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【Complete Test Kit for Fuel Injection Systems】 This Noid Light and IAC Test Kit contains eight noid lights, two 4-pin connectors, and a robust plastic carry case for secure storage and easy portability. 【Quick Diagnosis of the EFI System】 With the Noid Light test, the electrical injection system can be checked when the vehicle does not start. Simply disconnect the electrical connector from the injector, insert the appropriate noid light, and start the engine. Flashing light: The system is functioning correctly Constant light: Malfunction in the electrical system 【Precise Testing of the Idle Air Control (IAC) System】 The IAC test helps identify the idle air control valve as the source of the fault. To do this, disconnect the electrical plug from the IAC valve, connect the test device, and test the engine at idle with load: Two flashing lights: System is working correctly No flashing: Possible defect in the IAC system 【Universal Compatibility with European and International Vehicles】 The noid lights are compatible with American, European, and Japanese vehicles with fuel injection systems. Includes eight different noids with various connector configurations, including: 3 for GM vehicles 1 for Ford 2 for Bosch systems 1 for GEO 1 for MULTITEC-2 【Easy Application for Professional and DIY Users】 Disconnect the fuel injector connector Insert the noid light Start the engine and observe the light signal Flashing light: The control unit is transmitting the injection pulse correctly No flashing: Possible issues with the control unit or a clogged fuel injector