New exhaust need retune? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

smegal417 · 09-13-2020, 04:47 PM

I recently installed a new exhaust system. After the installation the car acts like it has a miss or something is really wrong. It surges, pops under wide open throttle and the wideband is all over the place at idle and during a pull. I was told I wouldn't need a tune again, but nothing else was changed. All I did was remove the exhaust it was previously tuned with ( factory piping with no cats, resonators, or mufflers) and installed speed engineerings 3" xpipe exhaust. I already had their longtubes headers. Car is cammed, has a 3400 stall and gears.

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Warship2k15 · 09-13-2020, 05:00 PM

Somethings wrong.You either have a leak or something else isn’t right.
Spark plug not firing or lead isn’t on etc.

smegal417 · 09-13-2020, 06:48 PM

Quote:

Originally Posted by Warship2k15

Somethings wrong.You either have a leak or something else isn’t right.
Spark plug not firing or lead isn’t on etc.

I mean obviously something is wrong. But nothing was touched except the exhaust piping under the car. It ran perfectly fine until I changed the exhaust and I'm reading conflicting things with some people saying you must always tune and then my tuner telling me I don't need to. When obviously, something is making the ECU not react right. All connections are extremely tight (air impact tightened) and not leaking. Just figured maybe someone else in here had put a full exhaust on and maybe had a similar issue. Or didn't.

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JLGO · 09-13-2020, 07:19 PM

Check the air flow sensor. Those things can go bad unexpectedly. No you do not neeed a tune after changing the mufflers. Also check for codes.

Avenging Orange · 09-13-2020, 08:14 PM

Yes, if you add headers to your exhaust, you need a tune. Otherwise, no.
If your tuner is with his weight...he would still have you come in to double check things and diagnosis.
So, If I were you, Id go back to my tuner and get some kind of handle on things.

WHAMMO · 09-14-2020, 11:27 PM

Its not the tune. Its either a cracked spark plug, unplugged wire, unplugged MAF, or other stuff like that.

bottletalk · 09-15-2020, 03:31 AM

was there any welding during your exhaust install? a bad ground on the welder could fry electronics. you must have codes?

Little Walter · 09-15-2020, 09:44 AM

Make certain that your O2 sensor extension connectors are good and plugged in, sounds like that loop might be open.

Avenging Orange · 09-15-2020, 10:11 AM

Quote:

Originally Posted by WHAMMO

Its not the tune. Its either a cracked spark plug, unplugged wire, unplugged MAF, or other stuff like that.

If I read OP's post right, he only replaced catback. He already had headers.

Adeeyos · 09-15-2020, 07:17 PM

Sounds to me, based on what the OP has said, something like a maf sensor, loose plug wire, or loose o2 connector is the problem. The fact that it happened when he changed the exhaust is just a coincidence, unless like "bottletalk" said, if there was welding done with a poorly grounded welder.

Warship2k15 · 09-16-2020, 08:12 AM

Quote:

Originally Posted by Adeeyos

Sounds to me, based on what the OP has said, something like a maf sensor, loose plug wire, or loose o2 connector is the problem. The fact that it happened when he changed the exhaust is just a coincidence, unless like "bottletalk" said, if there was welding done with a poorly grounded welder.

Exactly what I was trying to say by he has problem and pointed out some of the likely culprits.It seams like he didn’t like my advice and is still stuck on the fact that he changed exhausts instead of troubleshooting and figuring it out.

09-13-2020, 04:47 PM	#1
smegal417 Drives: 2010 Camaro 2SS/RS Join Date: Jan 2019 Location: Springfield, MO Posts: 71	New exhaust need retune? I recently installed a new exhaust system. After the installation the car acts like it has a miss or something is really wrong. It surges, pops under wide open throttle and the wideband is all over the place at idle and during a pull. I was told I wouldn't need a tune again, but nothing else was changed. All I did was remove the exhaust it was previously tuned with ( factory piping with no cats, resonators, or mufflers) and installed speed engineerings 3" xpipe exhaust. I already had their longtubes headers. Car is cammed, has a 3400 stall and gears. Sent from my SM-G986U using Tapatalk

