I just picked up a Cherokee a week or so ago and when it idles it randomly has a hollow knocking sound. Motor has full power and drives fine. We thought maybe the flywheel was broke but we pulled the trans and it was fine. Any ideas?? I can send a video via text of the noise if that helps. 231-632-1555. Thanks

 

Is this an automatic? If so, you might check the 6 or so bolts that anchor the flywheel to the torque convertor. If some changed something out and didn't torque those down to spec they can work loose and create a similar sound.

 

does it do this just in gear? mine does this when its in gear and i have my foot on the brake. if i put on the e brake and take my foot off the brake it goes away. still trying to figure it out

 

I would doubt that being in gear or park would affect it if the bolts were loose. I suppose there is a small chance if the bolts have worked just far enough out that with the Jeep in gear the distance gap between the engine and flywheel shifts and one of the bolts starts hitting something.

Easy inspection though. Just remove the same inspection cover you used when you looked at the flywheel, manually turn the flywheel and with a light look up inside. If the bolts are flush and tight that is not the problem, if the bolts are sticking out, it might be the issue, torque them down.

 

Talked to my master mind mechanic and he says the cam shafts on these wear out and clunk around. He says it doesn't hurt anything just makes noise

 

what do you mean knocking, can you hear inside around you ****er area? out off all these that have come in to the dealership i have never heard of the cam wearing out.