jameswwt

Hi,
can someone shed some advise as im having problem with idling & stalling issue with my Evo 6 ecu.

Been increasing the:
1) Desire Idle RPM-Neutral = 1203rpm 77 deg / 1203rpm @ 82 deg
2) Desire Idle RPM with AC on = 1203rpm All

Its doesnt help at all.

When AC off the stalling stop but the RPM will deep til 500~600rpm when throttle lift off especially on 1st & 2nd gears.
Idle is stable when AC is off

When AC on its stall everytime as the rpm can be at 3000rpm and deep til 300~400 and stall.
Idle is rough/inconsistent rpm when AC is on

Tried without using stock ROM without Ceddy feature but it still the same.

Some might think its my ISC dirty or faulty but when i switch back to my PFC ecu, no idling or stalling issue at all when AC on or off.

Im using Trubosmart Race Port BOV

Pls help.

Thanks

CDrinkH2O

iTrader: (7)

Post up the ECU ROM version you are using, and a log with RPM, IACV Demand, and IACV steps. If the steps are increasing but RPM staysthe same, there is something wrong. This will help us to diagnose the cause. I had a similar problem which I traced to a worn IACV valve. The little plastic ribs that stop the cone from turning get worn down and the stepper motor can no longer open the valve. Once I fixed it everything went back to normal.

jameswwt

Hi CDrinkh20,
my Ecu ROM version is :
Internal ID : 2443002
Memory Model : H8539F

But how come when im on my PFC ecu i dont have this problem?

Its really making me crazy.

sound77

Hi,

Are you on bigger cams/Injectors ? what size ? Also your PFC is it D or L jet?

I was on the same boat when I changed from PFC to stock ECU, But now way much better !! could say what steps I have done with mine but I don't now if going to be OK on your car as well.