Vialle LPi (Liquid Propane Injection) system technical manual describes a high-tech approach to LPG autogas, where fuel is injected into the engine in liquid form rather than as a vapor. This "master-slave" architecture allows the system to utilize the vehicle's original engine management electronics for more accurate fuel control. Core Technical Components
The car will not switch to LPG, or switches back immediately. Technical Diagnosis: lpi vialle technical manual top