All ECU’s use various sensors to find out load. Having said that the method made use of varies amongst engines as the Silvertop makes use of an easy Vane type airflow meter while the Blacktop utilizes a more sophisticated vacuum (MAP) and throttle placement (TPS) for larger sized throttle openings https://chancewvskk.blogocial.com/5-simple-techniques-for-4age-blacktop-engine-for-sale-67297510