Symptom
|
Suspect area
|
Remedy
|
Engine misfire with abnormal internal lower engine noises.
| Loose or improperly installed drive plate.
| Repair or replace the drive plate 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 buildup on the valve stem can cause the valve not to close properly.)
| Repair or replace as required.
|
Excessive worn or mis-aligned timing chain.
| Replace the timing chain and sprocket as required.
|
Worn camshaft lobes.
| Replace the camshaft and HLA.
|
Engine misfire with coolant consumption.
| | •
| Faulty cylinder head gasket and/or cracking 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, valve 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)
| Inspection the cylinder for a loss of compression.
Repair or replace as required.
|
Engine noise on start-up, but only lasting a few seconds.
| 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.
|
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 as required.
|
Worn camshaft lobes.
| Inspect the camshaft lobes.
Replace the camshaft and valve lifters as required.
|
Worn valve guides or valve stems.
| Inspect the valves and valve guides, then repair 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 as required.
|
Lower engine noise, regardless of engine speed.
| Low oil pressure.
| Repair or replace damaged components as required.
|
Loose or damaged drive plate.
| Repair or replace the drive plate.
|
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 and cylinder bore.
Repair as required.
|
Excessive piston pin-to-bore 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 as required.
| •
| The connecting rod bearings. |
| •
| The crankshaft journal. |
|
Excessive crankshaft bearing clearance.
| Inspect the following components and repair as required.
| •
| The crankshaft bearings. |
| •
| The crankshaft journals. |
|
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 as required.
| •
| The connecting rod bearings. |
|
Excessive crankshaft bearing clearance.
| Inspect the following components and repair as required.
| •
| The crankshaft bearings. |
| •
| The crankshaft journals. |
| •
| The cylinder block crankshaft bearing bore. |
|
Engine will not crank. (crankshaft will not rotate)
| Hydraulically locked cylinder.
| •
| Coolant/antifreeze in cylinder. |
| Remove spark plugs and check for fluid.
Inspect for broken head gasket.
Inspect for cracked engine block or cylinder head.
Inspect for a sticking fuel injector and/or leaking fuel regulator.
|
Broken timing chain and/or timing chain gears.
| Inspect timing chain and gears.
Repair as required.
|
Foreign material in cylinder.
| Inspect cylinder for damaged components and/or foreign materials.
Repair or replace as required.
|
Seized crankshaft or connecting rod bearings.
| Inspect crankshaft and connecting rod bearing.
Repair or replace as required.
|
Bent or broken connecting rod.
| Inspect connecting rods.
Repair or replace as required.
|
Broken crankshaft.
| Inspect crankshaft.
Repair or replace as required.
|
Hyundai Elantra CN7: Troubleshooting
