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|3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.|
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Originally Posted by peterkulesza
this is lifter noise. do not take action unless the car is on warranty.
the lifters have a little piston built in. this is to accomodate the forces pressing on the valvles from the camshaft. the lifters have holes, which allow fill/empty cycle, using engine oil. the holes often get plugged up with junk, so the lifters occasionally do not "pump up" in time, do not follow the cam profile, and hence produce the ticking noise. cold start (that is dense oil) is when this happens, once oil gets warm and viscosity drops, flow is restored, and everything is quiet.
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