Hyundai Elantra CN7 Quiz

Troubleshooting

In this manual: Troubleshooting
Repair and Maintenance Manual for Hyundai Elantra — 0General Information — 0Engine - Mechanical (DOHC 1.8L/2.0L) — 0Engine - Mechanical (DOHC 1.6L) — 0Engine Electrical Equipment — 0Emission Control System — 0Fuel system — 0Clutch — 0Transmission — 0Wheel Drive Shaft and Axle — 0Suspension — 0Steering — 0
~2min read

Symptom Possible Cause Remedy
Low compression Cylinder head gasket leak; Worn or damaged piston rings; Worn piston or cylinder; Worn or damaged valve seats Replace gasket; Replace rings; Repair or replace pistons and/or cylinder block; Repair or replace valves and/or valve seats
Low oil pressure Low oil level in oil pan; Faulty oil pressure switch; Clogged oil filter; Worn oil pump gears or cover; Low engine oil viscosity (dilution or thinning); Pressure relief valve stuck open; Excessive bearing clearance Check oil level; Replace; Replace; Replace; Replace; Replace oil and find cause of malfunction; Repair; Replace
High engine oil pressure Pressure regulator valve stuck (in closed position) Repair
Excessive engine vibration Engine front and rear mount brackets loose Transmission mount bracket loose Engine side mount bracket loose Center member loose Transmission mount faulty Engine side mount faulty Engine front or rear mount faulty Tighten; Tighten; Tighten; Tighten; Replace; Replace; Replace
Valve noise Reduced engine oil viscosity (dilution or thinning) (or low oil pressure) Wear or damage of valve stem or valve guide Improper operation of hydraulic lash adjusters Replace Replace Increase engine crankshaft speed to bleed hydraulic lash adjusters or replace hydraulic lash adjusters.
Connecting rod or crankshaft main bearing noise Insufficient oil flow to bearings; Low engine oil viscosity (dilution or thinning); Excessive bearing clearance Check engine oil level; Replace oil and find cause of malfunction; Replace
Timing belt noise Incorrect belt tension Adjust belt tension
Low coolant level Coolant leaks: 1. Radiator or heater hoses 2. Faulty radiator cap 3. Thermostat housing 4. Radiator 5. Water pump Repair or replace parts; Install correctly or replace; Replace gasket or housing; Replace or repair; Replace parts
Radiator clogged Foreign matter in coolant Replace coolant
Abnormally high coolant temperature Faulty thermostat Faulty radiator cap Restricted coolant flow in cooling system Loose or broken generator drive belt Faulty coolant pump Faulty radiator electric fan Low coolant level Replace parts Replace parts Clean cooling system or replace parts Adjust tension or replace Replace Repair or replace Top up coolant
Abnormally low coolant temperature Thermostat malfunction. Engine coolant temperature sensor or its wiring malfunction Replace. Repair or replace
Radiator cooling fan does not operate Malfunction of: engine coolant temperature sensor, radiator cooling fan motor, radiator cooling fan motor relay, wiring or fuse Repair or replace
Exhaust system leakage Loose connection joints. Defective exhaust pipe or muffler Tighten. Replace or repair
Abnormal noise from exhaust system Burnt-through baffles in muffler. Defective rubber-metal hanger bracket. Exhaust pipe or muffler contacts body. Defective exhaust pipe or muffler Replace. Replace. Correct. Repair or replace

Test yourself

A quick Hyundai Elantra CN7 quiz: every answer comes with an explanation and a link to the manual page.