Testing With a Multimeter/Ohmreader
Step1
Set your multimeter to check for resistance or turn on the ohmmeter.
Step2
Disconnect the wires to the injector.
Step3
Place your meter's leads on each of the two injector terminals. Read the meter display.
Step4
Check your service manual for your car's resistance number. Most fuel injectors have a resistance of between 10 to 18 ohms.
Step5
Test each injector. If any of the injector readings are higher or lower than they should be, you need to replace them.
Listening
Step1
Put a long screwdriver directly on the injector while the car is running.
Step2
Hold the handle up to your ear. You should be able to hear a rhythmic clicking sound. If you do, your injector is good. Hearing a clunk-clunk type noise means you have found your problem.
Step3
Hearing silence or unusual clicking patterns means either the injector, wires or plunger may be bad or sticking. You will either have to clean or replace them.
or you could send them to
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