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what causes an 01 to tick after replacing ol sending unit? on 2000 Mercury Villager

I replaced the oil sending unit & the ticking stopped but now it is doing it again is it possible that the part i bought has a manufactured defect or is there something else that needs to be replaced i am so tired of spending money and it NEVER fixes the problem PLEASE HELP!!!

Asked by for the 2000 Mercury Villager
Test oil pressure with a gauge. Is the 'ticking' more noticable after engine reaches operating temp.? What SPECIFIC conditions make it better or worse? How many miles on engine?
3 more answers
Test oil pressure with a gauge. Is the 'ticking' more noticable after engine reaches operating temp.? What SPECIFIC conditions make it better or worse? How many miles on engine?
If it has adjustable rocker arms one could be loose or you could have a bad lifter take the rocker cover off and start the engine and check where the noise is coming from
how loud is the ticking