If you do not have the donut gasket, but you are using an evo8 stock o2 housing and an evo8 stock downpipe, then yes, you have a leak there. Air is being introduced into the exhaust system as the o2 sensor meters the air and is throwing the code. I think mine might be intake related, because my values are way off, even though the o2 sensor's numbers look right. So, I think I have a boost/vac leak somewhere and will try to find it this evening. I really do think I made it worse with my boost leak test, but here's hoping i can fix it.

Easy way for you to check, take some vacuum hose, and put one end to your ear, and the other to your downpipe connection, and listen for fub fub fub of air coming out. You might even be able to feel a leak with your hand, as the air escapes, but be careful not to burn yourself.

A boost leak test wouldn't hurt you either, just make sure to only use like 10 psi or so...not too much

Oh, and yeah, I think when the car is warming up, it's in closed loop, so it's normal to run rich until it's warmed up.

 

Well im using the nvidia 02 housing, its not stock, idk how to spell it, but yeah i will check for that tonite as well. I prob do have a leak there, seems like the two codes are related to eachother. Hopefully if you fix one code the other will fix as well. I bought a new 02 sensor just incase. Also i dont even have a rear 02 sensor installed.. i cut the wires a long time ago when i was dumb and after found out once you cut the wires it screws up the readings. How do i disable the rear 02 sensor? i know its periphery bits or something like that, but im unsure of how to exactly do that with my rom? Cuz i have always had the codes for low voltage rear 02 sensor as well and with the evo rom i know there is a way to completly disable it, i would like to use it for my evoscan wideband logging if i can disable it

 

Yeah, I dunno man. you arent technically speaking using an evo rom, so I'm not sure. I know it's very easy in the pure tephra rom, but I have never even opened the auto lancer gta rom, so I couldn't tell ya. I think roadspike may be the only one who knows actually.

 

Its not the GTA rom tho its Link62 lancer ES auto trans settings in an evo rom or something like that, i belive the GTA rom didnt work, or there was something wrong with the settings or something, i would have to go back and find the page in the evo rom flashed to lancer ecu thread, Ya i know what you mean though by its different, hmm ill have to do alot of research then. If you find out any more info on the codes LMK, ill do the same, im going to do some testing and troubleshooting tonite

 

Oh, and my fuel trim for cruise seems to be maxed positive as well...stock injectors still, so I'm definetly thinking my problems are intake mixing with "unmetered" air. How are your fuel trims, I cant remember wha tyou said, the short and mid ones, not the o2 feedback.

 

Mine are maxed as well LTFT mid was at 12.5 and LTFT low was at like 11 something, i think we both have the same situation happening here

 

Actually. looking at my most recent log, low was 10.74 and mid was 4.88!!

EDIT: that was a pull, my latest cruise was LTFT low: 6.25 LTFT mid: 10.55 with stock injectors and injector letency at 232 Keep in mind this is right after a re-flash, so on my way home from work, highway 28 miles at 65MPH for about 20 min or so ill record trims and report back at 5:45ish

 

That sounds very similar to my trims...I think the leaks are throwing the trims off though, so they may not be 100% accurate anyways.

My Emissions vacuum control valve appears to be leaking some boost. Here's the device I am talking about.

http://www.partsgeek.com/gbproducts/...ek+Google+Base

Is that normal, should I replace it, etc etc.

 

Hmmm...ill have to check mine as well.. thats interesting, im guessing its nor normal for it to be leaking some. Here is my cruise log... Trims are way off man