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with consult you can do active tests which are temporary such as adding offset to ignition timing or fuel injection %. but u cant permanently save anything to the ECU
you can enter base idle mode which stops the ecu adjusting the idle and ignition timing so it allows you to both set correct timing (using timing light and adjustig the distributor etc), and then idle speed with idle screw etc.
it works on most cars with the consult plug (most new models after 89) and stopped around 96 in USA with obd2, and last models around 2000 (eg s15, r34) elsewhere
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