Hyundai Tucson Automotive Service Manual: Troubleshooting

TROUBLESHOOTING

Symptom	Suspected Area	REMEDY
Engine misfire accompanied by abnormal noise from the lower part of the engine	Damaged crankshaft bearings Loose or out-of-specification flywheel	Replace the crankshaft and bearings if necessary. Repair or replace the flywheel if necessary.
	Worn piston rings (Oil consumption may cause misfire).	Inspect the cylinder for loss of compression. If necessary, repair or replace faulty parts.
	Damaged crankshaft thrust bearings	Replace the crankshaft and bearings if necessary.
Engine misfire accompanied by abnormal noise from the throttle control valve	Clogged valves (carbon buildup on valve stem)	Repair or replace defective parts as necessary.
	Excessive wear or misalignment of the timing chain drive	Replace the timing chain tensioner and sprocket as necessary.
	Worn camshaft lobes	Replace the camshaft.
Engine misfire with coolant consumption	Cylinder head gasket or other cylinder head damage, and engine block cooling system Abnormal coolant consumption may cause overheating	Inspect the cylinder head and cylinder block for damage, especially in the coolant passages, and/or if the head gasket is faulty. Repair or replace defective parts as necessary.
Engine misfire accompanied by excessive oil consumption	Worn valves, valve guides, and/or valve stem seals	Repair or replace defective parts as necessary.
Engine misfire accompanied by excessive oil consumption	Worn piston rings (Excessive oil consumption may cause misfire).	Inspect the cylinder for compression leaks. Repair or replace defective parts as necessary.
Engine noise at startup, but only for a few seconds (Check and compare with a verified vehicle to determine normal condition.)	Incorrect engine oil viscosity	Drain the oil. Add oil of the correct viscosity.
	Damaged crankshaft thrust bearing	Check the thrust bearings and the crankshaft. Repair or replace defective parts as necessary.
Noise in the upper part of the engine that is not related to engine speed	Low oil pressure.	Repair or replace defective parts as necessary.
	Valve rotator reverse	Replace the valve spring.
	Worn or dirty valve lash adjuster (MLA)	Replace the valve lash adjuster (MLA).
	Stretched or broken timing chain and/or damaged sprocket teeth	Replace the timing chain tensioner and sprockets.
	Timing chain tensioner damaged, if equipped	Replace the timing chain tensioner if necessary.
	Worn camshaft lobes	Check the camshaft lobes. Replace the camshaft if necessary.
	Valve clearances out of specification (MLA) Valve guides or valve stems worn	Inspect the valves and valve guides, then repair or replace as necessary.
	Valves stuck (valve stem or valve seat prevents valve from closing.)	Inspect the valves and valve guides, then repair or replace as necessary.
	Drive belt, idler gear, tensioner and bearing worn	Replace if necessary.
Noise in the lower part of the engine that is not related to engine speed.	Low oil pressure.	Repair or replace.
	Loose or damaged flywheel	Repair or replace the flywheel.
	Oil pan damaged, contacting the oil pump strainer	Check the oil drain. Check the oil pump filter. Repair or replace defective parts as necessary.
	Oil pump filter loose, damaged or clogged	Check the oil pump filter. Repair or replace defective parts as necessary.
	Excessive piston-to-cylinder clearance	Inspect the piston, piston pin, and cylinder bore. Repair or replace defective parts as necessary.
	Excessive piston pin-to-piston clearance	Inspect the piston, piston pin, and connecting rod. Repair or replace defective parts as necessary.
	Excessive connecting rod bearing clearance	Inspect the following components and repair or replace as necessary. Connecting rod bearings. Connecting rods. Crankshaft main bearings.
	Excessive crankshaft bearing clearance	Inspect the following components and repair or replace as 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 faulty components if necessary.
Engine noise under load	Low oil pressure.	Repair or replace defective parts as necessary.
	Excessive connecting rod bearing clearance	Inspect the following components and repair or replace as necessary. Connecting rod bearings connecting rods Crankshaft
	Excessive crankshaft bearing clearance	Inspect the following components and repair or replace as necessary. Crankshaft Bearings Crankshaft Main Journals Cylinder block
Engine does not start. Crankshaft does not turn.	Hydraulic lock of cylinder Coolant/antifreeze present in the cylinder Oil in cylinder Fuel present in the cylinder	1 Remove the spark plugs and check for leaks. 2 Make sure the cylinder head gasket is not damaged. 3 Make sure the cylinder block or cylinder head is not cracked. 4 Make sure the fuel injector is not sticking and/or the fuel pressure regulator is not leaking.
	Broken timing chain and/or timing chain sprocket	1 Check the timing chain and sprockets. 2 Repair faulty components if necessary.
	Material in cylinder Broken valve Piston material Foreign material	1 Check the cylinder for faulty components and/or foreign objects. 2 Repair or replace defective parts as necessary.
	Seized crankshaft or connecting rod bearing(s)	1 Check the crankshaft and connecting rod bearing. 2 Repair faulty components if necessary.
	Bent or broken connecting rod	1 Inspect the connecting rods. 2 Repair faulty components if necessary.
	Broken crankshaft	1 Inspect the crankshaft. 2 Repair faulty components if necessary.

Troubleshooting

TROUBLESHOOTING

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