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Unread 07-06-2010, 12:08 AM   #1
redmater06
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Rattling noise while idling

Yeah i got an 06 TJ and i keep hearing this weird noise when im sitting at idle. First off what should the 4.0L idle at cuz to me its pretty low but i dont know im used to my diesel truck idling high.

Anyway, at idle i here this weird rattling kind of sound. It sounds like its coming from underneath the jeep where the driver sits. Strange thing is when i push the clutch in the noise goes away and soon as i let off the clutch the noise comes back...any ideas??? sounds like it is coming from around the trans somewhere

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Unread 07-06-2010, 05:35 AM   #2
TheBoogieman
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Idle is 600 rpms.Crawl under it and take a look for the rattle.
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Unread 07-06-2010, 06:06 AM   #3
ChrisYJ - Italy
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Could be your cat converter gone bad, or something exhaust related anyways. Usually those are the culprits for this kind of rattle. You must go and check it yourself tho!
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Unread 07-06-2010, 06:13 AM   #4
Rivx
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My transmission rattles like you describe. pretty sure every thread on the subject says it's normal.

Last edited by Rivx; 07-06-2010 at 07:35 AM.. Reason: wording
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Unread 07-06-2010, 07:07 AM   #5
Sundowner
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If you had an NV3550, I would tell you not to worry...

I noticed the same problem a week or two ago, and it's just a fact of life with TJ's with the 3550 transmission...the shafts turning with nothing to do (so to speak) make a lot of noise. Some do it worse than others. Two factors that make it worse are heat, and older tranny fluid (in my experience). I replaced the old fluid with some new Syncromesh and it quieted the rattles by about half. When you push in the clutch, the noise goes away...

With the newer 6-speed, I can't say. I don't know if it's known to have the same noises, or not.
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Unread 07-06-2010, 09:01 AM   #6
redmater06
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Thanks alot. I have crawled under and checked it a few days ago and before i checked it i thought it was the cat but like sundowner and the other person says its coming from the transmission and i guess thats normal?
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Unread 07-06-2010, 09:15 AM   #7
Sundowner
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It's normal for the NV3550. I'm not sure about the 6-speeds, although I did some quick searching on the matter and discovered that it can make similar noises for a variety of reasons. I'd suggest you start your investigation under that premise.
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Unread 07-06-2010, 10:43 AM   #8
Ben10281
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I have an '06 with the NSG370 6 speed and Dana 44 rear and Dana 30 front like you. I bought the Jeep new from the dealer and have had this issue since the day I drove it off the lot. My jeep has just over 60K on it and the rattle has never gotten worse. I have always done the normal preventative maintenance on time as well. I always thought it sounded like rattling coming from the clutch pedal linkage. It tends to diminish/go away when I put a small amount of pressure on the clutch pedal or if I push in the clutch pedal all the way. That is what I attributed it to. Never seemed to cause any problems for me. I did have a problem with the cluctch relay switch that prevented the Jeep from starting, but that was replaced under warranty.
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Unread 07-06-2010, 10:47 AM   #9
Sundowner
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Then it sounds like an identical issue to the NV3550. No worries unless it's unreasonably loud.

Same advice I got: go drive a few TJ's that belong to your buddies. If yours seems louder or radically different, then start troubleshooting.
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Unread 07-07-2010, 12:59 AM   #10
redmater06
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Ben10281 u hit the nail on the head. my jeep does the exact thing you just described. i guess this is normal then if you havent had any problems and its happened on other tranny's. Thanks alot
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Unread 05-08-2011, 08:58 AM   #11
JeepNaked9969
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HMM, i have a 2006 TJ, Dana 44 rear, 30 front, 6spd transmission and i JUST noticed a weird rattle sound, and after getting under the jeep, it sounds like it is coming from the transmission. almost right where it meets the engine. If you guys are still monitoring this post, is this about what you guys are hearing as well? like i said, never heard it before, and, like my name says, drive my jeep naked as much as possible. its loud right when i start it, and gets a little quieter after its driven. seems to go away when the rpms are higher, but it the noise could be drowned out by the engine noise. its actually kind of annoying. anyway, if anybody on this thread that has similar problems, just confirm that it hasnt gotten worse, and that its coming from roughly the front of the transmission near the engine. THANKS! AND JEEPNAKED!
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Unread 05-08-2011, 10:28 AM   #12
nkorep2
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I had a rattle like that in a nissan 200sx, turned out to be a bracket holding the exhaust up.
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Unread 06-07-2011, 03:03 PM   #13
Ghetto2315
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I have the same thing on my 01 TJ with the NV3550. Getting it checked out by a Jeep specialist on Thurs. So you guys say this is normal?
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Unread 06-07-2011, 05:26 PM   #14
NCJeeping
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Quote:
Originally Posted by Ghetto2315 View Post
I have the same thing on my 01 TJ with the NV3550. Getting it checked out by a Jeep specialist on Thurs. So you guys say this is normal?
Yes it is normal for the NV3550. Mine does it too and I'm not worried. It's a Jeep, it's going to make unexplainable noises.
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Unread 03-21-2012, 10:39 PM   #15
Jesse2609
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Idle noise

Hi i have a 2005 6 speed manual tj and i bought it used, anyway also when i idle it makes that rattle noise in the transmission, once i put the clutch in it goes away then let out it comes back. I had someone listen to it they said it sounded like the throughout bearing. idk just thought i'd put mine in as well.
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