Long tubes and STFT readings - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

kencam · 09-03-2015, 01:57 PM

I put on some long tube headers with hi flo cats a few months ago.

I took a OBDII reading after noticing a CEL and here are the results:

Bank 1 Sensor 1 : O2 - 0.87v, STFT 0.7%
Bank 1 Sensor 2 : O2 - 0.87v, STFT 99%

Bank 2 Sensor 1 : O2 - 0.935v, STFT 0.7%
Bank 2 Sensor 2 : O2 - 0.675v, STFT 99%

I'm not sure what's going on here, but I don't think a 99% value on a sensor is normal.

Would a non fouler on the rear sensors help?

Dizzy82 · 09-03-2015, 05:36 PM

Are you tuned?

Tenring · 09-03-2015, 06:51 PM

Dizzys question?
It took a couple months to get the CEL?

JD_Alaska · 09-04-2015, 01:41 AM

For what it's worth, disregard your 2nd sensor readings they mean nada with long tubes. If you were in fact tuned your tuner would have tuned them out completely anyway. Your sensor one readings look ok.
You may want to look into a wideband to see what your A/F is looking like at WOT though so you know your engine is running ok and not going lean. Just my .02

JD_Alaska · 09-04-2015, 01:46 AM

Are your LTFT sensor 1 ( both banks) matching or close to your STFT for sensor 1 (both banks)?

09-03-2015, 01:57 PM	#1
kencam Drives: 2010 2SS/RS M6 Maggie Rally Yellow Join Date: Jan 2012 Location: Bucks, PA Posts: 127	Long tubes and STFT readings I put on some long tube headers with hi flo cats a few months ago. I took a OBDII reading after noticing a CEL and here are the results: Bank 1 Sensor 1 : O2 - 0.87v, STFT 0.7% Bank 1 Sensor 2 : O2 - 0.87v, STFT 99% Bank 2 Sensor 1 : O2 - 0.935v, STFT 0.7% Bank 2 Sensor 2 : O2 - 0.675v, STFT 99% I'm not sure what's going on here, but I don't think a 99% value on a sensor is normal. Would a non fouler on the rear sensors help?

09-03-2015, 05:36 PM	#2
Dizzy82 Drives: 2011 1LT/RS A6 RJT SuperCharged Join Date: Mar 2011 Location: 87114 Posts: 3,501 View My Garage	Are you tuned? __________________ Power is worthless without control. *The 2nd* protects the 1st.** BMR sub frame brace, BMR tunnel brace, LSR sways, LSR CM ca & tl, Sphon ExD el, GM tower brace, Megan EZ Streets, Goodridge Stainless Steel Braided brake lines, PowerStop D/S rotors & pads, Doug Thorty Ceramic Shorties, Magnaflow x-pipe, MRT V2.0, KICKER PowerStage sub & amp, Infinity speakers & tweeters, Viteese Throttle Controller, Viteese Paddle Shifters, ACS T2 Splitter, ACS T2 Ports/Quad LED lights, VDI kit, Havoc diffuser, IPF ECU/TRANS tuned, IPF/KPE Supercharged. 364RWHP/297RWTQ

09-03-2015, 06:51 PM	#3
Tenring Drives: 2015 SS/RS M6 Commemorative Join Date: Apr 2014 Location: Arizona Posts: 2,197	Dizzys question? It took a couple months to get the CEL?

09-04-2015, 01:41 AM	#4
JD_Alaska Drives: 2013 Camaro SS Coupe L99 Join Date: Feb 2013 Location: North Pole Alaska Posts: 393 View My Garage	For what it's worth, disregard your 2nd sensor readings they mean nada with long tubes. If you were in fact tuned your tuner would have tuned them out completely anyway. Your sensor one readings look ok. You may want to look into a wideband to see what your A/F is looking like at WOT though so you know your engine is running ok and not going lean. Just my .02

09-04-2015, 01:46 AM	#5
JD_Alaska Drives: 2013 Camaro SS Coupe L99 Join Date: Feb 2013 Location: North Pole Alaska Posts: 393 View My Garage	Are your LTFT sensor 1 ( both banks) matching or close to your STFT for sensor 1 (both banks)?