... engine ignition timing, when engines are driven by CNG, fuel(CNG) will appear beginning spot lags behind, In the ... Accent,Elantra 1.6 car For cars with ignition-injection system with C.K.P. sensor and inductive ... advance processor is used in CNG/LPG vehicles. It sends specific signals to ECU of car and as a ... M.A.P. informs to the central unit of injection, the value of the depression that forms inside ...