Hyundai i20 Quiz
Engine Mechanical System

Troubleshooting

In this manual: Engine Mechanical System
General Information — 17Engine Mechanical System — 79Engine Electrical System — 50Emission Control System — 22Engine/Fuel Control System — 107Clutch System — 27MANUAL TRANSMISSION SYSTEM — 21Drive Shaft and Axle — 18Suspension System — 29Steering System — 21Restraint — 41Braking System — 53Body Work (Interior and Exterior) — 190Body Electrical System — 181Heating, Ventilation and Air Conditioning — 58
~4min read

TROUBLESHOOTING

Symptom Suspected Area REMEDY
Engine misfire accompanied by abnormal noise from the lower part of the engine Damaged crankshaft bearings
Loose or damaged drive plate		 Replace the crankshaft and bearings if necessary.
Repair or replace the drive plate if necessary.
Worn piston rings
(oil consumption may or may not cause engine misfire)		 Check for loss of compression in the cylinders. Repair or replace as necessary.
Damaged crankshaft thrust bearings Replace the crankshaft and bearings if necessary.
Engine misfire accompanied by abnormal noise from the throttle control valve Clogged valves
(carbon buildup on valve stem)		 Repair or replace defective parts as necessary.
Excessive wear or misalignment of the timing chain drive Replace the timing chain tensioner and sprocket as necessary.
Worn camshaft lobes Replace the camshaft and valve lifters.
HLA sponge Run the engine at 2,500–3,000 rpm for 15 minutes.
If the noise does not go away, refer to Cylinder Head Assembly in this group.
Engine misfire with coolant consumption
  • Defective cylinder head gasket and/or starter or other damage at the cylinder head and cooling system level; Engine block
  • Abnormal coolant consumption may cause overheating.
  • Inspect the cylinder head and cylinder block for damage, especially in the coolant passages, and/or if the head gasket is faulty.
  • Repair or replace defective parts as necessary.
Engine misfire accompanied by excessive oil consumption Worn valves, valve guides, and/or valve stem seals Repair or replace defective parts as necessary.
Worn piston rings
(Excessive oil consumption may cause misfire).
  • Check the cylinder compression for loss.
  • Repair or replace defective parts as necessary.
Engine noise at start-up, but only for a few seconds Incorrect engine oil viscosity
  • Drain the oil.
  • Add oil of the correct viscosity.
Damaged crankshaft thrust bearing
  • Check the thrust bearings and the crankshaft.
  • Repair or replace defective parts as necessary.
Noise in the upper part of the engine that is not related to engine speed Low oil pressure. Repair or replace defective parts as necessary.
Valve rotator reverse Replace the valve spring.
Dirty or worn valve lifters Replace the valve lifters.
Worn or broken timing chain and/or damaged sprocket teeth Replace the timing chain tensioner and sprockets.
Timing chain tensioner damaged, if equipped Replace the timing chain tensioner if necessary.
Worn camshaft lobes
  • Check the camshaft lobes.
  • Replace the camshaft and valve lifters if necessary.
Valve guides or valve stems worn Check the valves and valve guides and repair if necessary.
Sticking valves. Carbon deposits on the valve stem or valve face may cause the valve to remain open. Check the valves and valve guides and repair if necessary.
Drive belt, idler gear, tensioner and bearing worn Replace if necessary.
Noise in the lower part of the engine that is not related to engine speed. Low oil pressure. Repair faulty components if necessary.
Loose or damaged drive plate Repair or replace the drive plate.
Oil pan damaged, contacting the oil pump strainer
  • Check the oil drain.
  • Check the oil pump filter.
  • Repair or replace defective parts as necessary.
Oil pump filter loose, damaged or clogged
  • Check the oil pump filter.
  • Repair or replace defective parts as necessary.
Excessive piston-to-cylinder clearance
  • Inspect the piston, piston pin, and cylinder bore.
  • Repair faulty components if necessary.
Excessive piston pin-to-piston clearance
  • Inspect the piston, piston pin, and connecting rod.
  • Repair or replace defective parts as necessary.
Excessive connecting rod bearing clearance Check the following components and repair if necessary.
  • Connecting rod bearings.
  • Connecting rods.
  • Crankshaft main bearings.
Excessive crankshaft bearing clearance Check the following components and repair if necessary.
  • Crankshaft bearings.
  • Crankshaft main journals.
  • Cylinder block.
Incorrect installation of piston, piston pin, and connecting rod
  • Make sure the piston pins and connecting rods are installed correctly.
  • Repair faulty components if necessary.
Engine noise under load Low oil pressure. Repair or replace defective parts as necessary.
Excessive connecting rod bearing clearance Inspect the following components and repair if necessary:
  • Connecting rod bearings.
  • Connecting rods.
  • Crankshaft.
Excessive crankshaft bearing clearance Check the following components and repair if necessary.
  • Crankshaft bearings.
  • Crankshaft main journals.
  • Cylinder block.
Engine does not start. (Crankshaft does not rotate.) Hydraulic lock of cylinder
  • Coolant/antifreeze present in the cylinder
  • Oil in cylinder
  • Fuel present in the cylinder
  • Remove the spark plugs and check for leaks.
  • Make sure the cylinder head gasket is not damaged.
  • Make sure the cylinder block or cylinder head is not cracked.
  • Make sure the fuel injector is not sticking and/or the fuel pressure regulator is not leaking.
Broken timing chain and/or timing chain sprocket
  • Check the timing chain and sprockets.
  • Repair faulty components if necessary.
Material in cylinder
  • Broken valve
  • Piston material
  • Foreign material
  • Check the cylinder for faulty components and/or foreign objects.
  • Repair or replace defective parts as necessary.
Seized crankshaft or connecting rod bearing(s)
  • Check the crankshaft and connecting rod bearing.
  • Repair faulty components if necessary.
Bent or broken connecting rod
  • Inspect the connecting rods.
  • Repair faulty components if necessary.
Broken crankshaft
  • Inspect the crankshaft.
  • Repair faulty components if necessary.

Test yourself

A quick Hyundai i20 quiz: every answer comes with an explanation and a link to the manual page.