Hyundai Tucson LM Quiz
Engine Mechanical System

Troubleshooting

In this manual: Engine Mechanical System
General Information — 1Engine Mechanical System — 44Engine Electrical System — 45Emission Control System — 24Engine Control System/Fuel System — 93Clutch System — 13Manual Transmission — 18Automatic Transmission — 87Four-Wheel Drive (4WD) System — 26Drive Shaft and Axle — 29Suspension System — 35Steering — 20Restraints — 47Brake System — 36Body (Interior and Exterior) — 53Body Electrical System — 202Heating, Ventilation, and Air Conditioning — 58
14steps
~84min
3/5difficulty
Done 0 of 14

Troubleshooting

Symptom Suspected Area Remedy
Engine misfire with abnormal internal low engine noise
  • Worn crankshaft bearings
  • Loose or out-of-specification engine flywheel
  • Replace the crankshaft and bearings if necessary.
  • Repair or replace the flywheel if necessary.
Worn piston rings
(Oil consumption may or may not cause engine misfire.)		 Inspect the cylinder for loss of compression.
Repair or replace if necessary.
Worn crankshaft thrust bearings Replace the crankshaft and bearings as necessary.
Engine misfire with abnormal valve train noise Stuck valves
(Carbon on valve stem)		 Repair or replace if necessary.
Excessively worn or misaligned timing chain Replace the timing chain and sprocket if necessary.
Worn camshaft lobes Replace the camshaft.
Engine misfire with coolant consumption
  • Head gasket failure or other damage to the cylinder head and cylinder block cooling system.
  • Coolant consumption may or may not cause engine overheating.
  • Inspect the cylinder head and cylinder block for damage to the coolant passages and/or a defective head gasket.
  • Repair or replace if necessary.
Engine misfire with excessive oil consumption Worn valves, valve guides, and/or valve stem seals Repair or replace if necessary.
Worn piston rings
(Oil consumption may or may not cause engine misfire)
  • Inspect the cylinder for loss of compression.
  • Repair or replace if necessary.
Engine noise at start-up that lasts only a few seconds
(Check and compare with a known good vehicle to determine normal condition.)		 Incorrect engine oil viscosity
  • Drain the oil.
  • Fill with engine oil of the correct viscosity.
Worn crankshaft thrust bearing
  • Inspect the thrust bearing and crankshaft.
  • Repair or replace if necessary.
Engine noise is louder regardless of engine speed Low oil pressure Repair or replace if necessary.
Broken valve spring Replace the valve spring.
Worn or dirty valve lifters Replace the valve lifters.
Stretched or broken timing chain and/or damaged sprocket teeth Replace the timing chain and sprockets.
Worn timing chain tensioner, if applicable Replace the timing chain tensioner if necessary.
Worn camshaft lobes
  • Inspect the camshaft lobes.
  • Replace the camshaft if necessary.
Worn valve guides or valve stems Inspect the valves and valve guides, then repair or replace as necessary.
Sticking valves (Carbon on the valve stem or valve seat may cause the valve to remain open.) Inspect the valves and valve guides, then repair or replace as necessary.
Worn drive belt, tensioner, idler, and bearing Replace as necessary.
Low engine noise regardless of crankshaft speed. Low oil pressure Repair or replace as required.
Loose or damaged flywheel Repair or replace the flywheel.
Damaged oil pan, contact with oil pump strainer
  • Inspect the oil pan.
  • Inspect the oil pump strainer.
  • Repair or replace if necessary.
Oil pump strainer loose, damaged, or clogged
  • Inspect the oil pump strainer.
  • Repair or replace if necessary.
Excessive piston-to-cylinder clearance
  • Inspect the piston, piston pin, and cylinder bore.
  • Repair or replace if necessary.
Excessive piston pin-to-piston clearance
  • Inspect the piston, piston pin, and connecting rod.
  • Repair or replace if necessary.
Excessive connecting rod bearing clearance Inspect the following components and repair or replace if necessary.
  • Connecting rod bearings.
  • Connecting rods.
  • Crankshaft thrust washers.
Excessive crankshaft bearing clearance Inspect the following components and repair or replace 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 as necessary.
Engine noise under load Low oil pressure Repair or replace if necessary.
Excessive connecting rod bearing clearance Inspect the following components and repair or replace if necessary:
  • Connecting rod bearings
  • Connecting Rods
  • Crankshaft
Excessive crankshaft bearing clearance Inspect the following components and repair or replace if necessary:
  • Crankshaft Bearings
  • Crankshaft Main Journals
  • Cylinder block
Engine does not start.
Crankshaft does not rotate.		 Hydraulic lock of cylinder
  • Coolant/antifreeze in cylinder
  • Oil in cylinder
  • Fuel in cylinder
  1. Remove the spark plugs and check for liquid.
  2. Inspect for a broken head gasket.
  3. Inspect the cylinder block or cylinder head for cracks.
  4. Inspect the fuel injector and/or fuel pressure regulator for sticking.
Broken timing chain and/or timing chain sprocket
  1. Inspect the timing chain and sprockets.
  2. Repair as necessary.
Material in cylinder
  • Broken valve
  • Piston material
  • Foreign material
  1. Inspect the cylinder for damaged components and/or foreign material.
  2. Repair or replace if necessary.
Seizure of crankshaft or connecting rod bearings
  1. Inspect the crankshaft and connecting rod bearings.
  2. Repair as necessary.
Bent or broken connecting rod
  1. Inspect the connecting rods.
  2. Repair as necessary.
Broken crankshaft
  1. Inspect the crankshaft.
  2. Repair as necessary.

Test yourself

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