How to test diesel injectors with multimeter

I have tested them in the following way: with the engine running (usually pretty rough if you suspect a failed injector ) unplug an injector. If the engine gets a lot rougher then that injector is fine, plug it back in and move on to the next one. How to Test Fuel Injectors In this Article: Article Summary Listening for Bad Fuel Injectors Ensuring the Injectors Are Receiving Power Checking the Trigger Circuit for the Injectors Community QA The fuel injectors in your vehicle are designed to spray fuel into the cylinders of your engine where it is combined with air and compressed before being ignited by the spark plug to produce power. Quick and easy way to test an injector. Please note this is not 1 so further testing may be needed.

Using a Multimeter to Test Fuel Injector Resistance Ohms.

Learn how to check fuel injectors to make sure they are working. You use a multimeter on the resistance settings and measure the ohms of. Using a voltmeter to perform an injector voltage supply test requires an assistant and is an important safety step to prevent major engine damage.

Remove the fuel pump fuse. This will prevent the car from starting while a crank test is being performed. The next step if the injector resistance is normal would be to remove the injector and test the spray pattern it produces on an injector tester. If you are experiencing any difficulty with testing your injectors , our certified technicians here at YourMechanic would be able to assist you with diagnosing the problem and replacing any bad fuel injectors. Here’s how you can test the fuel injector in your car yourself instead of taking it to the mechanic.

The first step is to check the fuel injector with a multimeter.

Then, you will need to disconnect the fuel injector and place the leads of the multimeter on the terminals of the fuel injector and make a note of its reading. Repeat this test on each injector and take note of dead injectors , so that you can test them in the following section. WARNING on Multimeter Use When troubleshooting electronic components on your car with a digital multimeter , always use a Megohm (minimum) impedance multimeter to prevent circuit damage. A shorted injector can hinder the injector driver operation for additional injectors , unplug all injectors and re- test pulse trigger, if pulse returns, plug the injectors back in one at a time until the pulse fails, replace the shorted injector. If tests check okay, proceed to next step.

No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7. RaceChip: Next generaton Chip Tuning for your Car incl. Plan to pull them all and have a local injector shop test them and replace any that are worn. Touch it to the injector while the car is running and listen.

Use the same wire plug to test the other fuel injectors and repeat the test for each. It is not necessary to test other plugs while checking for a short. If a short is present, the test will fail when the plug wire is connected to a faulty injector. For the final test , disconnect a previously connected plug and verify the voltage to test the last fuel injector. All injectors should be within.

If an injector is out of the resistance specification, that injector is bad. Place the multimeter leads into the fuel injector plug terminal. Read the Ohms, or resistance, produced by the fuel injector.

Note the value or write it down. Injectors are electrically operated valves which accurately control the quantity of fuel delivered. They have a coil (except piezo) with a resistance.

Inadequate performance not due to part failure should be addressed with fuel injection cleaning.