A fuel injector Noid light will help you to troubleshoot a misfire or a No Start Condition or a BAD fuel injector and is one of those MUST HAVE tools to diagnose the majority of fuel injected vehicles on the road today.
The fuel injector Noid light test is done in conjunction with several other tests to find the root cause of the misfire or No Start your vehicle is experiencing.
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.
The fuel injector Noid light kit that I recommend is the Performance Tool NOID and IAC Light Set - 10-Pc. Set, Model# W89501 Noid light set, and here some reasons why:
- This is one of the most complete Noid light kits on the market. It contains Noid lights for the different fuel injector connectors used on the majority of makes and models, since not all cars use the same fuel injector connector type.
- The plastic case keeps all of the noid lights organized and safe.
- These tools are durable.
- Price is right.
If a fuel injector Noid light kit is on your ‘must have’ tool list and/or buying list, you can buy it here: Performance Tool NOID and IAC Light Set - 10-Pc. Set, Model# W89501.
How To Use a Noid Light
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. Here are the test steps:
Locate the fuel injector that you're gonna' test and disconnect it from its electrical connector. The fuel injector may have a metal clip securing the connector to the fuel injector, which you'll need to press in order to unlock the connector to remove it (photo 3). Or the connector will have a plastic locking tab integrated into it that needs to be pressed as you gently pull back on the connector (photo 1).
Some fuel injector connectors don't have a press-able metal clip and with this type of connector, you'll need to remove this metal clip from the fuel injector connector first.
Once the fuel injector connector is removed, insert the fuel injector Noid light into it. The Noid light should fit into the connector as easily as the fuel injector it mates to. Do not force the Noid light into the fuel injector connector if you encounter resistance from it, instead, choose another Noid light from the kit that will easily slip into the fuel injector connector.
When ready and a safe distance from the engine, where you can easily observe the Noid light, have a helper crank the engine. If all is well, the Noid light will flash on and off the whole time the engine was cranking. If the engine started, the Noid light should flash on and off the whole time the engine was running.
Now, if the Noid light did flash on and off, it's always a good idea to test the fuel injector connector next to the one you just tested and compare both results. If all is good, both connectors should make the Noid light flash in the exact same way.
Interpreting the Results of the Noid Light Test
If the Noid light flashed on and off and this flashing was comparable to the fuel injector connector next to it, then this result indicates the the fuel injector is getting power (usually in the form of 10 to 12 Volts) and that the fuel injection computer is providing a fuel injector pulse signal to activate it. Also, this test result eliminates the electrical end of the fuel injector circuit as the cause of the problem or misfire.
If the Noid light DID NOT flash on and off, this result indicates the the fuel injector is either NOT getting power (usually in the form of 10 to 12 Volts) or that the fuel injection computer is NOT providing a fuel injector pulse signal to activate it. With this result, you have confirmed that the electrical part of the fuel injector circuit is at fault.
Well, the above, in a nutshell, is how a fuel injector Noid light is used. You can buy the Performance Tool NOID and IAC Light Set - 10-Pc. Set, Model# W89501 by clicking on this link: Performance Tool (W89501) 10-Piece Noid and IAC Light Set