What would cause a 7% split in fuel trims ?
What would cause a 7% split in fuel trims ?
Air leak...no fuel...too much fuel
could be what your PCM thinks your fuel needs to do to meet your o2 swings in CL. as they oscillate your adding/subtracting fuel so your PCM for what ever reason is needing to add or subtract that much to get it to swing correctly.
2010 CTS-V A6, Airaid CAI, 2.4 pulley, ported ls7 throttle body, ID850s, ARH 1-7/8" headers and X pipe, TR7IX plugs, MSD wires, Elite catch can, ZL1 lid and Track Attack HX
Inconsistent injectors, air leaks (exhaust or intake side), O2 sensor issue maybe
Post a log and tune if you want help
VCM Suite V3+ GETTING STARTED THREADS / HOW TO's
Tuner by night
CPX Tuning
2005 Corvette, M6
ECS 1500 Supercharger
AlkyControl Meth, Monster LT1-S Twin, NT05R's
ID1000's, 220/240, .598/.598, 118 from Cam Motion
2007 Escalade, A6
Stock
First thing I'd look for is an exhaust leak near the O2 sensor on whatever bank is reporting leaner
Could just be injection timing if you've been playing with it any or have something like a cam for instance... If not this - then air leak whether on intake or exhaust side or the injectors themselves... Then contaminated O2's and on and on...
2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80
~Greg Huggins~
Remote Tuning Available at gh[email protected]
Mobile Tuning Available for North Georgia and WNC
Is a 7% split worth doing anything about? Will it hurt anything just to leave it be ?
What are the details on your setup?
Post a log and tune if you want help
VCM Suite V3+ GETTING STARTED THREADS / HOW TO's
Tuner by night
CPX Tuning
2005 Corvette, M6
ECS 1500 Supercharger
AlkyControl Meth, Monster LT1-S Twin, NT05R's
ID1000's, 220/240, .598/.598, 118 from Cam Motion
2007 Escalade, A6
Stock
Cam,E-force supercharged L9H topping out at 12lbs boost, headers,ID 850's, pre- boost meth,ported 90mmTB
7% is pretty substantial, and worth looking into. At WOT, having 7% difference in fueling is the difference between an 11.5 and 12.3 AFR if your PE fuel trims lock in with a 7% difference. It's tough to nail down fueling if the banks are that different.
Reply With Quote