CNG SYSTEM TROUBLE SHOOTING SR. NO. PROBLEM CAUSE SOLUTION 1 Engine missing on CNG and runs well on petrol. Inadequate CNG supply. Check if filter is blocked or high pressure line is blocked. Ignition System faulty. Check spark plug and ignition coil Air filter dirty. Clean air filter Wiring harness Check injector wiring harness connections for proper latching, terminal loosening. Rectify Regulator Vacuum port blocked. Clear regulator vacuum port. 2 Poor pick up. (CNG Mode) Air filter dirty. Clean air filter Ignition system faulty Check and Rectify CNG Injector faulty Replace injector Pressure Regulator Faulty Check gas delivery, replace regulator if needed 3 Under-filling/no filling of gas into cylinder Receptacle filter mesh damaged or clogged Replace the filter mesh Receptacle o ring defective/missing Replace the o ring/fit new o ring Receptacle non return valve faulty Replace the receptacle Incorrect CNG filling gun To visit another CNG pump Incorrect CNG filling pressure To visit another CNG pump 4 CNG regulator not delivering gas Manual valve closed Open manual valve Solenoid not operating. Check operation. Replace regulator if found faulty HP line blocked Check for blockage. Clean using compressed air if blockage is found. Pressure Regulator Faulty Check and Replace 5 CNG Leakage Leakage from joints/components due to inadequate or no sealing Check and tighten the joints 6 CNG smell in passenger cabin Leakage from filler valve/ receptacle or cylinder valve joints Check and tighten the joint. Venting system blocked Check and clear blockage 1.2L REVOTRON CNG PHASE-2 ENGINE 14
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