How can you tell if timing chain needs to be replaced?

Hello, Dave here, contributing to RepairPal and providing expert advice since 2010. A timing chain breaking would be extremely unusual. It is not a belt, but a metal chain, and there is not reason to expect this part would fracture. As far as the car filling with smoke, there are other serious possible issues in play, but everything requires hands on inspection to evaluate and determine what has happened. I would recommend a shop near you evaluate the vehicle and find out what is happening. https://repairpal.com/auto-repair-near-me Click the link or call us at 877-913-1554. We'll gladly find you a certified RepairPal shop in your area.