My 04 XJR 152k all is GREAT, fuel pressure, NO codes or restricted performance BUT I am getting the strangest rattle almost ping noise at high r's right before shifting. Sounds like the engine is coming apart. BUT no knock sensors going off and these cars sensors are hyper sensitive, no cat codes, nothing. I am currently checking all rotating accessories. I already did the main belt power steering is TIGHT, water pump has MINIMAL plat, tensioner seems tight, now for the blower belt next, have you or ANYONE heard of this I am at my wits end.
Well, rattling at high RPMs is often the sign that the bearings are starting to wear on the Piston rods. If you make a YouTube video out of it and send me the URL I'll listen. I only look at YouTube videos. I do not download any videos
