What are these? I've heard that they are for testing the injectors. If so, how do they work and are they worth buying? Thx.

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92 RS 25 ann. ed. bone stock.
5.0/TBI/T-5
T-TOPS
Many mods to come.

 

They don't test injectors, they test injector circuits. Injectors need to be flow tested and the injector coils should be checked for coil draw.

The noid light is just a light that plugs into the injector plug and will flash when the injector should be firing. This lets you know the ECM has control over the injectors and that the wiring is OK.

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'87 Trans Am
S/D TPI retrofit including functional PassKey,
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JET AFPR, Ported Plenum,
TB Coolant Bypass, Custom Cold Air,
SSM SFC, KYB Shocks, Boxed LCAs, Wonder Bar,
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'97 Bonneville SSE