Inside this menu you will see an option called DFCO Return fuel, this number represents the amount of fuel the system will inject when it you start to give the vehicle throttle again. You would make changes starting in increments of 10, to the temp range that you are finding the issue to reside in.Bogging/engine loads up/slow to respond: If the vehicle is bogging (when you step on the throttle and the engine is slower/sluggish to come up to a higher rpm) this is normally caused by over fueling. Accel pump is used for any normal throttle input, Fast Accel is for any fast throttle inputs or Wide Open Throttle.Hesitation: If the vehicle has a hesitation (when you step on the throttle and the engine does hangs and/ or almost dies and then suddenly take off) this normally is a lack of fuel so you would fix this by increasing the Accel Pump (for normal throttle input hesitations) or Fast Accel (for fast throttle or WOT inputs). These setting adjust how much fuel, at varying temperatures, the system injects when you accelerate. You will see a menu with multiple different settings, you need to focus on the Accel pumps (20f, 65f, 170f) and Fast Accel (20f, 65f, 170f). To start with turn the key to the on position and then find Go EFI Tuning on the main menu and press enter. A good starting point is to change the settings in intervals of 10 to find which way you need to adjust the system to work better.Accel pump/ Fast Accel adjustment:If the system is having a hesitation or bogging issue, and you IAC steps are between 3-10 at warm idle, then your next step would be to adjust the accel pump function to increase or decrease the fuel added on acceleration. Changing these settings should help with your start up issues along with setting the IAC. For cold starts add or subtract fuel from Crank fuel 65f, for hot starts add or subtract fuel from crank fuel 170f. There you will see three cranking fuel selections. Then select it, once in this menu highlight one of the backup files you wish to save to and then either press OK on the screen or push the joystick IN and it will save all your current settings and parameters.Cranking fuel adjustments:With the key on go to the Go EFI Tuning menu, find Crank and Warm up. Then find Read Cal from ECU on the main menu. You can also copy and paste these files and send them to our technicians to look at as well.Save your current settings and tune:To save a tune first turn the key to the On position, not running.
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