So ill try to make as simple as it can be, the problem is running really rich (less then 10 AFR) while spooling till like 4500rpm, then it goes to 11.5~ like i adjusted and the car starts to accelerate.

With 10- AFR, i got a spooling like a gt35r, it is simply not spooling as it had to be due to high fuel. It was like 12,5-13 before.

At crusing, everything is fine 15~ afr, but when i do WOT it goes 10afr and stuck at 10 till 4500-5000rpm, then it came back to 11.5~ and the car starts to accerate as it should be.

Well i got no idea why this is happening atm, the car is stock except cutout, hks filter and my tuned maps, everything was fine before i did an accident (but i just hit the rear side of the car, front side had only some scraches and the licp was damaged, and i changed it with the new oem one)

I tried different maps, all was acting same, **** rich spooling with normal high rpms.

Anyone got any suggestions? Might it be mivec stuck ? I seriously got no idea why it works normal at high rpms and bad at spooling...

 

Change your plugs lately?

 

Nope but the symptoms shows me that its because of the fuel pressure regulator or fuel pump, ill check both of them tomorrow, ll announce the results right after it.

 

I found that my fuel pump assembly gasket is worn, replaced it, problem fixed.