stimp774

when im stopped at the light i get a low rattle. it goes away when i take off or if i put in park. is that the muffler or cat going? or is it maybe just lose.

The entire exhaust is stock. it has 137k.

Next question is - if i decide to replace the entire exhaust system what to go with. i tried to search and found some threads talking about performance curve flowmaster 40 kit. I could not find a list for all i need to order.

Can someone spell it out for the ones who rode the short bus.

I am not messing with headers or glass packs, just need from the factory header back to the bumper everything included reducers, hangers. I will take to a local shop to have it installed and want it all to work obviously so i dont look like a moron.

as for sound not looking for "look at me" loud just a nice growl when i accelerate so people say wow kick *** jeep.

evan00xj

Sure its not your factory plate that covers the side of the gas tank that shields it from.your tailpipe? Mine is doing that right now and its driving me crazy

carlover77

I had the same thing. When I was in neutral at idle it would rattle, when I increased the rpm's it would go away. It sounded like it was coming from the transmission. I had a mechanic check it out and it was something loose inside the transmission. They tightened it up and he noise is gone. Can't remember what it was called though.

greenxj21

Flex plate?

5150Revren

I have the same thing and can look into it today, a saturday. I thought it would be the exhaust rattling on the cross member to the frame but I'm not sure. I just put 2" lift shackles on and it made it worse. I am hoping that someone might be able to post something to let me know what to expect.

89cherokee2gtmudy

My 89 has the same problem so I will be watching this thread. I'm hoping its just the cat shield since I just got my flowmaster welded on after 5 months without a muffler.

Keaton

Try the simple stuff, like your rear most exhaust clamp. Mine rattles at idle too.

sneakyjap96

Heat shield on my cat is makin same noise

stimp774

Very interesting. Did not know I was tapping into a common issue. I guess I will have to get under there and look to see whats going on. My heat shield covering what im not sure maybe the cat got ripped off after hitting some deep water at a decent speed.

I will see if pinpoint it down. the transmission comment was interesting. i thought for sure its exhaust related but who knows.

UPDATE: SAT 2:41 PM

okay so i could not produce it as loud as before but found the same rattle and it sure looks to me to be the muffler. I kept in gear creeping until i got the sound then put on the parking brake to take a look
(keeping my head away from the tire naturally - safety first) I could see the muffler shaking slightly. everything else appeared to be solid. no hole in the muffler but everything is rusted to ****.
maybe its the connection between the back of the muffler and the tail pipe section. i dont know. i think its the muffler. just doesnt seem like cat or trans.

cruiser54

What shape are the engine and trans mounts in?

carlover77

That was it. it cost me $75 to have the shop open it up and tighten it. When I was under the Jeep it was definitely coming from the engine/transmission junction. Hope that helps out.

Lowrange2

I was going to suggest the exhaust rattling on the cross member. I see that all the time.

Btw, 75 bucks wasn't bad but next time you can do that yourself with 2 wrenches and about 15 minutes.

stimp774

sorry to be such a newb but where is the cross member at? i dont know where the mounts are either for that matter.

to carlovers point mine seems to be coming more from the back.
when im in the jeep i hear it coming from the back over my right shoulder. but its harder to identify when i go look at the same spot from outside.

Nothing looks looks its all so rusted, but when i try to move it by hand its all solid in place. the only thing i noticed was a slight vibration in the muffler.

Lowrange2

Here, check this thread.

https://www.cherokeeforum.com/f2/exh...-member-41310/

Zorg2099

I have the same issue on my Jeep. I plan to check it out in 1-2 days.