Wideband running rich - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Austin51 · 09-11-2018, 08:52 AM

Hey guys, new to the forum. I’ve got a 2010 Camaro SS. The car has stock internals, long tube headers no cats, CAI, polluter cam package, and is a m6. I just put a nitrous outlet plate kit on it and sprayed a 100 shot. I’m running the a lnc2000 to pull timing and the winmax. Wide band showed the car running rich so I didn’t spray it anymore after 2-3 times. Before ever spraying the car ran at 12.6 AFR on motor. Now it is running at 11.5 on motor. Does anyone have an explanation as to why the AFR has richened up like this? Thanks!

ZL1C7 · 09-12-2018, 01:35 AM

I think the first thing I would check is making sure your not taking out timing when the NOS system is not activated. If by chance it is, the A/F will be richer. Also, how much timing were you pulling? Also make sure no fuel is getting past the fuel solenoid when not activated (partially stuck)

Juiced1 · 09-12-2018, 08:42 AM

There are several tables that will dump extra fuel on your tune. Did you tune your car yourself? It might just be the cat overtemp table dumping fuel, if you are catless you can turn that off and see if you fixed it. Also like ZL1C7 mentioned, check that fuel solenoid. I haven't run into any fuel solenoids getting stuck but I have seen a couple of nitrous solenoids sticking open.

Austin51 · 10-28-2018, 08:44 PM

I did not tune the car myself. I’ve taken the nitrous completely off the car and it’s still running rich. I was pulling 4* of timing when spraying. It’s catless. Could an exhaust leak where the headers meet the midpipe cause my o2’s to be reading lean and making the car add fuel?

Pro-tuned · 11-20-2018, 12:25 PM

Any exhaust / vacuum leak will alter AFR. Check LTFT are they reading the same? I would guess not.

09-11-2018, 08:52 AM	#1
Austin51 Drives: 2010 Camaro 2SS Join Date: Sep 2018 Location: North Carolina Posts: 3	Wideband running rich Hey guys, new to the forum. I’ve got a 2010 Camaro SS. The car has stock internals, long tube headers no cats, CAI, polluter cam package, and is a m6. I just put a nitrous outlet plate kit on it and sprayed a 100 shot. I’m running the a lnc2000 to pull timing and the winmax. Wide band showed the car running rich so I didn’t spray it anymore after 2-3 times. Before ever spraying the car ran at 12.6 AFR on motor. Now it is running at 11.5 on motor. Does anyone have an explanation as to why the AFR has richened up like this? Thanks!

09-12-2018, 01:35 AM	#2
ZL1C7 Drives: 2023 SS 1LE 10SPD/2015 SS 427 Man Join Date: Aug 2015 Location: Sacramento Area Posts: 803	I think the first thing I would check is making sure your not taking out timing when the NOS system is not activated. If by chance it is, the A/F will be richer. Also, how much timing were you pulling? Also make sure no fuel is getting past the fuel solenoid when not activated (partially stuck) __________________

11-20-2018, 12:25 PM	#5
Pro-tuned Angewendet Ingenieur Drives: 14 Camaro ZL1 Join Date: Apr 2015 Location: USA Posts: 401	Any exhaust / vacuum leak will alter AFR. Check LTFT are they reading the same? I would guess not. __________________ ———— LQ9, Iron Block, Forged internals, 408CI, Jannetty custom cam, TS short block, Whipple, Hardened Jackshaft, PRC 260, 2X3 Dynatech Full Competition, HF Cats, CAI, NW 103, Chee, ID 1300, COPO Breather, MSD, Fore Dual Pump, ultratorque, E85, dual Meth, True Trac, 3:45, 1500hp axle-shafts, DSS CF, BMR, custom Pearl/Candy paint by Jaidah.

09-12-2018, 08:42 AM	#3
Juiced1 Account Suspended Drives: 2012 2SS CAMARO 45th Join Date: Apr 2011 Location: St. Charles, IL Posts: 18,663	There are several tables that will dump extra fuel on your tune. Did you tune your car yourself? It might just be the cat overtemp table dumping fuel, if you are catless you can turn that off and see if you fixed it. Also like ZL1C7 mentioned, check that fuel solenoid. I haven't run into any fuel solenoids getting stuck but I have seen a couple of nitrous solenoids sticking open.

10-28-2018, 08:44 PM	#4
Austin51 Drives: 2010 Camaro 2SS Join Date: Sep 2018 Location: North Carolina Posts: 3	I did not tune the car myself. I’ve taken the nitrous completely off the car and it’s still running rich. I was pulling 4* of timing when spraying. It’s catless. Could an exhaust leak where the headers meet the midpipe cause my o2’s to be reading lean and making the car add fuel?