I'm trying to diagnose a loud engine rattle on my 2005 4.0L 6-speed. Here are the characteristics:
- It begins about 20 seconds after a cold start and quiets down significantly (but doesn't completely go away) after the engine is completely warmed up (10 mins or so, at 200F)
- Sounds more substantial than lifter noise (I had lifter noise before and replaced the lifters to remedy it, so I'm familiar with the sound)
- Even when cold, it does not make the noise when the engine is under load/accelerating.
- It gets much louder at idle and when decelerating.
- The noise does not change when the clutch pedal is pressed (it's not the throwout bearing, as I've also replaced that a couple years ago and am familiar what what it sounds like).
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