High Flow Cats Causing Check Engine Light - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

timshifty · 07-12-2016, 03:36 PM

I keep getting a check engine light. I have disconnected the battery a few times and it goes away for a little bit and comes back. I thought the JBA high flow converters are not supposed to through codes?
Is this going to affect how the car runs until I can get them tuned out?

DRKS1D3 · 07-12-2016, 03:40 PM

I ran with a CEL on for over a year after I installed my JBA's. I even installed BigDaddies.com extenders, but to no avail. Last weekend, I put my BBK headers on and the light went off. The CEL was a lean code (probably because of the extenders). Now, with my increased flow from the headers, perhaps the ECU is getting the right amount of flow and that is why I'm not getting the CEL anymore.

FYI: My car ran fine with the CEL on. There was never any problem.

Tim_Hamilton · 07-12-2016, 03:53 PM

My CEL came on right around 50 miles after I installed JBA's, I put big daddies on and never got CEL again. PM me your address and Ill ship 2 to you for free if you want them. Great condition, like new, 2000ish miles on them. I went long tubes and cam now.

Dave@Sturgiscamarorally · 07-13-2016, 07:48 AM

same here... used the big daddies extension when doing my ARH long tubes and high flow cats... never had a CEL. Ran them for about a year until I did cam tune etc...

Chevrolet Customer Svc · 07-13-2016, 10:29 AM

Quote:

Originally Posted by timshifty

I keep getting a check engine light. I have disconnected the battery a few times and it goes away for a little bit and comes back. I thought the JBA high flow converters are not supposed to through codes?
Is this going to affect how the car runs until I can get them tuned out?

Hello timshifty,

We are sorry to hear your Camaro is experiencing a check engine light concern. We understand how upsetting this repeat illumination can be and would like to assist in the best way possible. If you’d like to visit your GM dealership to have your vehicle looked at, please feel free to shoot us a private message with your VIN, mileage, full contact information, and dealership name.

Steph B
Chevrolet Customer Care

G28 · 07-14-2016, 12:30 AM

Which extensions did you guys use?

ForcFed93 · 07-15-2016, 10:07 AM

I installed SOLO's over the weekend with Big Daddy angled extenders and I've driven it probably 50-100 miles and I haven't gotten a light.

Spurshot · 07-16-2016, 05:32 PM

Quote:

Originally Posted by ForcFed93

I installed SOLO's over the weekend with Big Daddy angled extenders and I've driven it probably 50-100 miles and I haven't gotten a light.

Performance wise, what do you think?

CreeperRS · 07-16-2016, 06:19 PM

Quote:

Originally Posted by Spurshot

Performance wise, what do you think?

I guess I'll be finding out soon enough. I recently got me a set of JBA HFC and I will be doing a before and after Dyno test, just for kicks. I also will be doing the same thing with the ARH shorties I will be getting soon.

Jrichards73 · 07-18-2016, 10:56 PM

Quote:

Originally Posted by Chevrolet Customer Svc

Hello timshifty,

We are sorry to hear your Camaro is experiencing a check engine light concern. We understand how upsetting this repeat illumination can be and would like to assist in the best way possible. If you’d like to visit your GM dealership to have your vehicle looked at, please feel free to shoot us a private message with your VIN, mileage, full contact information, and dealership name.

Steph B
Chevrolet Customer Care

Are you high? They replaced the factory exhaust with headers and high flow aftermarket cats, what is the dealer going to do? Unless they have HP tuners at GM dealers now; my guess is not much.

DRKS1D3 · 07-19-2016, 03:07 PM

Quote:

Originally Posted by Spurshot

Performance wise, what do you think?

The stock cats are the most restrictive part of the exhaust. High flow cats are the biggest bang for your buck. Buy 'em...enjoy 'em!

CreeperRS · 07-19-2016, 04:29 PM

Quote:

Originally Posted by Jrichards73

Are you high? They replaced the factory exhaust with headers and high flow aftermarket cats, what is the dealer going to do? Unless they have HP tuners at GM dealers now; my guess is not much.

ForcFed93 · 07-21-2016, 09:22 AM

Quote:

Originally Posted by Spurshot

Performance wise, what do you think?

Noticeable increase in power, but it's not jaw dropping by any stretch.

Kendall421 · 07-23-2016, 10:06 PM

All these responses...but nobody asking what he code is. That is the key...what code are you throwing?
I ran ARH Shorty headers with Solo HF Cats for a year and never had a code. I now have Pfadt Tri-Y with HF cats and occasionally get a P0151 code. This is the front O2 sensor taking more than 2 mins to get to temp. This can happen with LT due to the added 6 inches the sensor is from the engine. The rear sensors are tuned out, so no codes there. Your likely getting a code from the rear O2 sensors and to fix that I HIGHLY suggest Big Daddy O2 extenders...angled are even better. You will not throw a code again.

