Quote:
I could not ready frequency or voltage with my fluke when the engine was running.
All good information, but simply testing the injector connection with a ohm meter will only tell you continuity status, it does not tell you if the injector is actually getting a proper pulse signal to inject fuel.
Neither a Fluke meter or an LED test lamp can read the electrical impulses to the injectors
fast enough to show you anything while cranking the engine over to start.
That is where the NOID module that you plug into the individual injector connectors shines. It will give you visual indication that the injector is getting a proper pulse signal from the ECM to inject fuel.
Or as Sam stated, an oscilloscope if you are fortunate enough to own one....
Engine Testing Procedures and Fixes, Fuel System wrote:
A fuel injector NOID light will help you to troubleshoot a misfire, No Start or a BAD fuel injector. It is one of those MUST HAVE tools to diagnose the majority of fuel injected vehicles on the road today.
This test will tell you if the computer is pulsing the fuel injectors open when cranking the engine over. Most of the time this test is done when the engine is cranking over but not starting. However, you can do this test when the engine is running. You will be able to see if a certain fuel injector is getting a signal to fire.
All fuel injectors need power and a switching signal from the fuel injection computer. This little tool helps you to visually confirm that the fuel injector is getting both. Now, a fuel injector Noid light test won’t tell you that the fuel injector is BAD, but will confirm that it is getting power and the Switching signal (also known as the fuel injector pulse signal).
Without any of these two signals, the fuel injector will not work.As mentioned before, every make (Ford, Chevrolet, Nissan, etc.) will have a different type of fuel injector connector. So you’ll have to choose the fuel injector Noid light that will easily fit into the fuel injector connector to be tested.
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