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NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING EM-21 < SYMPTOM DIAGNOSIS > [MR20DD] C D E F G H I J K L M A EM N P O A: Closely related B: Related C: Sometimes related —: Not related Location of noise Type of noise Operating condition of engine Source of noise Check item Refer- ence page Before warm- up After warm- up When start- ing When idling When racing While driving Top of en- Ticking or C A — A B — Tappet Valve clearance Rattle C A — A B C Camshaft Camshaft journal oil Crank- Slap or — A — B B — Piston pin Piston to piston pin oil Slap or A — — B B A Piston Piston to cylinder bore Knock A B C B B B Connect- 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 Front of Squeak- A B — B — C Drive belt Drive belt deflection Creaking A B A B A B Drive belt Idler pulley bearing op- Squall A B — B A B Water Water pump operation |