 'devil' cam
1 7/8 long tubes
free flow cats
Corsa
K+N cai
underdrive pulley
M6

Tampa Tuning · 07-22-2014, 09:11 PM

Unless you have an exhaust leak, You can get rid of the most of the popping sound on deceleration by making your DFCO out of range.

07-17-2014, 07:51 AM	#1
cpssr Drives: 2010 2SS/RS Join Date: Jan 2010 Location: Haughton, LA Posts: 292	Backfiring I have a 2010 LS3 cammed camaro that is backfiring in all gears when I roll into the throttle or stomp on it. Also when I come to a stop it sometimes starts to rev up with my foot on the brake and clutch with the highest around 3k rpm. I cleaned the maf and checked plugs and wires. Could it be a bad tune or something else? Thanks for the help

07-19-2014, 12:36 PM	#5
chriscamaro69z28 army life Drives: 2018 hyper blue zl1 Join Date: Feb 2011 Location: clarksville, tn Posts: 868	I had the same problem check yoru 02 sensor wires make sure they haven't melted on the headers sending a bad signal to the ecm __________________ Mods: lingenfelter 15% overdrive pulley, ATI balancer, kooks headers, DSX low side aux pump, DSX flex fuel, GPI stage 2 cam, trans tune, cat delete, rear seat delete, rotofab cai

07-20-2014, 12:08 AM	#9
axis Search Ninja Drives: 2010 Black 2SS/RS A6 Join Date: Oct 2009 Location: Central Ark Posts: 7,183	If it didn't do it when you first got tuned, it's not the tune. Tunes don't go "bad" after a while. Something else is causing it. Could be the spark plugs or wires. __________________ 2010 Black 2SS/RS A6 Halltech CF 102 fed GPI modded intake manifold Bo (knows) White ported TB Kooks LT's/ Dynomax VT Pfadted (springs/sways) Dyno tuned by Rhino and GPI I once parallel parked a train.

07-17-2014, 08:45 AM	#2
c-57d Drives: 14 2SS/RS Triple Black Ragtop LS3 Join Date: Mar 2014 Location: California Bay Area 95008 Posts: 305 View My Garage	Please describe all the improvements, besides the cam, that you've made. Cover the whole intake through exhaust. I.E. headers, CAI, cat delete, etc. Has it been tuned? -s

07-17-2014, 11:16 AM	#3
cpssr Drives: 2010 2SS/RS Join Date: Jan 2010 Location: Haughton, LA Posts: 292	Cam, full exhaust with x pipe, headers and no cats, cai, ported tb, underdrive pulley, dyno tuned about a year ago. I am sure I missed something

07-19-2014, 12:32 PM	#4
B_rad1969 Drives: 2013 2lt Join Date: May 2014 Location: Indiana Posts: 72	I would say carbon on the piston heads and possibly a leaky injector.

07-19-2014, 08:47 PM	#6
Bobs of FL Drives: 2010 2SS Black/IOM Join Date: Sep 2013 Location: Jacksonville, FL Posts: 108	Is your backfiring similar to a popping noise? I have a CAI, LT Headers/high flow cats, and catback exhaust. Every time I let the RPMs slow down after accelerating, I hear: grumble, grumble, grumble, pop, pop, grumble, grumble, pop...

07-20-2014, 09:00 AM	#10
dklowrider Drives: 2012 1SS, 6spd. many mods 478 rwhp Join Date: Apr 2014 Location: Harrisburg Pa. Posts: 283	I have a crackling/ popping noise out the exhaust at around 2200-3200 rpm if the engine temp isn't up to operating level. It seems to be at part throttle accelerating, usually in 3rd and 4th gear. Sometimes it will do it even when the oil temp is up, but I can't put a specific scenario on it. If it does it once warm it won't do it again, kind of like something needed cleared out. I thought about unburned fuel, but I also worry it's running lean or rich at that spot, sounding like a mis-fire. I don't have the decel popping though either. ECS 'devil' cam 1 7/8 long tubes free flow cats Corsa K+N cai underdrive pulley M6

07-22-2014, 09:11 PM	#11
Tampa Tuning Account Suspended Drives: TAMPA TUNING FACEBOOK & INSTAGRAM Join Date: Oct 2010 Location: Tampa, Fl Posts: 3,044	Unless you have an exhaust leak, You can get rid of the most of the popping sound on deceleration by making your DFCO out of range.