How to Tune Idle in aem series 2
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 Next, we will start adjusting the tables that are the most crucial to your idle. Start by going to your “Idle Target Base Table” and setting it all to 1400 RPM. This way no matter what the temperature of your coolant is, you are requesting that your idle be at 1400 RPM. After you do this you may notice that your current RPM speed may not be at 1400, but your “idle target” RPM should be at 1400. You can see these values in the “Channels- Idle” box in your software. Now, in order to get the RPM you are requesting you have to adjust the “Idle% vs Target” table. This table tells your idle motor what position it needs to be at in order to maintain the set idle target RPM. If your idle RPM is not at 1400 like you are commanding it you can go to the Idle% vs Target table and click + or – on the corresponding dot at 1400 in order to raise or lower your idle. The table below helps illustrate what needs to be adjusted. Once you have adjusted the region that is circled in red and are maintaining an idle of 1400 you can move on to the next step. If your engine does not want to idle at 1400 you need to address the issue that is causing this. Make sure that your AFR is reasonable. AFR should be stable and between 13.0:1-15.0:1. Ideally, you want your engine to idle at 14.7:1. Also make sure your ignition timing is stable. You do not want it jumping from around 10 degrees otherwise your idle will not be stable. Now you can move onto the next step. Set your “Idle Target Base” table to 1300 all the way across and proceed to repeat the steps. Like before go to your “Idle% vs Target” table and adjust the 1300 RPM region until your engine RPM matches your target idle RPM which should now be 1300. Do this with 1200, 1100, 1000, 900, and 800 RPM. You can go as low as you want depending on what your engine will be idling at. Each time you drop in RPM make sure that your AFR is close to stoichiometric (14.7:1) and your ignition timing is not jumping around. At this point your “Idle% vs Target” table may look jagged and not smooth. You can highlight your lowest calibrated dot all the way until your highest calibrated dot and press the letter “H” on your keyboard. This is the hotkey for the “interpolate” function which will make your transition smooth and make your table look similar to the one pictured. Your slope may not be the same as the one pictured so do not worry. You can verify that your tune is good by going back through the different idle targets. Just highlight your entire “Idle Target Base” table and go back to 1400 RPM. If your engine speed jumps to 1400 you know your idle motor position was properly tuned.
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