| SONATA(YF) >2013 > G 2.4 GDI > Engine Mechanical System > General Information>Troubleshooting |

Troubleshooting

Symption | Suspect area | Remedy
Engine misfire with abnormal internal lower engine noises. | Worn crankshaft bearings Loose or out of specification engine flywheel | Replace the crankshaft and bearings as required. Repair or replace the flywheel as required.
Worn piston rings (Oil consumption may or may not cause the engine to misfire.) | Inspect the cylinder for a loss of compression. Repair or replace as required.
Worn crankshaft thrust bearings | Replace the crankshaft and bearings as required
Engine misfire with abnormal valve train noise. | Stuck valves. (Carbon buidup on the valve stem) | Repair or replace as required
Excessive worn or mis-aligned timing chain Out of specification valve clearances | Replace the timing chain and sprocket as required.
Worn camshaft lobes. | Replace the camshaft and valve lifters.
Engine misfire with coolant consumption |

• | Faulty cylinder head gasket or other damage to the cylinder head and engine block cooling system.

• | Coolant consumption may or may not cause the engine to overheat.

• | Inspect the cylinder head and engine block for damage to the coolant passages and/or a faulty head gasket.

• | Repair or replace as required.

Engine misfire with excessive oil consumption | Worn valves, guides and/or valve stem oil seals. | Repair or replace as required.
Worn piston rings. (Oil consumption may or may not cause the engine to misfire) |

• | Inspect the cylinder for a loss of compression.

• | Repair or replace as required.

Engine noise on start-up, but only lasting a few seconds. (Check and compare with known good vehicle to determine normal condition.) | Incorrect oil viscosity |

• | Drain the oil.

• | Install the correct viscosity oil.

Worn crankshaft thrust bearing. |

• | Inspect the thrust bearing and crankshaft.

• | Repair or replace as required.

Upper engine noise, regardless of engine speed. | Low oil pressure | Repair or replace as required.
Broken valve spring. | Replace the valve spring.
Worn or dirty valve lifters. | Replace the valve lifters.
Stetched 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 as required.
Worn camshaft lobes. |

• | Inspect the camshaft lobes.

• | Replace the timing camshaft and valve lifters as required.

Out of specification valve clearances Worn valve guides or valve stems. | Inspect the valves and valve guides, then repair or replace as required.
Stuck valves. (Carbon on the valve stem or valve seat may cause the valve to stay open. | Inspect the valves and valve guides, then repair or replace as required.
Worn drive belt, idler, tensioner and bearing. | Replace as required
Lower engine noise, regardless of engine speed | Low oil pressure | Repair or required.
Loose or damaged flywheel. | Repair or replace the flywheel.
Damaged oil pan, contacting the oil pump screen. |

• | Inspect the oil pan.

• | Inspect the oil pump screen.

• | Repair or replace as required.

Oil pump screen loose, damaged or restricted. |

• | Inspect the oil pump screen.

• | Repair or replace as required.

Excessive piston-to-cylinder bore clearance. |

• | Inspect the piston, piston pin and cylinder bore.

• | Repair or replace as required.

Excessive piston pin-to-piston clearance |

• | Inspect the piston, piston pin and the connecting rod.

• | Repair or replace as required.

Excessive connecting rod bearing clearance | Inspect the following components and repair or replace as required.

• | The connecting rod bearings.

• | The connecting rods.

• | The crankshaft pin journals.

Excessive crankshaft bearing clearance | Inspect the following components, and repair or replace as required.

• | The crankshaft bearings.

• | The crankshaft main journals.

• | The cylinder block

Incorrect piston, piston pin and connecting rod installation |

• | Verify the piston pins and connecting rods are installed correctly.

• | Repair as required.

Engine noise under load | Low oil pressure | Repair or replace as required.
Excessive connecting rod bearing clearance | Inspect the following components and repair or replace as required :

• | The connecting rod bearings.

• | The connecting rods.

• | The crankshaft

Excessive crankshaft bearing clearance | Inspect the following components, and repair or replace as required.

• | The crankshaft bearings.

• | The crankshaft main journals.

• | The cylinder block.

Engine will not crank-crankshaft will not rotate | Hydraulically locked cylinder

• | Coolant/antifreeze in cylinder.

• | Oil in cylinder.

• | Fuel in cylinder

1. | Remove spark plugs and check for fluid.

2. | Inspect for broken head gasket.

3. | Inspect for cracked engine block or cylinder head.

4. | Inspect for a sticking fuel injector and/or leaking fuel regulator.

Broken timing chain and/or timing chain and/or timing chain gears. |

1. | Inspect timing chain and gears.

2. | Repair as required.

Material in cylinder

• | Broken valve

• | Piston material

• | Foreign material

1. | Inspect cylinder for damaged components and/or foreign materials.

2. | Repair or replace as required.

Seized crankshaft or connecting rod bearings. |

1. | Inspect crankshaft and connecting rod bearing.

2. | Repair as required.

Bent or broken connecting rod. |

1. | Inspect connecing rods.

2. | Repair as required.

Broken crankshaft |

1. | Inspect crankshaft.

2. | Repair as required.