Popular Mechanics (USA)

How It Works

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Hook up the device to a part of the car’s emissions-control system by disconnect­ing a tube from a connection port and connecting the DIY device. Cover the opening of the disconnect­ed tube with tape for a closed system. Then connect positive and negative wires to the battery. This provides heat, which generates smoke. Adjust the air regulator so the max amount of smoke travels through the system. If smoke is leaking from an obscure place like the vacuum line, evap canister, or fuel cap, there’s a crack. Hooking the line into an intake vacuum line will show if you have any leaks in the intake system. These trigger the “check engine” light, resulting in OBD trouble codes.

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