Hyundai Tucson: Troubleshooting

Symptom- Engine misfire with abnormal internal lower engine noises.

Suspect area/ Remedy

• Loose or improperly installed drive plate(or fly wheel)./  Repair or replace the drive plate(or fly wheel) 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.

Symptom- Engine misfire with abnormal valve train noise.

Suspect area/ Remedy

• 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.

Symptom- Engine misfire with coolant consumption.

Suspect area/ Remedy

• Engine misfire with coolant consumption./ Inspect the cylinder head and engine block for damage to the coolant passages and/or a faulty head gasket.
• Coolant consumption may or may not cause the engine to overheat./ Repair or replace as required.

Symptom- Engine misfire with excessive oil consumption.

Suspect area/ Remedy

• 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.

Symptom- Engine noise on start-up, but only lasting a few seconds.

Suspect area/ Remedy

• 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.

Symptom- Upper engine noise, regardless of engine speed.

Suspect area/ Remedy

• 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.

Symptom- Lower engine noise, regardless of engine speed.

Suspect area/ Remedy

• 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 connecting rods.
• The crankshaft.
• 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

Symptom- Engine noise under load.

Suspect area/ Remedy

• 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.
• The connecting rods.
• The crankshaft.

• Excessive crankshaft bearing clearance./ Inspect the following components and repair as required.

• The crankshaft bearings.
• The crankshaft journals.
• The cylinder block crankshaft bearing bore.

Symptom- Engine will not crank. (crankshaft will not rotate)

Suspect area/ Remedy

• Hydraulically locked cylinder.

• Coolant/antifreeze in cylinder.
• Oil in cylinder.
• Fuel 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.

• Broken valve.
• Piston material.
• Foreign material./ 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.

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