NVH Troubleshooting
- Locate the area where noise occurs.
- Confirm the type of noise.
- Specify the operating condition of engine.
- Check specified noise source.
If necessary, repair or replace these parts.
NVH TROUBLESHOOTING CHART
| Location of noise | Type of noise | Operating condition of engine | Source of noise | Check item | Reference page | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| Before warm-up | After warm-up | When starting | When idling | When racing | While driving | |||||
| Top of engine Rocker cover Cylinder head | Ticking or clicking | C | A | - | A | B | - | Tappet noise | Valve clearance | Service Data and Specifications |
| Rattle | C | A | - | A | B | C | Camshaft bearing noise | Camshaft journal oil clearance Camshaft runout | Camshaft: Removal and Installation | |
| Crankshaft pulley Cylinder block (Side of engine) Oil pan | Slap or knock | - | A | - | B | B | - | Piston pin noise | Piston to piston pin oil clearance Connecting rod bushing oil clearance | Engine Unit: Inspection After Disassembly |
| Slap or rap | A | - | - | B | B | A | Piston slap noise | Piston to cylinder bore clearance Piston ring side clearance Piston ring end gap Connecting rod bend and torsion | Engine Unit: Inspection After Disassembly | |
| Knock | A | B | C | B | B | B | Connecting rod bearing noise | Connecting rod bushing oil clearance Connecting rod bearing oil clearance | Engine Unit: Inspection After Disassembly | |
| Knock | A | B | - | A | B | C | Main bearing noise | Main bearing oil clearance Crankshaft runout | Engine Unit: Inspection After Disassembly | |
| Front of engine Front cover | Tapping or ticking | A | A | - | B | B | B | Timing chain and chain tensioner noise | Timing chain cracks and wear Timing chain tensioner operation | Timing Chain: Removal and Installation |
| Front of engine | Squeaking or fizzing | A | B | - | B | - | B | Drive belt (Sticking or slipping) | Drive belt deflection | Checking Drive Belts |
| Creaking | A | B | A | B | A | B | Drive belt (Slipping) | Idler pulley bearing operation | WATER PUMP: REMOVAL AND INSTALLATION | |
| Squall Creak | A | B | - | B | A | B | Water pump noise | Water pump operation | WATER PUMP: REMOVAL AND INSTALLATION | |
| A: Closely related B: Related C: Sometimes related -: Not related | ||||||||||