Electronic Fuel Injector Test Light Kit

8pc Noid Light Test Kit
compatible with GM PFI;
compatible with GM TBI;
compatible with GM SCPI;
compatible with GM Multec2;
compatible with FORD TBI;
compatible with Geo TBI;
compatible with BOSH PFI;
compatible with Bosch2.

You can use a test light to check the power and pulse signal for each bad injector：

First, hook the test light clip to a bolt or exposed metal bracket on the engine. Unplug the electrical connector from the fuel injector you want to test. Turn the ignition switch to the ON position.

Second, touch the test light to the terminals of the harness connector (one at a time). One of the terminals should make the test light glow: this is the injector power from the computer. If the test light does not light up, you have found the problem. Check the power side of the circuit for a short, a blown fuse, or a bad connection in the circuit (including the computer).

Finally, plug the harness connector back onto the fuel injector and hook the test light clip to the positive terminal of the battery. Have an assistant crank or start the engine. Reverse probe the opposite wire on the fuel injector connector (this is the pulse signal from the computer). If you cannot reverse probe the wire, insert a pin into the wire and use the pin to probe the wire. This time, the test light should flash, which means the injector is receiving the pulse signal from the computer to turn the injector on and off.

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