I have an 04' Tacoma 2.4 liter. The motor is quiet until it reaches operating temperature at which point it begins ticking. The sound seems to emanate from the valve cover area. The motor has 40k on it and burns no oil. The dealership said that they heard nothing but "normal Tacoma noises". A mechanic friend said it might be "pre-cup" noise and that some motors have this characteristic. Namely Jaguar engines (scary). Does anyone have any input on this matter? The noise doesn't particularly bother me but I would like to address any issues before my warranty expires.
Thanks