Ive checked all the codes (none), tensioners look fine, car runs great. RPMs are good, oil pressure good, power good, car starts up with no problems, has new harness, new motor mount, all fluids changed at regular intervals. But when in gear, and stopped there is a rattle coming from what seems to be the upper right of the engine, It seems to be coming from the valve train. I've used a mechanic's stethoscope and from what I can tell the noise is coming from the top right (if you are looking at the engine) front of the engine. Another thing that happens is that when in gear and stopped the idle is a little lumpy, causes a noticeable vibration in the car, and a annoying sub-bass sound, not quiet and smooth. I have been racking my brains and looking everywhere as to what it might be. The car has 122k miles and has Mobile 1 oil and only premium fuel. At idle and in Park its normal, smooth as it should be and acceleration and performance is great as well.
Can it be worn valvetrain? Timing chain? Timing chain guide? Camshaft adjuster?
Can it be worn valvetrain? Timing chain? Timing chain guide? Camshaft adjuster?
