Intermittent tappet sound at idle speed?? - Jag V8 4.0 1998

[W5Plumbers]

This sound comes and goes with a blip of the throttle, can anyone advise on how this happens and any way to treat?

Thanks

[W5Plumbers]

Hi Ian and thanks for the reply, I can take a video clip when back after the break but in the mean time I can tell you the engine runs perfect, does not miss a beat hot or cold with a silent start up and zero noise chains ( so can only assume that tensioners have not yet split if they are the early type) the noise emanates from the top end left bank, I would say but really need to get a rod to it and to my ear to be 100% from which cylinder, its definitely not injector noise. As mentioned it comes and goes (slowly creeps in after getting warm then cleared with a blip of the throttle) miles are 100k now but years ago I had the same problem on a jag V8 with only 27k miles but sold it so never got to investigate further. Could it be a hydraulic tappet??

Thanks
Aaron