Exhaust pop and strange idle.... - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

meltyface · 05-12-2010, 10:19 PM

I was just wondering about a couple things. I recently installed kooks 1 7/8 headers, high flow cats, borla x-pipe and stinger exhaust, plus had a tune done. The thing is when I'm driving and slow down the RPMs I start to hear a popping sound. I understand that there is a "bubbling" sound from the fuel burning off, but the pops are slight and in addition to the bubbling.

Also when I stop at a redlight or whatever, my RPMS will fall to idle, then shoot up to about 1k and then back down to idle, and while at idle I can see the needle jumping around a little bit (probably about +- 100 rpms).

Can someone give me a little insight to this? ....Thanks

Ject · 05-12-2010, 10:23 PM

Sounds like possible Tune issues. The poping... sounds like it may be running a little too rich.

meltyface · 05-12-2010, 10:30 PM

I've been thinking the same thing, but I just want to make sure before I go back up to the shop, I don't want to waste my or his time.

Ivan @ Southwest Speed · 05-12-2010, 11:11 PM

Quote:

Originally Posted by Ject

Sounds like possible Tune issues. The poping... sounds like it may be running a little too rich.

Exactly that...

..or the trunk monkey.

-Ivan

AlSuwaidi · 05-12-2010, 11:48 PM

if it was just popping Id say thats perfect.. but the weird idle is probably a tune issue.. go check it out or get a 2nd opinion at another shop

meltyface · 05-13-2010, 12:57 PM

thanks for the input, I'll get ahold of my tuner and hopefully he can fix the issue. I really don't want to spend $500 for another tune from a different guy :(

FastOil · 05-13-2010, 06:10 PM

ge the car tunned by a reliable tunner.

SSinthedesert · 05-13-2010, 06:25 PM

Did you noice the popping before the LTs? I'd say the popping was there before, it's just louder now that you have LTs and full exhaust and is just more noticeable. Which is normal. The idle, idk but prolly from the tune. If whoever tuned it won't check it out, for free, go somewhere else.

meltyface · 05-14-2010, 12:03 PM

Thx, I'm pretty sure he'll check it out for me for free, I was just saying I'm not wanting to go somewhere else and pay if I don't have to.

ratlover · 05-14-2010, 12:38 PM

Poping is "normal" and just much more noticable. I am still trying to figure it out 100% and know exactly what I can get away with. I'm still in the process of tuning out the pop. The factory yanks a lot of timing when it goes into decel fuel cut off mode. I'm 99.9% that the only reason is to burn off any vapor or unburnt fuel in the exhaust. I don't know 100% on what you would want to run for timing if you had cats compared to me(no cats)?

I thought the pop was anoying with stock exhaust.....LT headers, no cats and 3" exhaust makes it NASTY lol

Idel issue is not normal.

The 2010 Sin · 05-14-2010, 12:42 PM

The only annoying pop is the startup pop when the engine starts everytime you get that lil pop. I hear it on a bunch of peoples exhaust videos and i hear it when i start mine.. so now i start it with a lil pressure on the accelerator and it fixes it..

duffmobile · 05-14-2010, 01:04 PM

make sure your CAI didn't slip off the throttle body. Mine did one day and it was running rough like yours at idle. Could be that, or definitely something wrong with the tune.

05-12-2010, 10:19 PM	#1
meltyface Drives: 2010 1SS CGM LS3 w/ blk rally Join Date: Jan 2010 Location: san diego, CA area Posts: 258	Exhaust pop and strange idle.... I was just wondering about a couple things. I recently installed kooks 1 7/8 headers, high flow cats, borla x-pipe and stinger exhaust, plus had a tune done. The thing is when I'm driving and slow down the RPMs I start to hear a popping sound. I understand that there is a "bubbling" sound from the fuel burning off, but the pops are slight and in addition to the bubbling. Also when I stop at a redlight or whatever, my RPMS will fall to idle, then shoot up to about 1k and then back down to idle, and while at idle I can see the needle jumping around a little bit (probably about +- 100 rpms). Can someone give me a little insight to this? ....Thanks __________________ Installed mods: Kooks 1 7/8" headers w/ high flow cats, Borla x-pipe, Borla Stinger exhaust, Cold Air Inductions CAI, markers, tail and reverse lights plus parking light blackouts, body colored bowties, body colored SS emblems, Passport 9500 radar detector (a must have), Kenwood DNX9960 radio w/ metra kit. Matte Black Giovanna Dalar 5V: 20x8.5 & 20x10 wheels Mods in the future: Relocating guts of "shark fin" and removing it, cam, super charge/turbo?...unsure what after that... Gotta have MORE power!!

