The ticking noise you hear when you start your engine could be due to several reasons:

1. **Lack of Proper Lubrication**: The ticking noise could be a result of inadequate lubrication in the engine. This can be caused by low oil levels, poor quality oil, or oil that has not been changed regularly.

2. **Valve Train Issues**: The ticking noise could also be related to the valve train components, such as the lifters, rockers, or camshaft. These components may be worn out or not receiving enough oil to operate smoothly.

3. **Exhaust Manifold Leak**: A ticking noise could also be caused by a leak in the exhaust manifold. This is typically a fast ticking noise that may be more noticeable when the engine is cold.

4. **Spark Knock**: If the ticking noise is more of a metallic ping that occurs under load, it could be a spark knock. This is caused by improper combustion in the cylinders and can be detrimental to the engine if not addressed.

5. **Timing Chain Tensioner**: A failing timing chain tensioner can also produce a ticking noise, especially on startup. If the tensioner is not maintaining the correct tension on the timing chain, it can lead to noise and potential engine damage.

It is essential to have a qualified mechanic inspect your vehicle to diagnose the exact cause of the ticking noise. Ignoring the issue may lead to more severe problems and costly repairs down the line.