yesterday, i cleaned out my purge valve with a comination of carb cleaner and some wd-40, and have noticed that it now pulses/cycles when the engine is at operating temp. from what i've read so far, it seems like the purge valve should turn on only after the engine reaches operating temperature(above 70c). is this correct, or should it cycle even on cold starts? if anyone could provide me with an answer, i would really appreciate it .

thanks,
tim