Mystery Noise

[Altestry]

My mom’s v6 journey sxt has been making a grinding/rattling noise only below 1k rpm we have already replaced the idler pulley, tensioner, compressor, and alternator. I took the belt off the crank pulley and started the engine and noticed the noise only happened slightly on start up

[5rebel9]

First of all, what was the outcome of the electrical problem you previously posted of?

And now, with all pulleys disconnected from the crankshaft this would indicate possible heat shield rattling on exhaust parts{cat converters, underbody shields} OR a possible bad crank pulley OR even {and I hope not} a cracked flex plate {flywheel}. The latter is rather difficult to fully inspect due to limited viewing area . Time to have a GOOD and REPUTABLE SHOP check it out.

[Altestry]

I believe the original problem was the tensioner not allowing the alternator to charge, because we went through 2 alternators and was still dying and hasn’t died since tensioner replaced. With belt off the noise is only as the starter is engaging noise stops once running and with the belt on noise is worse but kinda comes and goes 

[2late4u]

Most people don't want to change out the belt tensioner,BUT it only makes sense to do that when they are putting on a new belt,but it only makes sense to install a new one,and  yes they can be expensive