The function of your diesel fuel injection system relies on careful maintenance. Fortunately, much of this maintenance you can do at home. By testing your fuel injectors at home, you can determine when you need to replace them. Then, if you know how to change injectors, you can install these replacements at home as well. Follow these steps to test your injectors for function and condition.
Step 1: Gather your tools.
To test your injectors, you will need only a few tools that you likely already have in your home. First, you will need to find proper safety gear, including gloves and eye protection. For your actual mechanical tools, you will need a foot-long metal rod or a screwdriver. You will also need an automotive test light.
Step 2: Use your senses.
Start your car’s engine. Take your metal rod or screwdriver and place it on a fuel injector. Carefully lean your head close enough to the rod so that you can hear its vibrations, but not so close that you are near the engine. If the injectors are activating, you should be able to hear a clicking sound.
Step 3: Switch on your battery.
Next, you need to check the system’s electrical connection. Switch the engine off so that it is not running but the battery is still activated. The radio, lights, and other electronic features should be active but not the engine.
Step 4: Use a test light.
Connect the clip of your test light to the negative terminal of your battery. Then, take the pointed tip of the test light and touch it to the small bit of exposed wire. The testing light should light up when it touches the wire. Repeat this on every injector.
Step 5: Decide on a next step.
Once you determine whether your injectors are functioning or not, decide if you are going to repair or replace them. If you know how to change injectors, perform this process at home. If not, bring them to your mechanic.
Remember that there any many different factors that can cause injectors to fail. For example, two major deposit buildups, external and internal injector deposits, often cause them to not function. Try to identify the underlying issue so you can prevent a failure in the future.