["Crank To Cam"]
The timing chain synchronizes the rotation of the crankshaft and camshaft(s), ensuring valves open and close at the precise moment for efficient combustion. Signs of a worn chain include: a rattling noise from the engine on startup that quiets after a moment, a check engine light with cam/crank correlation codes, rough running, or reduced performance. A skipped or broken timing chain causes catastrophic engine damage - replace it at the first sign of noise or fault codes.
