Cold engine start clicking noise, what is it?

paulmarspaulmars Member Posts: 9
edited January 2016 in Toyota
I replaced my fuel filter on my 2003 2.4L tacoma 2wd. 65k miles. At the same time I
checked the valves. No valve adjustment needed. Now I hear 4 to 6 rapid metallic
clicks when i start the engine cold. Once it happened when it was warm. This fuel
filter is not original equipment.

ideas?

tks,
pa
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