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EM-12 < SYSTEM DESCRIPTION > NOISE, VIBRATION, AND HARSHNESS (NVH) TROUBLESHOOTING Use the Chart Below to Help You Find the Cause of the Symptom INFOID:0000000009886398 1. Locate the area where noise occurs. 1. Timing chain 2. Intake valve 3. Exhaust valve 4. Drive belt 5. Water pump A. VTC noise B. Tappet noise C. Camshaft bearing noise D. Valve mechanism E. Rotation mechanism F. Piston pin noise G. Piston slap noise H. Main bearing noise I. Connecting rod bearing noise J. Drive belt noise (slipping) K. Drive belt noise (stick/slipping) L. Water pump noise M. Timing chain and chain tensioner noise Location of noise Type of noise Operating condition of engine Source of noise Check item Refer- ence page Be- fore warm- up After warm- up When start- ing When idling When racing While driv- ing Top of en- Ticking or C A — A B — Tappet noise Valve clearance Rattle C A — A B C Camshaft Camshaft journal clear- Crankshaft Slap or — A — B B — Piston pin Piston and piston pin Slap or A — — B B A Piston slap Piston-to-bore clear- Knock A B C B B B Connecting Connecting rod bushing Knock A B — A B C Main bearing Main bearing oil clear- Front of en- Tapping A A — B B B Timing chain Timing chain cracks |