I have a 2001 Ford Focus with the 2.0L Zetec engine and I have recently developed a ticking/tapping noise that sounds like its coming from top-engine. It’s not throwing a code or performing any different than it had before the noise appeared. I have changed spark plugs and wires and done an oil change (per a mechanics recommendation) but the noise is still there. The ticking noise doesn’t go away when the engine rpms increase and I tried some sea foam recently to try and clear/unstick any possible injectors, lifters, etc. if anyone has any ideas on what it could be or has had an experience with this please let me know thanks!