Hi Everyone, first post for me... So basically I wanted some of your wisdom with a tapping/clicking noise I'm having with a Dmax I recently acquired. It's an 07 TFS77 with the 4JH1-TC 3 litre engine and has 88,000miles on the clock. Have no issues, no smoke, no hesitation, reasonable mpg apart from an annoying clicking, tapping noise which is noticeable on idle and and when tapping the gas pedal on very low revs, noise completely silenced when accelerating or over 1500rpm or so.. Been to 2 mechanic's and 2 diesel experts and no one would pinpoint directly the issue, mechanic's took the easy way..Replace the lot, Diesel guys said no it's not coming from the injectors although one pointed me out to check the vacuum pump ... I uploaded a short clip of the noise hopefully somebody can shed some light.
YouTube Video here https://youtu.be/gUIjND6tyUM