knock knock

[bradleyheathhays]

96 XJ here, 180k 4.0. Recently I've had a repetitive knock sound show up. You don't hear it on a cold start but after it warms up there's a distinctive lower pitched knock with a frequency of about 10 times a second, at idle. Seems to be coming from the bottom of the car/engine as you can hear it better from the sides and rear. The normal engine sounds seem to drown it out when you listen from over or in front of the engine. Not sure if the knocks increase in frequency along with acceleration.

Any ideas?

 

[bradleyheathhays]

What I'm hearing sounds exactly like what's in this video where the guy is fixing his loose flexplate bolt, so I'm going on the assumption that's what I'm dealing with...

https://www.cherokeeforum.com/f51/how-fix-flexplate-knocking-125547/

As this just started would it do much harm to run with it like this for a few weeks? My other vehicle has a more serious problem I'm trying to deal with right now.

 

[ZEN357]

If you are gonna run it, baby it and drive it cautiously and don't make any unnecessary trips until you get it fixed.