Adjusting the Throttle on Your FiTech EFI
The FiTech Fuel Injection system has revolutionized the way they approach fuel delivery in classic vehicles. With its advanced features and user-friendly interface, it has become a popular choice among automotive enthusiasts. One critical component of the FiTech system is the Idle Air Control (IAC), which plays a crucial role in ensuring smooth idling and overall engine performance. In this article, we will delve into the significance of IAC and provide a step-by-step guide on how to easily set it up effectively for optimal performance.
Understanding the Idle Air Control (IAC) Steps
The Idle Air Control (IAC) system is responsible for maintaining the correct amount of air entering the engine during idle. It adjusts the throttle plate opening to regulate the air-fuel mixture and maintain a stable idle speed. The IAC steps, often referred to as "minimum air," determine the number of steps the IAC motor should move to achieve the desired idle air control.
The IAC steps are essentially a reference point for the FiTech system, allowing it to calculate the proper amount of airflow required to maintain a consistent idle. Accurate IAC steps are essential to ensure the engine runs smoothly at idle and prevent issues like stalling or rough idling.
What You Will Need:
-Easy access to your connected FiTech Handheld Controller at the throttle body
-A Philips Head screwdriver
Setting Up IAC Steps on FiTech Fuel Injection System
Step 1: Warm Up the Engine
Start by warming up your engine to operating temperature. This ensures that the engine is in a stable condition and ready for adjustment.
Step 2: Go to Initial Setup on your handheld controller
On the main menu of your handheld, find “Go-EFI Initial Setup” and select it. Now go to “Idle Setup”. From there scroll down to “Idle screw set TPS 0”. Using the right arrow on the directional pad, change the mode to “All Zero”. Press the “OK” button on the directional pad to send to the ECU. This is going to lock your throttle position to zero.
Note: In order to submit the value change when making modifications using your handheld controller you must press ‘OK’ on each line to send that value to the ECU, if this is not done the values will not be saved. When you see the message “Sent to ECU Succeed”, you have successfully sent and saved the values to the ECU.
Step 3: Turn off your fans
You will want to do this with no fans on and momentarily disable your fans during this process. To do so, go back to the initial setup, select “Fan 1 Setup”, select “Option Fan 1 Enable”, using the right arrow on the directional pad change the option to “disabled”, and press “OK” on your directional pad to send to the ECU, you will see the message “Sent to ECU Succeed”.
You are going to make this adjustment quickly with the fans off and do not forget to turn your fans back before you complete the entire throttle body adjustment.
Step 4: Adjusting your throttle/IAC Steps
Note: You will need your screwdriver for this step and make sure you have your handheld controller visible near the throttle body during this process.
Back in the Dashboard under the main menu, scroll down to watch the IAC steps as you make this adjustment. The goal is to get the IAC Steps Value between 3-10.
With the engine running. Use the throttle adjustment screw on the driver-side front of the throttle body to adjust the throttle and get the IAC Steps on your handheld between 3-10. Turning the screw clockwise will open the throttle and counterclockwise will close the throttle. If your values are higher than 10 you will want to open the throttle, if your values are lower than 3 you will want to close the throttle. Continue to adjust until your values are anywhere between 3-10. Note, the more radical the cam the more it will fluctuate, so don’t be afraid if you don’t hit the number perfectly.
Step 5: Turn Fans on
Now that you have successfully set the idle to the desired value, you can go back to the “Fan 1 Setup” and enable your fans again. Do not forget to press ‘OK’ on the directional pad to send it to the ECU.
Now You Can Hit the Road
Setting up the IAC steps on your FiTech Fuel Injection system is a crucial step in achieving a smooth idle and optimal engine performance. By following the step-by-step guide outlined in this article, you can fine-tune the IAC steps to suit your engine's requirements. Remember to make small adjustments and carefully observe the engine's behavior throughout the process. With proper IAC step configuration, you'll experience a responsive and reliable fuel injection system.
You can view a video on adjusting your throttle below:
