Timing chain cover leak in a 2014 Lexus IS350 is a relatively common issue for vehicles 3.5 liter engine 2GR-FSE. The leak typically occurs due to a failing gasket or sealant on the timing chain cover. Here’s what you need to know: Symptoms of a Timing Chain Cover Leak 1. Oil Leaks: Visible oil on the engine or under the car in which can cause a fire in engine compartment 2. Burning Oil Smell: Oil dripping onto hot components may cause a noticeable odor. 3. Low Oil Levels: Frequent topping up of engine oil.