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Help me diagnose this 2006 3.7L engine noise

873 views 2 replies 2 participants last post by  BobFromCO 
#1 ·
Can someone help me diagnose this noise in my 2006 Jeep Liberty 3.7L gas engine with 130K miles? Occurs when in or out of gear, moving or not moving. Not tranny, drive shaft, axle or transfer case. Not water pump. Sounds like coming from low and front of engine. Very good independent shop hasn't been able to figure it out (but I haven't left it there long enough for them to tear it down). Runs fine otherwise. Gas mileage normal. Not throwing any codes. Has been going on for months. Not leaking any fluids. Not burning oil. Head gasket fine.
ALL maintenance done at or recommended intervals (in some cases, even more often)
I know I'm throwing all kinds of info out there, but just saying I've checked LOTS of stuff so far. I'm lost.

 
#3 ·
Yes, that weird knocking-like sound. It doesn't change much with RPM. Excellent idea about the drive belt, I'll give it a try this weekend.
I forgot to mention that I did change the drive belt less than 20K miles or so. FWIW, I have changed out the idler and tensioner pulley's while trying to diagnose this.
 
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