If you want to keep your car’s engine running smoothly, using a fuel injector cleaner machine is essential. These tools help clean and test your fuel injectors, ensuring they’re working efficiently. A fuel injector cleaner removes dirt, carbon buildup, and other deposits, while the tester checks the performance of each injector to make sure it’s delivering fuel properly. Keeping your injectors in top shape improves engine performance, fuel efficiency, and overall vehicle health.
How to Use the ANCEL AJ400 Fuel Injector Tester and Cleaner
Step 1: Prepare Your Injector and Device
Start by connecting the injector to the ANCEL AJ400. The device comes with all the necessary connectors, so simply attach the injector to the machine.
Step 2: Choose Your Test or Cleaning Function
The AJ400 has several functions to choose from. Here’s what they do:
Ultrasonic Cleaning: This function uses sound waves to clean the injectors by breaking down carbon and other deposits. It’s a gentle but effective cleaning method.
Resistance Test: This checks the resistance of the injector, helping you determine if it’s functioning properly. If the resistance is too high or too low, you might need to replace the injector.
Uniformity and Sprayability Test: This checks how evenly each injector sprays fuel. It helps ensure your injectors are distributing fuel properly, which is crucial for engine performance.
Leakage Test: This checks if the injectors are sealing correctly under pressure, ensuring no fuel leaks.
Injecting Flow Test: Measures how much fuel the injector sprays in a fixed amount of time, usually 15 seconds.

Step 3: Let the Device Do the Work
Once you’ve selected the test or cleaning function, the machine will begin the process. For ultrasonic cleaning, it uses sound waves to clean the injector, removing carbon and debris. For tests like the resistance or flow tests, the machine will give you a quick readout on its screen, showing you whether the injector is working properly or not.
Step 4: Review the Results
After the test or cleaning is complete, the device will display the results on the screen. If everything is working fine, you’re good to go! If the test shows issues, such as high resistance or improper fuel flow, the injector may need to be cleaned more thoroughly or replaced.
Step 5: Take Action
Based on the results, you’ll know whether your injectors need more cleaning or if they need replacing. If the flow rate is off, you can clean the injector again using the ultrasonic function. If leakage is detected, the injector might need a new seal or to be replaced entirely.
Using the ANCEL AJ400 fuel injector tester is a great way to ensure your car’s injectors stay in peak condition. It saves time, reduces the need for harsh chemicals, and helps you avoid costly repairs down the line. Plus, it’s super easy to use, even if you’re not a mechanic.
With its ultrasonic cleaning feature and precise tests, it ensures your injectors spray fuel evenly and efficiently. Keeping your injectors clean and functioning well improves fuel efficiency, reduces emissions, and keeps your engine running smoothly.
Final Thoughts
The ANCEL AJ400 is a powerful for anyone looking to maintain their vehicle’s fuel injectors. By following the simple steps to test and clean your injectors, you’ll improve performance and extend the life of your engine. Whether you’re a professional mechanic or a DIY enthusiast, this device is a must-have for keeping your car in top shape.