The ticking sound is coming from the valve lifters. When the oil filter is changed, air is introduced into the system, which causes air bubbles to form in the oil. This causes the valve lifters to "leak down", which is what causes the ticking sound. It can take several days for the bubbles to dissipate. It's annoying, but harmless.
Hopefully just a valve lash adjustment.
It's a rocker arm tapping at valve stem. Hydraulic lifters (hydraulic rocker mounts) are the common reason for the ticking. If it doesn't go away when the engine heats up, consider replacing the lifter where the ticking comes from.
The most likely cause of a ticking sound in a motor is a bad timing belt. A valve out of time can also cause a ticking sound.
Code P0300, Intermittent rough idle,
its your lifter ticking really nutting you can do about it dose it on all probes one of there down falls just check the oil level
Valve adjustment needed is a possibility.
you may have a bent valve
The "ticking" sound that is most common among Saturn's is caused by a slightly expanded gap in the valve spacing. It could, of course, be something else, but that seems most common. If that's what's going on, it probably isn't worth much effort to repair. Valve clatter isn't typically a problem unless it gets severe.
Sometimes a ticking sound is a valve lifter. The faster you go the faster the ticking will be. Make sure first it is not something stuck in a tire or something on the fan belt.
?? Lifters not getting enough oil ??
its the needle valve inside the injector opening and closing