Improper grade or contaminated fuel Rush fuel system with fresh, clean, • fuel of the correct type. Replace fuel filter. Engine emits blue smoke from tailpipe. Worn or damaged valve guide seals Remove rocker arm cover and • inspect valve guide seals. Replace as necessary. Engine crankcase overfilled with oil Check oil level; drain oil as • necessary. Worn / 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. Cooling System 6. 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 Replace with new thermostat. • Defective water pump Inspect and replace water pump as • necessary. Defective temperature sensor unit Check coolant temperature sensor • 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 ENGINE 1.2L BSVI PHASE-2 16
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