i have done the airbox mod to my car about 3 weeks ago (also i only drive the car a few times a week). but my car threw the check engine light now and its giving me a lean code. my car is all stock except for the 1" holes in the air box w/ drop in k&n. did anyone else have this happen to them. i have the extended warn on the car 60k and im now at 57k so should i take it in? what if they see the mod? will they void the rest of the warranty? or dose that little mod require a tune for this prob?

 

you could just use a tune mine did the same thing i haven't got a tune yet but it should do the trick

 

i did the same thing before i got the fujita my CEL would come on for a week, go off for a week, come back on and so forth. you can try to take it to the dealer, just make sure to cover as much of the airbox as possible so they cant see the filter.

 

a drop in filter shoundnt void the warranty. i modded my airbox and was kinda conservative with it but still noticed a difference.

plus do you think a dealer is going to go through all the trouble to check your airbox?

 

Yeah, trust me, they will..

 

caus ewhen they get on it and hear it whine 2x as loud they might take a look and it they need to test the maf they might

 

dont worry about it. it is probably just a fluke. i had i/h/dp/stg 2 pulley on the stock tune and never threw a lean code until I went up north and raced on the highway in 30 deg weather. Yes I know that every car is different. since u have modded the airbox it wouldnt be covered under warranty anyways

 

more air in your engine = leaner. It's bound to happen isnt it. Unless you adjust the tune and add more gas itll be lean. Take a picture of you girlfriend/wife/supermodel and put it over the check engine light so you cant see it

 

common sense ftw

you threw a dtc, and you're 100% it's for being lean? it's not just a check engine light and ur assuming it's for being lean? i'm just checking.

also, make sure you didn't over oil that sucker, oil on the maf screws up things. disconnect your negative battery terminal for a few minutes, that resets the pcm. see if it happens again. and dude, throw a hose clamp on the K&N and remove that lil restrictive cover. you have enough plastic around the filter to not worry about rain, and it only blocks airflow.

do that up and it shouldn't come back, unless where you live is cold. and after the warranty is up, go get some injectors and a tune. should run you under $300 for maybe 10 or so HP and no more lean codes.

i noticed after my post, you live in PA. I'm in NY, sameish weather, i just did the airbox mod with a K&N filter about 3 weeks ago myself! no lean codes tho, hence why i said check the maf. get some good maf cleaner, should only run ya $5. gl

 

i know its def a lean code, i have a generic scan tool and my LTFT is way up there. i didnt think that such a minor mod would bring in that much more air. i thought over time the car would just learn and adjust. but anyways it actualy just turned of itself today. i guess ill be watching it closely. thx

 

np. yea, usually with an intake mod of any sort, i like to disconnect the battery to reset the computer. this erases ltft and stft, so the computer can readjust on it's own without taking old calculations into affect, then bitching and throwing a cel from being too far off. the cel will come on as being lean when ltft is -15% from preset conditions. meaning, if 15% more fuel is being used than what the computer has stored in its banks as what the car should be using, the cel comes on.

at first i was doubting you're pulling in that much more air from such a minor mod, i don't have any cels and we have the same exact mod, and near same weather conditions. more whine = good stuff. i guess it does have the potential for that much more air.

you should be fine for the summer, the air is getting hotter = less dense. come the colder weather, the lean code might come back. our stock injectors are near maxxed from the factory, hence their inability to keep up with such a minor mod. do what i'm gonna do... smaller pulley, injectors, some cooling mods, and a good tune. more power AND no lean code ftw

 

yhea my ltft was up around 17%. and now that u say about the temp issue it was saturday night at 1am and it was chilly out and i was flyng down interstate 81. alright its all coming togather now

 

awesome, learning = fun. and i'm shocked to see that you're pullin in that much more air just from this mod, since i did the same thing and my ltft has been logged at 9% max above the default values, i scanned using a usb scan tool and my laptop, i did it on a cold night a few weeks back. by any chance, did you leave any gaps between the MAF and where it sits? how about for the filter, is it fully seated and sealed on the stock filter box lip?

to make sure mine was fully sealed, i took a tiiiiny bit of liquid silicone and smeared a very thin layer on the mating surfaces of the MAF body to where it touches the air box housing, applying it to the MAF rather than the air box housing, this was so incase i were to have a shaky hand and bumped the maf into the opening on the airbox, no silicon would get on the tip. then i did the same to the rear end of the air box lip, slipped the filter on and spun it to work the silicon around, threw a hose clamp on and then i knew for sure i would have zero leaks. i let it tack for an hour and buttoned it all up.

as for now, make sure you don't get that lean code while punching it... lean during WOT = bad news for the #4 cylinder, which i have read gets a bit starved due to our returnless fuel system and it being the last cylinder to receive fuel. you don't want to melt that piston anytime soon i'm sure. i'm sure you won't, sounds like your stock like me, tho i'm getting the ottp stage 1 kit soon so i know my car will be properly fed with fuel. check back to let me know how you made out and if you threw the code again.

 

no with the light went off about a week ago and hasnt come back on yet. i need to stop being lazy and hook up my a/f gauge so i can watch it

 

i have an 07/ss/sc and i completely hack sawed the airbox off. i havent ran into a CEL yet but i also live in south carolina.

 

sorry for the late reply, been busy. yea, temperature and air density will have a big part to play in throwing a DTC. i plan to get tuned and upgraded before winter so i don't run to lean and melt a piston or something, definately a good idea. a little more fuel and air can't hurt