Hello all, I am fairly new to the Jaguar world but I did a lot of research before I made my purchase ( I bought a 1998 XJ8). The service records show that the timing chains and the tensioners were replaced and when I had some work done recently, my mechanic said he inspected the primary tensioners and they had indeed been replaced with the upgraded models. When I start the car cold it was fine and no issues to speak of, but as it warms at a low idle a slight ticking starts in the engine. If I rev the engine once the ticking keeps pace with the RPMs but if I rev it a second time, the ticking starts to speed up but then you can hear an audible CLICK and the ticking stops til the engine has been at low idle for a while again. I am concerned that one of the secondaries or even one of the primary replacements is going bad and is "popping" to full extension when I rev it enough to get enough hydrolic pressure in it, The ticking never seems to get worse and never occurs at high idle. The car runs flawlessly other than that noise..I am not sure where I should be looking. Thanks for your time

 

Welcome! you'll get more help in the proper forum (this is for the X350 models; 2003+) different animal from your 98.
Maybe a mod can move your post!