turbocivic2000

All of a sudden today I noticed that my car was running really lean. It would stay stoich what I hit the gas hard and stay stoich when I was idling. But when I let go of the gas it crashed to lean and while I was drive at a steady pass in 3rd gear. I have no vaccum leaks. I was playing with the idle air screw on the top of the throttle body because the car was idling funny, but that's it. Also I tried resting the ecu and the check engine light came on right away. I have a brand new honda O2 sensor so I don't think its that. Usually when I hit the gas it goes rich, when half way in 3rd gear stoich, annd when I let go of the gas it goes to lean and then the light goes off until I hit the gas again. Does anyone have any input?

I'm running a T25 turbo, vortech fmu, 255lph fuel pump, stock fpr and injector, irdium plugs and msd sci on a D16y8

B18PoweredCivic

Up your fuel pressure and try getting some injectors

BudaKai

How are you fooling your MAP sensor?

Familycarfromhell

if your running low boost 8-9 psi and you have a stock motor. your mods are
255 f pump and fmu you should have plenty of fuel. the 255 f pump runs your pressure stedy at 50 psi. so you have more than enough fuel. maybe your flooding
your motor and tricking your o2 sensor? please dont tell me you have a auto meter A/F meter. those suck and are better off on the christmas tree with all those lights. get your self a defi d gauge they are actual number readings pretty acurate
if you ask me and cheep 118$ and they match the si cluster. they give you a
real readding!!

BudaKai

The only way to get accurate reading on AFR is with a WB o2. I think he messed up with his sensors, or one went bad on him.

swrdply400mrelay

If you have one like an autometer, those just pretty much tell you if your O2 sensors are good or bad. Also how much boost are you running?

CzanSOHC

with the defi d series air fuel meter, you are still using your stock oxygen sensor so the readings are no more accurate than the autometer guage.

technine

Isn't it supposed to go lean when you let off? I don't know about the 3rd gear lean though. Check your fuel pressure and the entire fuel setup to see if it's hooked up and working right. All vacuum lines and fuel lines and maybe your fuel pump connections. Did you ever try an inline pump? People say you need one get the fuel pressure you need, although some people just have intanks like a buddy of mine, but he runs lean also and doesn't have the power he should.

Familycarfromhell

yea but at least you can see whats going on insted of un acurate lights.
i had a auto meter, didnt do much for me? never hit rich for the turbo set up
didnt belive it any ways because the plugs were blackty black.
i'm not saing that defi are the best nor the greddy ones but when your having these kind of problems, the last thing on your mind is spending a 1,000$ on a
WB set up. if it were me i would spend 50 more dollars and get some what of an actual readding.
**** i dont know? turbo hondas suck any ways, problems,problems and more problems.
i wish i would have bought a house insted