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How to test your fuel Injector? A complete guide - Blog Scrolls The modern fuel injectors system has a cylinder head for better control over the air-fuel mixture under any condition. With time, the build-up from the fuel impurities or external debris may cause issues in this system. A fuel injector tester is used to test the issues because these mechanical or electrical injector system problems may contribute to rough idling, misfires, the poor performance of the engine, fuel economy and even harmful emissions. To stay safe from major issues and spend more money on repairing or replacement, it is important to check the fuel injector once in a while.