If your vehicle is showing engine ticking noise that goes away after the car warms up, here are the most likely causes and the parts you'll need to fix each one.
A small crack in the exhaust manifold or a failing gasket can cause a ticking sound that mimics engine internals. As the engine heats up, the metal expands and temporarily seals the leak, making the noise disappear.
Hydraulic lifters rely on oil pressure to maintain zero valve clearance. If the oil is dirty, low, the wrong viscosity, or the lifter is worn, it will tick until fully pumped up with warm, circulating oil.
In some engines, the aluminum pistons fit slightly loose in the cylinders when cold, causing a hollow tapping or ticking noise. As the engine warms, the pistons expand and fit snugly, stopping the noise.
Variable Valve Timing components rely on oil pressure to function smoothly. A clogged filter screen or worn actuator can cause a ticking or rattling noise on cold starts until oil fully circulates and pressurizes the system.
Hydraulic timing chain tensioners need oil pressure to keep the chain tight. A worn tensioner or stretched chain will allow the chain to slap or tick against the guides until the oil warms up and pressure stabilizes.