I have a 2004 Hyundai Sonata with a ticking noise under the forward passenger side valve cover
My Sonata idles rough with the a/c on and the car in drive. I changed the Idle control valve, cleaned the throttle body, and cleaned the mass air flow. Still have a rough idle. I started the engine while cold and listen with a long screw drive. After a short while and the engine warming up it sound like the valve on the front passenger side started ticking. If so what can I do to get it to stop without doing a major overhaul. And can a sticking valve cause the engine to act like this with the a/c?