Hello, at first sorry in advance for maybe misspelling somethings and please bear with me i am new here .

Well my problem is i Imported a EVO 5 GSR from japan and have some engine problems.

Car starts fine and idles normal unless it gets warm, once fully warmed up it started to idle between arround 1100 and 1600rpm and was constantly bouncing between these numbers.

i changed o2 sensor, sparkplugs, IAC and some hoses and had no changes. With Evoscan i tried readjusting the BISS, result was completly screwed in the idle went down to 1100-1200rpm and stopped bouncing but it wont go lower than that. maybe some of you can see something in the Log, check O2feebacktrim dont know if thats normal.

My second problem is boost related, when i do a pull and boost gets to arround 0.8 bar (that should be the stock figure) it starts stuttering, dont know if fuel cut or something like this. when i keep pulling while stuttering the boost will go to 1.4 bar or higher but the stutters will get worse and the car is not really accelerating anymore unless i let of the pedal. Car runs really great until it hits kind of too much boost. Maybe the stock BoostControlSolenoid, dont know. Please check WGDC in the logs, i have no clue on how these numbers should look.

Sadly from what i know but maybe some one of you can enlighten me, my evo dosnt have a map sensor so i currently cant log boost until i get one and programm it in evoscan.

The Engine is stock except of turbotimer.

I hope the logs are of any help.

 

No one here has any idea ?

 

You need to add load, boost and wide band O2 values before we can help you diagnose this..

 

Okay thanks, i thought maybe someone encountered this problem befor and knows something. i was planing on getting wideband and map sensor for tuning anyway. but currently working on just getting the car street legal here in germany so i will need some time and getting parts here is kinda difficult.

 

might be the maf sensor