Lean under any boost..

[craziloki]

A few years ago I bought a GSX from a dealer with a few mods. From the get go the car had fuel-cut. After cracking an exhaust manifold, replacing and adding 16g and 255 fuel pump. Had leaning problems ever since. AS SOON as car goes into boost, not high boost any boost. (1psi on Autometer) wideband goes to all the way lean. (nothing wrong with the turbo) Any thoughts?

Stock Injectors
255 in tank
small 16g

Waiting to install SAFCII/EVO injectors until this issue is resolved

 

[d2james88]

Try a boost leak test and clean and check your injectors. Also check your maf I changed something on my 3000gt vr4 once and left the maf unpluged on acident and it did something similar. Hope your get it figured out good luck.

 

[donniekak]

Run a vacuum line directly from the manifold to the fuel pressure regulator and see if it fixes your problem.