What's up everyone? So was having an idle issue after changing out my IAC so getting on the laptop and making some small adjustments to the "idle base positions" and for some reason there is no change happening. I can adjust the BISS and that will help change idle, but I want to make sure the IAC is working like it should when the car is cold as in the 1st start of the day, I will need to hold the throttle up for at least 5/7 mins, so the car won't die!

Once the car is fully warmed up, I can let it sit at idle and never even touch the throttle. driving and coming to a stop and idle comes down just like it should! This is only on cold start. What am I missing? Also, for hot start if I drive the car to the store and go back to the car say after 5/10 mins, I will need to bump the throttle a couple times before the car will idle by itself again. Let me know what I can do to change this idle.

There are no Boost leaks I have checked many times at this point I am kind of lost!

 

I would start from scratch with the base map for idle on cold start. Turn off all the feedback and see what steps and rpm the car likes. Also play with the fuel_cool temp table In the lower regions as it appears you have a cold start issue. You may need to play with timing also.

 

The car is already tuned but the real issue is that any adjustments I make to the "base idle positions" for coolant temp and idle RPM the ECU will not do anything. Idle feedback is all off. But again no matter what I do throttle needs to be held for a while until there is a little bit of temp but NO matter what the RPM is idle base position will not change. Timing is set at 16* I set it down to 14* and still no different? I will make some adjustments to the Fuel cool table and see what I can get out of it.

 

Post some screen shots of your idle tab tables or send me a log set of your startup and I can take a look.

I spent a great deal of time on my Evo8 with idle and cold start and hot starts. It was never as good as the stock ECU but close.

I assume you declined your iacv per the instructions correct?