What is wrong with my car's engine?

Recently, my car's engine has been making strange noises and I am worried that there may be something wrong with it. I have taken it to a mechanic but they were not able to identify the issue. What could be causing this and what steps should I take to fix it?

It could be a number of things, but one possibility is that your timing belt needs to be replaced. If this is the case, it's important to get it fixed as soon as possible to avoid any potential damage to your engine.

Another potential issue could be that you have a leak in your exhaust system. This can cause strange noises and can also affect the overall performance of your car. I recommend taking your car to a different mechanic to get a second opinion.