Then, to better smooth that with the rest of the scale, you highlight the values at 1.26 volts and the next 2 (two) higher cells and press "H" to interpolate the values. In ATR you simply increase the value at or around the 1.26 volt cell by multiplying it by 1.07. If you look in your log while at idle, you will see it is making corrections of about +7 to 8% at around 1.26 volts on the MAF scale. In ATR you are going to open the table for MAF Scaling. Okay the adjustment to idle fuel is simple. If it does it needs to idle some more till it learns its fuel trims and position. It should drop to a stable idle and not fall below target. Wait and let it idle for 3 minutes then give the gas a quick shot to 3000 rpm and let off the gas rapidly. Start the car and do not touch the accelerator peddle, Let it find idle on its own. Reset the ECU, shut the car off and wait 5 seconds. Start the car and fully warm the motor first. Next time yor reset the ECU, Follow the below procedure and I guaranty you will almost eliminate this issue. Other than that you will have to live with it but there is a way to limit the effect or eliminate it completely. The other thing that can effect this greatly is injector latency, but that is not relevant unless you changed your injectors. The closer your fuel trims are to zero at ldle on a reset, the less this happens and the less learning it needs to do. If all else has failed the next place to look is at your MAF calibration. As suggested it wouldn't hurt to check for vacuum leaks because even the slightest leak can cause this. I see this all the time and I have never been able to associate it with any single condition.
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