Symptom | Probable cause | Remedy |
Low compression | Damaged cylinder head gasket Worn or damaged piston rings Worn piston or cylinder Worn or damaged valve seat | Replace gasket Replace rings Repair or replace piston and/or cylinder block Repair or replace valve and/or seat ring |
Oil pressure drop | Low engine oil level Faulty oil pressure switch Clogged oil filter Worn oil pump rotor or cover Thin or diluted engine oil Oil relief valve stuck (open) Excessive bearing clearance | Check engine oil level Replace Replace Replace Change and find out cause Repair Replace |
High oil pressure | Oil relief valve stuck (closed) | Repair |
Excessive engine vibration | Loose engine roll stopper (front, rear) Loose transaxle mount bracket Loose engine mount bracket Loose center member Broken transaxle mount insulator Broken engine mount insulator Broken engine roll stopper insulator | Re-tighten Re-tighten Re-tighten Re-tighten Replace Replace Replace |
Noisy valves | Thin or diluted engine oil (low oil pressure) Worn or damaged valve stem or valve guide | Change Replace |
Connecting rod and/main beaing noise | Insufficient oil supply Thin or diluted engine oil Excessive bearing clearance | Check engine oil level Change and find out cause Replace |
Timing belt noise | Incorrect belt tension | Adjust belt tension |
Low coolant level | Leakage of coolant Damaged radiator core joint Corroded or cracked hoses (radiator hose, heater hose, etc) Faulty radiator cap valve or setting of spring Faulty thermostat Faulty engine coolant pump | Replace Replace Replace Replace Replace |
Clogged radiator | Foreign material in coolant | Replace |
Abnormally high coolant temperature | Faulty thermostat Faulty radiator cap Restricted of flow in cooling system Loose or missing drive belt Faulty engine coolant pump Faulty temperature sensor wiring Faulty electric fan Faulty thermo-sensor on radiator Insufficient coolant | Replace Replace Replace Adjust or replace Replace Repair or replace Repair or replace Replace Refill coolant |
Abnormally low coolant temperature | Faulty thermostat Faulty temperature sensor wiring | Replace Repair or replace |
Leakage from oil cooling system | Loose hose and pipe connection Blocked or collapsed hose and pipe | Retighten Replace |
Inoperative electrical cooling fan | Damaged, fuse | Replace or repair |
Exhaust gas leakage | Loose connections Broken pipe or muffler | Retighten Repair or replace |
Abnormal noise | Detached baffle plate in muffler Broken rubber hanger Pipe or muffler contacting vehicle body Broken pipe or muffler | Replace Replace Correct Repair or replace |
