it is difficult to diagnose a noise that one cannot hear.
please tell me, what information can I provide that would be helpful to you?
Faint thump almost like heart beat coming from engine only on tick over though comes and goes
this is probably nothing to worry about but it should be verified hands on
it could be an emissions pump cycling or a belt driving component failing
ultimately the noise will need to be traced using a stethoscope and possibly by removing the belts and running the car without them briefly
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