05-12-2010, 10:23 PM	#2
Ject aka Patrick Drives: '10 Camaro 2SS '04 Silverado Join Date: Jan 2009 Location: Derby Kansas Posts: 3,072	Sounds like possible Tune issues. The poping... sounds like it may be running a little too rich. __________________ Current Modifications: Your average Bolt-ons & Suspension Upgrades GForce Engineering: 9" Rear End, Strange Pro Iron Case w/Moser Nodular 3.70:1 Detroit locker, 3.5" Solid Drive Shaft

05-12-2010, 10:30 PM	#3
meltyface Drives: 2010 1SS CGM LS3 w/ blk rally Join Date: Jan 2010 Location: san diego, CA area Posts: 258	I've been thinking the same thing, but I just want to make sure before I go back up to the shop, I don't want to waste my or his time. __________________ Installed mods: Kooks 1 7/8" headers w/ high flow cats, Borla x-pipe, Borla Stinger exhaust, Cold Air Inductions CAI, markers, tail and reverse lights plus parking light blackouts, body colored bowties, body colored SS emblems, Passport 9500 radar detector (a must have), Kenwood DNX9960 radio w/ metra kit. Matte Black Giovanna Dalar 5V: 20x8.5 & 20x10 wheels Mods in the future: Relocating guts of "shark fin" and removing it, cam, super charge/turbo?...unsure what after that... Gotta have MORE power!!

05-13-2010, 12:57 PM	#6
meltyface Drives: 2010 1SS CGM LS3 w/ blk rally Join Date: Jan 2010 Location: san diego, CA area Posts: 258	thanks for the input, I'll get ahold of my tuner and hopefully he can fix the issue. I really don't want to spend $500 for another tune from a different guy :( __________________ Installed mods: Kooks 1 7/8" headers w/ high flow cats, Borla x-pipe, Borla Stinger exhaust, Cold Air Inductions CAI, markers, tail and reverse lights plus parking light blackouts, body colored bowties, body colored SS emblems, Passport 9500 radar detector (a must have), Kenwood DNX9960 radio w/ metra kit. Matte Black Giovanna Dalar 5V: 20x8.5 & 20x10 wheels Mods in the future: Relocating guts of "shark fin" and removing it, cam, super charge/turbo?...unsure what after that... Gotta have MORE power!!

05-14-2010, 12:03 PM	#9
meltyface Drives: 2010 1SS CGM LS3 w/ blk rally Join Date: Jan 2010 Location: san diego, CA area Posts: 258	Thx, I'm pretty sure he'll check it out for me for free, I was just saying I'm not wanting to go somewhere else and pay if I don't have to. __________________ Installed mods: Kooks 1 7/8" headers w/ high flow cats, Borla x-pipe, Borla Stinger exhaust, Cold Air Inductions CAI, markers, tail and reverse lights plus parking light blackouts, body colored bowties, body colored SS emblems, Passport 9500 radar detector (a must have), Kenwood DNX9960 radio w/ metra kit. Matte Black Giovanna Dalar 5V: 20x8.5 & 20x10 wheels Mods in the future: Relocating guts of "shark fin" and removing it, cam, super charge/turbo?...unsure what after that... Gotta have MORE power!!

05-12-2010, 11:48 PM	#5
AlSuwaidi Drives: BLACK LS3 GCC-Spec Join Date: Oct 2009 Location: UAE - SHARJAH Posts: 2,824 View My Garage	if it was just popping Id say thats perfect.. but the weird idle is probably a tune issue.. go check it out or get a 2nd opinion at another shop

05-13-2010, 06:10 PM	#7
FastOil Drives: none Join Date: May 2010 Location: here Posts: 80	ge the car tunned by a reliable tunner.

05-13-2010, 06:25 PM	#8
SSinthedesert Drives: 2010 Imperial Blue SS Join Date: Feb 2010 Location: New Mexico Posts: 50	Did you noice the popping before the LTs? I'd say the popping was there before, it's just louder now that you have LTs and full exhaust and is just more noticeable. Which is normal. The idle, idk but prolly from the tune. If whoever tuned it won't check it out, for free, go somewhere else.

05-14-2010, 12:38 PM	#10
ratlover Drives: 2010 Inferno Orange SS 6 speed Join Date: Mar 2010 Location: Peoria, IL Posts: 68	Poping is "normal" and just much more noticable. I am still trying to figure it out 100% and know exactly what I can get away with. I'm still in the process of tuning out the pop. The factory yanks a lot of timing when it goes into decel fuel cut off mode. I'm 99.9% that the only reason is to burn off any vapor or unburnt fuel in the exhaust. I don't know 100% on what you would want to run for timing if you had cats compared to me(no cats)? I thought the pop was anoying with stock exhaust.....LT headers, no cats and 3" exhaust makes it NASTY lol Idel issue is not normal.

05-14-2010, 12:42 PM	#11
The 2010 Sin Dont H8 Me Cuz U Aint Me Drives: 2016 SS Sedan, 2017 Explorer Sport Join Date: Feb 2010 Location: Tulsa, Oklahoma Posts: 2,910	The only annoying pop is the startup pop when the engine starts everytime you get that lil pop. I hear it on a bunch of peoples exhaust videos and i hear it when i start mine.. so now i start it with a lil pressure on the accelerator and it fixes it.. __________________

05-14-2010, 01:04 PM	#12
duffmobile Drives: 2010 Camaro 2SS/RS - IOM/IOM Join Date: Mar 2009 Location: Frankfort, IL Posts: 374	make sure your CAI didn't slip off the throttle body. Mine did one day and it was running rough like yours at idle. Could be that, or definitely something wrong with the tune.