How to test fuel injectors for pulsing. Learn how to check fuel injectors. I use a screwdriver to test fuel injectors to make sure they are firing. You place a long screwdriver to the base of each injector and put your ear to the end of the screwdriver (like a doctors stethoscope). You should hear constant clicking. If not, then your injector isn't firing or is firing intermittently.
Symptoms of bad injectors are a check engine light with codes P0300 through P0308, misfiring, hesitation, poor fuel economy, stalling, and a poor idle.

Using a Multimeter to Check Fuel Injector Resistance:    • How to Check Fuel Injector Resistance...  

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