07-12-2016, 03:36 PM	#1
timshifty Drives: 2012 2SS/RS Join Date: Apr 2014 Location: Fort Wayne Posts: 560	High Flow Cats Causing Check Engine Light I keep getting a check engine light. I have disconnected the battery a few times and it goes away for a little bit and comes back. I thought the JBA high flow converters are not supposed to through codes? Is this going to affect how the car runs until I can get them tuned out? __________________ Flowmaster American Thunder Exhaust

07-12-2016, 03:40 PM	#2
DRKS1D3 Drives: '17 Corvette Grand Sport M7 Join Date: May 2012 Location: Pennsylvania Posts: 3,748	I ran with a CEL on for over a year after I installed my JBA's. I even installed BigDaddies.com extenders, but to no avail. Last weekend, I put my BBK headers on and the light went off. The CEL was a lean code (probably because of the extenders). Now, with my increased flow from the headers, perhaps the ECU is getting the right amount of flow and that is why I'm not getting the CEL anymore. FYI: My car ran fine with the CEL on. There was never any problem. __________________ MY RIDE: 2017 CORVETTE GRAND SPORT--TRIPLE BLACK, 7 SPEED MANUAL, VARARAM TCR-7 INTAKE, BORLA CATLESS X-PIPE, CARBON FIBER STAGE 2 AERO, MGW SHORT-THROW SHIFTER SOLD2011 TRIPLE BLACK SS CONVERTIBLE--6 SPEED MANUAL, MANY MODS, 455 RWHP/435 RWTQ DAD'S RIDE: 2012 ZL1 #1866--BLACK, 6 SPEED MANUAL, EXPOSED CF HOOD, POLISHED WHEELS, SUNROOF, ROTO-FAB INTAKE "Silly Americans, taking from the rich and giving to the poor only works in fairy tales. Success is earned here!".

07-12-2016, 03:53 PM	#3
Tim_Hamilton Drives: 2010 2SS RS, '14 Silverado Join Date: Dec 2013 Location: Tega Cay! Posts: 311	My CEL came on right around 50 miles after I installed JBA's, I put big daddies on and never got CEL again. PM me your address and Ill ship 2 to you for free if you want them. Great condition, like new, 2000ish miles on them. I went long tubes and cam now. __________________ '10 SS/RS, ADM Perf SC RPM Motorsports tuned, Flowmaster catback, Kooks LT Headers, BTR Stage III CAM, CAI, ported TB, New Age Hotrods Tune, Elite Catch can, big worm graphix markers

07-13-2016, 07:48 AM	#4
Dave@Sturgiscamarorally Drives: 2010 ABM 1SS Join Date: Nov 2014 Location: South Dakota Posts: 199	same here... used the big daddies extension when doing my ARH long tubes and high flow cats... never had a CEL. Ran them for about a year until I did cam tune etc... __________________ 2010 Aqua Blue 1SS KWC 3pc forged, Seibon hood, ZL front end, MGW, ARH full exhaust w/ Doug Thorley axle back, BTR4, Roto-fab, LSXR 102, NW 102, 3.91s

07-15-2016, 10:07 AM	#7
ForcFed93 Drives: 2001 2500HD Join Date: Aug 2014 Location: Topeka, KS Posts: 213	I installed SOLO's over the weekend with Big Daddy angled extenders and I've driven it probably 50-100 miles and I haven't gotten a light. __________________ 2001 ECSB 2500HD

07-14-2016, 12:30 AM	#6
G28 Drives: Camaro Join Date: May 2016 Location: Guam Posts: 20	Which extensions did you guys use?

07-23-2016, 10:06 PM	#14
Kendall421 Drives: 1969 Z28, 1982 Z28, 2014 SS/RS/1LE Join Date: Nov 2013 Location: Michigan Posts: 886	All these responses...but nobody asking what he code is. That is the key...what code are you throwing? I ran ARH Shorty headers with Solo HF Cats for a year and never had a code. I now have Pfadt Tri-Y with HF cats and occasionally get a P0151 code. This is the front O2 sensor taking more than 2 mins to get to temp. This can happen with LT due to the added 6 inches the sensor is from the engine. The rear sensors are tuned out, so no codes there. Your likely getting a code from the rear O2 sensors and to fix that I HIGHLY suggest Big Daddy O2 extenders...angled are even better. You will not throw a code again.