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EM-4 < SYMPTOM DIAGNOSIS > NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING Use the Chart Below to Help You Find the Cause of the Symptom INFOID:0000000003802223 1. Locate the area where noise occurs. 2. Confirm the type of noise. 3. Specify the operating condition of the engine. 4. Check specified noise source. 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 runout 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 |