question for tuners - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

011silver 2SS · 10-10-2011, 09:01 PM

hypathetical only,,,if you have a tune and upgrade to headers and hi-flos then throw a engine light , (probably the o2 sensor), will the computer try and lean the fuel to get the temps up ? and if the so if you disable the code (after clearing it) will the computer stop trying to adjust and revert back to the tune, what does the computer do when it cant read the rear 02 after its disabled? or does it show normal or just not read it after? thx,,dan.

Lethal Racing · 10-10-2011, 09:10 PM

Ususally it is an O2 sensor. If it is throwing a code then its best to have it checked outand make sure it is not a front o2 sensor code. Some codes will say stuck lean or rich. At this point the tune is out of there is a bad O2. If the rear o2 is turned off properly then the car will not even run the test for them. Then the car is only running off of the fronts at time. Personally I usually plug up the rear o2 with and take them out of the system all together.

Rhino79 · 10-10-2011, 09:17 PM

If it is a front o2 code, most likely its running in open loop and will NOT use any trims to correct fueling. Rear o2's are just the cat monitoring o2's, they need to be deleted out like mentioned above. It will not under any circumstance lean out to warm up faster, it actually is setup to run open loop until coolant temp reaches a certain temp, only then will closed loop fueling occur if the o2's are good.

bluetorp · 10-11-2011, 01:42 AM

An O2 DTC resulting from a header install should not prevent the PCM from entering closed loop operation once the coolant temp threshold has been reached. The codes normally thrown are for slow response and/or low voltage, due to the decreased operating temp of the sensors. These codes will not force the PCM into open loop.

Rhino79 · 10-11-2011, 07:47 AM

The rear o2's won't, if you had a bad o2 that was not responding at all then yes it would force open loop. Slow response codes won't force open loop.

011silver 2SS · 10-12-2011, 08:28 PM

thx for the replys. still trying to learn this computer stuff. aint the old holley carb issues.

mikeSS · 10-12-2011, 08:30 PM

just to make sure, was the tune made for the headers

011silver 2SS · 10-13-2011, 05:23 AM

Quote:

Originally Posted by mikeSS

just to make sure, was the tune made for the headers

no, tune was before headers. tune was with cai and aftermarket cats.

10-10-2011, 09:01 PM	#1
011silver 2SS Drives: 2011 2ss inlaid silver seats a6 Join Date: Sep 2010 Location: new york Posts: 272 View My Garage	question for tuners hypathetical only,,,if you have a tune and upgrade to headers and hi-flos then throw a engine light , (probably the o2 sensor), will the computer try and lean the fuel to get the temps up ? and if the so if you disable the code (after clearing it) will the computer stop trying to adjust and revert back to the tune, what does the computer do when it cant read the rear 02 after its disabled? or does it show normal or just not read it after? thx,,dan.

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10-10-2011, 09:10 PM	#2
Lethal Racing Drives: LSx Performance Specialist Join Date: Jul 2011 Location: Lafayette, LA Posts: 517	Ususally it is an O2 sensor. If it is throwing a code then its best to have it checked outand make sure it is not a front o2 sensor code. Some codes will say stuck lean or rich. At this point the tune is out of there is a bad O2. If the rear o2 is turned off properly then the car will not even run the test for them. Then the car is only running off of the fronts at time. Personally I usually plug up the rear o2 with and take them out of the system all together.

10-10-2011, 09:17 PM	#3
Rhino79 Drives: 2010 Camaro SS L99/Auto Join Date: Jul 2011 Location: Cabot, AR Posts: 2,827 View My Garage	If it is a front o2 code, most likely its running in open loop and will NOT use any trims to correct fueling. Rear o2's are just the cat monitoring o2's, they need to be deleted out like mentioned above. It will not under any circumstance lean out to warm up faster, it actually is setup to run open loop until coolant temp reaches a certain temp, only then will closed loop fueling occur if the o2's are good.

10-11-2011, 01:42 AM	#4
bluetorp Drives: 2010 2SS/RS IOM M6 Join Date: May 2011 Location: Abu Dhabi, UAE Posts: 288	An O2 DTC resulting from a header install should not prevent the PCM from entering closed loop operation once the coolant temp threshold has been reached. The codes normally thrown are for slow response and/or low voltage, due to the decreased operating temp of the sensors. These codes will not force the PCM into open loop.

10-11-2011, 07:47 AM	#5
Rhino79 Drives: 2010 Camaro SS L99/Auto Join Date: Jul 2011 Location: Cabot, AR Posts: 2,827 View My Garage	The rear o2's won't, if you had a bad o2 that was not responding at all then yes it would force open loop. Slow response codes won't force open loop.

10-12-2011, 08:28 PM	#6
011silver 2SS Drives: 2011 2ss inlaid silver seats a6 Join Date: Sep 2010 Location: new york Posts: 272 View My Garage	thx for the replys. still trying to learn this computer stuff. aint the old holley carb issues.

10-12-2011, 08:30 PM	#7
mikeSS Drives: 2015 c7 Join Date: Nov 2009 Location: MI Posts: 7,462	just to make sure, was the tune made for the headers