Adjust Ignition Timing - Ahead Of The Curve
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Superchips attached a sophisticated piece of electronic diagnostic equipment to the two wires going into the coil, and determined the black one to be the one they needed to tap into. We read our shop manual when we returned to the office, and learned that the vehicle's computer opens and closes the coil's ground circuit (the black wire) for ignition coil operation. The manual stated: "By controlling the coil ground circuit, the PCM (computer) is able to set the base timing and adjust the ignition timing advance." We picked it up and adjusted it to our curve by intercepting the current between the computer and the coil. View Related Article
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