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Hyundai Tucson: Troubleshooting

Hyundai Tucson - Fourth generation (NX4) - (2020-2023) - Workshop Manual / General Information / 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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