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6-8 ENGINE DIAGNOSIS (C24SE, C22NE, 22LE, 20LE) Condition Possible cause Correction Engine overheating Level of Engine Coolant too low Replenish Thermo switch or fan motor Replace Thermostat defective Replace Engine Coolant pump defective Correct or replace Radiator clogged Clean or replace Radiator filter cap defective Replace Level of oil in engine crankcase Change or replenish Resistance in exhaust system Clean exhaust system or replace Throttle Position Sensor Adjust Wide Open Throttle switch Throttle Position Sensor circuit Correct or replace Cylinder head gasket damaged Replace Cooling Fan clutch defective Replace Fan belt slipping Adjust tension of V-belt or replace Engine overcooling Thermostat defective Replace (Use a thermostat set to °C (197.6°F)) Engine lacks compression - Refer to Hard Start Others Tire inflation pressure abnormal Adjust to recommend pressures Brake drag Adjust Clutch slipping Adjust or replace Level of oil in engine crankcase Correct level of engine oil Engine Noisy Abnormal engine noise often consists of various noises originating in rotating parts, sliding parts and other moving parts of the engine. It is, therefore, advisable to locate the source of noise systematically. Condition Possible cause Correction Noise from crank journals or from Oil clearance increased due to Replace crank bearings and Crankshaft out of round Replace crank bearings and Crank bearing seized Replace crank bearings and |