rb25 lean on wet cold starts

[dee242]

hey my rb25 s2 runs very lean under light acceleration and cruising under boosting its fine and it only does this when the air is damp on coldstarts car also runs rougher

[99_SI]

Sounds like a vacuum leak

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[dee242]

where abouts do you think

[99_SI]

Need more info :AFR when that happens and when it's hot at idle, mods, tune, mileage? Check the basics like O2 sensor voltage if you can find someone with a scan tool or Consult , MAF, air filter, fuel filter , fuel pressure?

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[dee242]

93k for mileage
mods - turbo back exhaust, boost controller,intake, decat
fuel filter was just done, fuel pressure not to sure using stock fuel rail n stock fuel pressure regulator, my 02 sensor is unplugged maf is clean
afr when its hot at idle is usually 13.7 - 13.9

[dee242]

https://www.youtube.com/watch?v=zECvNvzu8YY video of it cruising when it warms up runs normal

[dee242]

https://www.youtube.com/watch?v=zEz0nKSCFQQ

[future_R34]

Sure your wideband is reading right? Not trying to **** on you, but it looks Pretty shady with the zip ties. Have you tried doing a free air calibration?


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[dee242]

its reading correctly u can also feel a difrence when it starts to lean out

[dee242]

the units brand new and aem states that their sensor doesn't need a calibration the sensor went in not to long ago

[future_R34]

rb25 lean on wet cold starts

Nissans run rich from factory.... But that's wild. Why have you unplugged the 02 sensor? Notice engine running warm at all?
Where did you install the bung?


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[dee242]

I unplugged it to install the wideband. I will put it back in i just haven't gotten around to putting another bung in the exhaust. Anyways its in stock location i got a tomei turbo elbow and its just installed in the elbow i know that it should be a meter away from turbo but but this is temporary and no runs normal or even a slight cooler after front mount install.

[future_R34]

Your gonna toast the Wideband sensor there. You need to get it around where the cat is located. And if your factory o2 sensor is unplugged, 90% sure that's causing your fuelling issues.

Get it all hooked up correct and see what happens from there


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[dee242]

okay will give that a try

[dee242]

so i put in the new sensor car seem to run better now only thing is i get an occasional hunting idel