09-13-2020, 07:19 PM	#4
JLGO Drives: 2015 Camaro SS convertible L99 Join Date: Nov 2016 Location: Orlando, FL Posts: 245	Check the air flow sensor. Those things can go bad unexpectedly. No you do not neeed a tune after changing the mufflers. Also check for codes. __________________ Corsa CAI w/Donalson Power Filter, BBK 1 7/8 headers, MF resonator, custom exhaust with Legato mufflers, mildly ported heads, TSP VVT 3.2 cam (whole package), 3.91 1LE gears, Circle D 3200 stall torque converter, B&M power cooler tranny cooler. Tuned by Casey TSP's tuner. 1/4 12.16 117mph with stock tires at 20 psi.

09-13-2020, 08:14 PM	#5
Avenging Orange Drives: 2010 Inferno Orange 2SS/RS Join Date: Apr 2010 Location: Clermont, IN Posts: 3,297	Yes, if you add headers to your exhaust, you need a tune. Otherwise, no. If your tuner is with his weight...he would still have you come in to double check things and diagnosis. So, If I were you, Id go back to my tuner and get some kind of handle on things. __________________ 2010 Inferno Orange 2SS/RS M6 Black Leather, Sun Roof, OBX Headers, Borla touring axle back, Cold Air Inductions CAI , non synthetic fluids, BMR total bushing upgrade/1" lowering springs, DSE 32mm rear sway bar. GM fe4 shocks/struts/LCA's, AAM 3.91 diff, Vertini RFS1.8 20x9 +30. Conti ExtremeContact Sport 275/35/20. sjm autoprod ABL dash kit. Mike Norris tuned 413/419. Avenging Orange: 43 years of not buying into the Hype........and damn proud of it!! https://youtu.be/9JD9it6SmB8 https://youtu.be/xmelTlEzI34 KICKING CANCERS ASS SINCE 2015!!

09-14-2020, 11:27 PM	#6
WHAMMO Drives: 13' 1LE Join Date: Apr 2012 Location: Canada Posts: 2,640	Its not the tune. Its either a cracked spark plug, unplugged wire, unplugged MAF, or other stuff like that. __________________ 13' 1LE Old setup: TSP 231-236/Tick 660/.105 PR, UDP, SW LT 2'' & HFC, stock NPP & H pipe, VR-DRX CAI, air scoop, Goertz1 manifold, 102mm BBK, 26" Toyo DRs, Forgestars R17x10 & F18x8, rear seat delete, remote Pat G tune Autocal, 7400 limiter, Spec Mini Twin. 91oct. 11.90@122.3, 0-60ft 2.0 / 11.99@123.6, 0-60ft 2.1 DA+819 ...519RWHP SAE Solid roller SBE LS3, FED, LLSR, 91oct, 605rwhp N/A. Tuned by Pat G. Build by me.

09-15-2020, 07:17 PM	#10
Adeeyos Drives: 2015 2SS/RS Vert Join Date: Jan 2019 Location: Michigan Posts: 14	Sounds to me, based on what the OP has said, something like a maf sensor, loose plug wire, or loose o2 connector is the problem. The fact that it happened when he changed the exhaust is just a coincidence, unless like "bottletalk" said, if there was welding done with a poorly grounded welder. __________________ Proud member of the Motor City Camaro Club.

09-13-2020, 05:00 PM	#2
Warship2k15 Drives: 2010 Camaro 2SS Join Date: May 2016 Location: Kissimmee Posts: 158	Somethings wrong.You either have a leak or something else isn’t right. Spark plug not firing or lead isn’t on etc.

09-15-2020, 03:31 AM	#7
bottletalk Drives: 15 Camaro 2SS M6 Join Date: Jan 2020 Location: BC Posts: 732	was there any welding during your exhaust install? a bad ground on the welder could fry electronics. you must have codes?

09-15-2020, 09:44 AM	#8
Little Walter Drives: ZL1 Join Date: Dec 2016 Location: New Orleans Posts: 261	Make certain that your O2 sensor extension connectors are good and plugged in, sounds like that loop might be open.