Hyundai Tucson (NX4) 2022-2025 Service Manual / Engine Mechanical System / Troubleshooting
Hyundai Tucson: Engine Mechanical System / Troubleshooting
| Symptom | Probable Cause | Remedy |
| Engine misfire with abnormal internal lower engine noises. | Worn bearings due to shortage orexcessive oil | Replace the crankshaft and bearings as required. |
| Improperly installed flywheel | Repair or replace the flywheel as required. | |
| Worn piston rings. (Oil consumption may or may not cause the engine to misfire.) | Inspect compression pressure. Repair or replace as required. | |
| Worn crankshaft thrust bearings. | Replace the crankshaft and bearings as required. | |
| Engine misfire with abnormal valve system 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 valve lifters. | |
| Faulty valve clearance. | Inspect valve clearance and adjust as necessary. | |
| Engine misfire with coolant consumption | • Faulty cylinder head gasket and/or cracking or other damage to the cylinder head and block cooling system. • Coolant consumption may or may not cause the engine to overheat. | • Inspect the cylinder head and block for damage to the coolant passages and/or a faulty head gasket. • Repair or replace as required. |
| Engine misfire with excessive engine 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) | Inspect compression pressure. Repair or replace as required. | |
| Engine noise on start-up, but only lasting a few seconds. | Incorrect oil viscosity. | Refill with the correct viscosity oil. |
| Worn crankshaft thrust bearings. | Inspect the crankshaft thrust bearings. 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 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. | 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 or replace as required. | |
| Worn drive belt, idler, tensioner and bearings. | Replace the belt and related parts as required. | |
| Lower engine noise, regardless of engine speed | Low oil pressure | Repair or replace damaged parts as required |
Loosened 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. | |
| Loosened, damaged or clogged oil pump screen. | • Inspect the oil pump screen. • Repair or replace as required. | |
| Excessive piston-to-cylinder bore clearance. | • Inspect the piston and cylinder bore. • 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. | |
| 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 | Fluid entering the cylinder • Coolant/antifreeze in cylinder. • Oil in cylinder. • Excessive fuel in cylinder. | 1) Remove the 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 from fuel pressure regulator. |
| Broken timing chain and/or timing chain sprockets. | 1) Inspect timing chain and sprockets. 2) Repair or replace as required. | |
| Foreign 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 or replace as required. | |
| Bent or broken connecting rod. | Inspect connecting rods and repair or replace as required. | |
| Broken crankshaft | 1) Inspect crankshaft. 2) Repair or replace as required. |
Repair procedures
- Compression Pressure Inspection
• If the there is lack of power, excessive oil consumption or poor fuel economy, measure the compression pressure.
1.Start the engine until ...
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