I have a 2004 Hyundai Sonata with a ticking noise under the forward passenger side valve cover

Asked by Aug 09, 2016 at 08:12 PM about the 2004 Hyundai Sonata FWD

Question type: Maintenance & Repair

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?

1 Answer


As far as the ticking is concerned change oil and add some Lucas Engine Oil Stablizer to oil. Do not think it has anything to do with a/c but try adding the Lucas first and see what happens it may help stop the running rough with a/c on.

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