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Is this a valvetrain problem? It goes away when the car is warm, but when cold, the engine has a fairly substantial ticking noise. I was wondering if this is potentially serious, and if this is common with the F-series 4-cylinders.
i've seen a lot of cars with hydraulic lifters tick until warm.....they seem to pump up a little and until they do, they have a little bit of slack.....it could hurt it if you don't let it warm up properly, but if you do it all right, then it won't hurt anything