Fwi lean code
it's caused by the fact that the flow of air going into the MAF is altered. Correct MAF calibration is very important to proper fueling. What happens is that more air passes through the sensor than what is being measured by the maf, creating a lean condition. The computer can and does learn to compensate but some air boxes throw calibration so far off that it forces the computer to add way more than normal amounts which triggers a lean code.
well, it could be a combination of the FWI and winter gas. Many other things could cause a lean code as well. The only way to know if it's the airbox causing it is to put the stock airbox on and see if the fuel trims go back in line. Or in your case see if the code goes away.
i have the same thing happening to me right now I have been told by everyone every Lew (diablotuner) our cars run lean from the factory and that put and cai or a fwi make it even worse. I just ordered a stock airbox from a member and will see how everything works out. everyone also said to either do that or get it tuned with a handheld or something
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Five Reasons the Camaro Was the Most Pivotal Player in the Pony Car Wars 2.0
Brett Foote
10 Reasons the LS7 Is GM's Most Extreme Naturally Aspirated V8 Engine Ever
Verdad Gallardo yea my will stay on for a few days (normally the coldest days) then go out a few days then back on as soon as i get the airbox i will be putting it on and see what happens and let you know
TECH Apprentice
Joined: Nov 2010
Posts: 307
Likes: 0
From: bear,delaware
i have the same thing happening to me right now I have been told by everyone every Lew (diablotuner) our cars run lean from the factory and that put and cai or a fwi make it even worse. I just ordered a stock airbox from a member and will see how everything works out. everyone also said to either do that or get it tuned with a handheld or something
The fuel trim is the percentage fuel added (+trims) or removed (-trims) based on instantaneous and long-term feedback from the O2 sensor when the vehicle operates in closed loop.
Positive trims indicate that the vehicle is flowing more air than the MAF (or VE table) thinks, so fuel is added to eliminate a lean condition.
The solution is to log fuel trims against MAF frequency and then adjust the MAF table by the average trim. Many people adjust the trim by 1/2 the average amount to avoid overshooting, and then go back and do another log.
We have long-term and short-term trims, so you have to either disable the long-term trims while logging, or log both and add them together to see what all the trims are doing to your fueling. I have the LTFT permanently disabled in my tune.
Positive trims indicate that the vehicle is flowing more air than the MAF (or VE table) thinks, so fuel is added to eliminate a lean condition.
The solution is to log fuel trims against MAF frequency and then adjust the MAF table by the average trim. Many people adjust the trim by 1/2 the average amount to avoid overshooting, and then go back and do another log.
We have long-term and short-term trims, so you have to either disable the long-term trims while logging, or log both and add them together to see what all the trims are doing to your fueling. I have the LTFT permanently disabled in my tune.
from what I can gather from your last post, I think your asking about fuel trims and how to adjust them. If your MAF/VE/ injectors etc are not calibrated properly then the computer will be wrong on it's initial guess on how much fuel to add to get the proper mixture which is called stoich (14.68:1). Fuel trims are also refered to as long term fuel trims (ltft) or short term fuel trim (stft). In a nut shell its the computer's attempt to adjust the fueling back to stoich based on O2 sensor feedback. By adding the ltft and stft you get the percentage of fuel the computer is trying to add/ subtract. Ideally you want your trims to be zero or as close to zero as possible. On your car, in it's current state, you adjust the maf curve to get your trims back to zero. If you need more info than that maybe you should PM me.
I appriciate the info I have never tuned anything without a 4bbl so that being said this is what I'm wanting to do
Remove the park rev limiter
Remap the maf
And reduce the shift time servos
An mess with my fans(it's a desert out there)
Should I invest I'n the Hp tuner or will the superchips tuner do all this
Remove the park rev limiter
Remap the maf
And reduce the shift time servos
An mess with my fans(it's a desert out there)
Should I invest I'n the Hp tuner or will the superchips tuner do all this