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6A–11 ENGINE MECHANICAL Condition Correction Possible cause Engine overheating Level of Engine Coolant too low Replenish Fan clutch defective Replace Incorrect fan installed Replace Thermostat defective Replace Engine Coolant pump defective Correct or replace Radiator clogged Clean or replace Radiator filler cap defective Replace Level of oil in engine crankcase too Change or replenish Resistance in exhaust system Clean exhaust system or replace Throttle Position Sensor adjustment Replace with Throttle Valve ASM Throttle Position Sensor circuit open Correct or replace Cylinder head gasket damaged Replace Engine overcooling Thermostat defective Replace (Use a thermostat set to ° C (180 ° F)) Engine lacks compression ———— Refer to Hard Start Others Tire inflation pressure abnormal Adjust to recommended pressures Brake drag Adjust Clutch slipping Adjust or replace Level of oil in engine crankcase too Correct level of engine oil Exhaust Gas Recirculation Valve Replace Engine Noisy Abnormal engine noise often consists of various noises moving parts of the engine. It is, therefore, advisable to Condition Possible cause Correction Noise from crank journals or from Oil clearance increased due to worn Replace crank bearings and y j bearings usually make dull noise that Crankshaft out of round Replace crank bearings and Crank bearing seized Crank bearing seized. Replace crank Troubleshooting Procedure bearing by listening for abnormal noise that stops when |