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Use the table below to help you find the cause of the symptom. NVH Troubleshooting — Engine Noise NCEM0005S01 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 driv- ing Top of Ticking or C A — A B — Tappet Hydraulic lash adjuster Rattle C A — A B C Camshaft Camshaft journal clear- Crankshaft Slap or — A — B B — Piston pin Piston and piston pin Slap or rap A — — B B A Piston slap Piston-to-bore clearance Knock A B C B B B Connecting Connecting rod bushing Knock A B — A B C Main bear- Main bearing oil clear- Front of Tapping or A A — B B B Timing Timing chain cracks and Front of Squeaking A B — B — C Other drive Drive belt deflection MA-13, Creaking A B A B A B Other drive Idler pulley bearing Squall A B — B A B Water Water pump operation LC-11, A: Closely related B: Related C: Sometimes related —: Not related GI MA LC EC FE CL MT AT AX SU BR ST RS BT HA SC EL IDX NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING EM-9 |