: The Triumph Wedge Owners Association provides a comprehensive 4CU ECU guide including block diagrams, sensor inputs (airflow, coolant temp, throttle position), and common failure points.
: If left sitting for long periods, fuel can solidify and stick injectors shut. They can often be tested and cleared using a 3V pulse—do not use 12V directly for testing. Download lucas 4cu fuel injection rar
: Modern alternatives include remanufactured units from Tornado Systems that feature upgraded calibrations and improved reliability over the original factory boards. Lucas 4CU ECU - Triumph Wedge Owners Association : The Triumph Wedge Owners Association provides a