Possible causes of malfunction | Remedy |
Low compression | |
Cylinder head gasket burnout | Replace gasket |
Worn or damaged piston rings | Replace rings |
Piston or cylinder wear | Repair or replace pistons and/or cylinder block |
Worn or damaged valve seats | Repair or replace valves and/or valve seats |
Low engine oil pressure | |
Low level of engine oil in the sump | Check the oil level |
Malfunction of the gauge-switch on oil pressure | Replace |
Clogged oil filter | Replace |
Worn gears or oil pump cover | Replace |
Reduced viscosity (dilution or liquefaction) engine oil | Change the oil and find the cause of the problem |
Reducing valve stuck (open) | Repair |
Increased bearing clearance | Replace |
Increased engine oil pressure | |
Reducing valve stuck (closed) | Repair |
Increased engine vibration | |
Loose front and rear engine mounts | Pull up |
Loose gearbox support bracket | Pull up |
Loose engine mount bracket | Pull up |
Loose central beam | Pull up |
Gearbox support failure | Replace |
Engine Side Mount Malfunction | Replace |
Faulty front or rear engine mount | Replace |
Valve noise | |
Reduced viscosity (dilution or liquefaction) engine oil (or low oil pressure) | Replace |
Worn or damaged valve stem or valve guide | Replace |
Incorrect operation of hydraulic lifters | Increase engine speed to bleed hydraulic lifters or replace hydraulic lifters |
Noise from crankshaft connecting rod or main bearings | |
Insufficient oil flow through bearings | Check engine oil level |
Reduced viscosity (dilution or liquefaction) engine oil | Change the oil and find the cause of the problem |
Increased clearance in bearings | Replace |
Timing belt noise | |
Incorrect belt tension | Adjust belt tension Low coolant level |
Coolant leaks | |
Radiator or heater hoses | Repair or replace parts |
Radiator cap failure | Install correctly or replace |
thermostat housing | Replace gasket or housing |
Radiator | Replace or repair |
coolant pump | Replace Parts |
Clogged radiator | |
Foreign particles in the coolant | Replace coolant |
Abnormally high coolant temperature | |
Thermostat failure Radiator cap failure | Replace Parts Replace Parts |
Difficulty in the passage of coolant in the cooling system | Clean cooling system or replace parts |
Loose or broken alternator drive belt | Adjust tension or replace |
Coolant pump malfunction | Replace |
Radiator fan failure | Repair or replace |
Low coolant level | Add coolant |
Abnormally low coolant temperature | |
Thermostat failure | Replace |
Malfunction of the coolant temperature sensor or its wiring | Repair or replace |
Radiator fan won't turn on | |
Faulty: coolant temperature sensor, radiator fan motor, radiator fan motor relay, wiring or fuse | Repair or replace |
Exhaust leak | |
Loose fasteners at joints | Pull up |
Exhaust pipes or muffler defective | Replace or repair |
Extraneous noise from the exhaust system | |
Burnt-out partitions in the muffler | Replace |
Defect rubber-metal suspension bracket | Replace |
Exhaust pipe or muffler in contact with body | Fix it |
Exhaust pipes or muffler defective | Repair or replace |