It's important to make sure that each cylinder is getting spark with a dedicated spark tester.If no codes are registered, the next step is doing a cylinder balance test to find the ‘dead’ cylinder.This means connecting a scan tool (or a code reader) and checking for misfire trouble codes.OK, below are the diagnostic steps I take when trying to diagnose a bad fuel injector: So, as you can already probably deduce, this means that for the most part you should leave testing the fuel injector's internal resistance as a last step. Then, there's making sure that the engine cylinders' compression is not the cause of the problem. Once you've identified the ‘dead’ cylinder (misfiring cylinder), the next important step is eliminating the ignition coils as bad. The most important first step is to find out which of the 4 cylinders is misfiring. There is a logical way to finding out if a bad fuel injector is behind the misfire (rough idle) behind your 2.5L Altima (or 2.5L Sentra). ![]() How To Find The Bad Or Clogged Fuel Injector
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