1.2L REVOTRON Bi FUEL CNG ENGINE 14 Worn I damaged piston ring(s) or cylinder bore, permitting oil blow-by Perform engine compression test and/or leak-down test. Head gasket leaking oil into combustion chamber Inspect engine coolant for oil and perform engine compression test. Engine emits black smoke from tail pipe. Excess carbon deposits in combustion chamber Remove carbon deposits in combustion chamber using a commercially available cleaner Excess fuel entering cylinder(s) Check lambda/O2 and other engine sensors for proper operation. Test fuel injectors for proper operation or leakage. Check the fuel and emissions system for proper operation. Exhaust rubber hanger wear / crack. Ageing of rubber hanger Check the Exhaust rubber hangers & replaced if found crack / damage or wear. 6. Cooling System Condition Possible Cause Remedy Overheating Low coolant level/ Cooling system leaking Check coolant level in reservoir and inspect system for leaks. Add coolant as necessary. Defective thermostat Remove thermostat and check for proper opening at specified temperature. Defective water pump Inspect and replace water pump as necessary. Defective temperature sending unit Check coolant temperature sending unit Replace as necessary. Engine cooling fan malfunctioning Test operation of engine cooling fan. Repair or replace as necessary. Engine overloading Make sure vehicle brakes are not dragging. Vehicle overloaded. Make sure vehicle does not exceed weight limit with cargo. Engine lean condition Verify proper operation of fuel system components. Repair system or replace components as necessary. Head gasket leaking Test engine compression. Replace head gasket as necessary. Over cooling Defective thermostat Remove thermostat and check for proper opening at specified temperature.
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