FUEL SYSTEM 29 5. TROUBLE SHOOTING: PROBLEM REPORTED POSSIBLE CAUSE CORRECTION Engine missing on CNG and runs well on petrol. Inadequate CNG supply. Check filter, pipe line, if required overhaul high pressure regulator. Ignition System faulty. Check spark plug, Leads, Ignition coil Air filter chock. Clean air filter. Wiring harness Check injector wiring harness connections for proper latching, terminal loosening. Rectify CNG Injector faulty, choked Replace injector Vacuum Leakage. Check vacuum pipe for leakage. Poor pick up. (CNG Mode) Air filter chocked. Clean air filter. Solenoid chattering. Clean solenoid plunger and spring Ignition system faulty Check ignition system. Rectify. Vacuum Leakage. Check vacuum pipe for leakage CNG Injector faulty Replace injector Pressure Regulator faulty Check gas delivery, replace if needed No/Less/over filling in CNG tank Manual knob closed. Open the valve. CNG not releasing from Regulator. Manual knob closed. Open the valve. Solenoid valve not working. Check the operation. HP pipe line blocked. Clear the blockage by compressed air. Pressure regulator faulty Check / replace Pressure regulator CNG leakage Joints, Gas Line, Components. Check and tighten the joints CNG smell in the cabin Leakage at filler valve joint Check and tighten the joint. Gas vent pipe blocked. Check and clean vent. Pressure regulator freezing Inadequate coolant circulation Check the coolant hoses for damage or leakage Blockage in coolant circuit Check & rectify. CNG leakage from filter Check & rectify. Pressure regulator chattering Solenoid plunger Housing damaged Replace Housing. Fuel Selector Switch not working. No fuel mode Solenoid plunger sticky Replace with housing.
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