NAXJA Forums -::- North American XJ Association  

Go Back   NAXJA Forums -::- North American XJ Association > NAXJA Unibody Jeep Technical Forums > Jeep Cherokee XJ (1984 - 2001) > OEM Tech Discussion
HOME Member FAQ Sponsor Info Rules Bylaws E-Mail

OEM Tech Discussion Forum for OEM (Original Equipment) or stock XJs and MJs.

Reply
 
Thread Tools Display Modes
  #1  
Old January 13th, 2020, 12:34
fjxj0103's Avatar
fjxj0103 fjxj0103 is offline
NAXJA Forum User
 
Join Date: Sep 2019
Location: Michigan
Posts: 12
Strange Clacking sound when letting off...

This is my first post so bear with me here...

2001 Jeep Cherokee Sport.

4.0L I6, stock.

AW4 Auto, 231 T-Case.

189,095 miles.

No ABS, or TC.

Ok, so on my drive home, there was this strange sound that seemed like it was coming from the engine. I know the 4.0 is a somewhat noisy engine (at least mine is, and always has been), but sometimes when I would let off at 40-60 mph, I would hear a loud clacking sound for about half a second, and then it would go away, This happened twice on my 15 minute drive. I am extremely diligent about changing the oil every 3000 miles, and I ALWAYS let it warm up to at least 160 before I start moving. The oil pressure is great, 50psi @1000rpm even when warm. I drive normally but sometimes I like to have a bit of fun.

What could this be? I know quite a lot about the 4.0 but Iíve never heard it do this nor heard anyone else talk about it. I would make a video of the sound but in case there is really something wrong I obviously donít want to try and reproduce it.


Sent from my iPhone using Tapatalk
Reply With Quote
  #2  
Old January 13th, 2020, 12:42
lawsoncl lawsoncl is offline
NAXJA Forum User
 
Join Date: Jan 2006
Location: North Idaho
Posts: 5,270
Re: Strange Clacking sound when letting off...

Not sure what you mean by "no TC"?


I'd maybe look at the motor and transmission mounts, and make sure it's not the engine moving enough that the fan hits. If it sounds like it's under your feet, it could be the exhaust hitting the crossmember. Also, check the torque converter bolts are tight although that's usually more noticeable at idle and sound like it's in the bell housing.
Reply With Quote
  #3  
Old January 13th, 2020, 12:50
fjxj0103's Avatar
fjxj0103 fjxj0103 is offline
NAXJA Forum User
 
Join Date: Sep 2019
Location: Michigan
Posts: 12
Strange Clacking sound when letting off...

Thanks for the suggestions, it does sound like itís coming from the front, so maybe I will temporarily remove the shroud to see if it stops. I meant TC as In Traction Control, but now I just remembered that they didnít ever come with that I donít think.


Sent from my iPhone using Tapatalk
Reply With Quote
  #4  
Old January 13th, 2020, 15:29
Tim_MN's Avatar
Tim_MN Tim_MN is offline
Freakish Hand Strength
 
Join Date: Mar 2003
Location: Minneapolis, MN
Posts: 7,048
Re: Strange Clacking sound when letting off...

Check the items already suggested, and also check the Harmonic Balancer. My 1998 made some loud metallic clacking noises, the Harmonic Balancer was failing and something was hitting something else.
__________________
.
.

Quote:
Originally Posted by bimmerjeeper

People are dumbfounded when I tell them I know how to change the spark plugs on a car.

Last edited by Tim_MN; January 13th, 2020 at 15:35.
Reply With Quote
  #5  
Old January 14th, 2020, 13:16
fjxj0103's Avatar
fjxj0103 fjxj0103 is offline
NAXJA Forum User
 
Join Date: Sep 2019
Location: Michigan
Posts: 12
Re: Strange Clacking sound when letting off...

Problem solved! Checked the motor/transmission mounts, they were O.K., I did end up adjusting the exhaust a little as it was rattling a bit (its aftermarket). I got to the harmonic balancer and noticed a bolt was backing out and scraping against it. I finagled a wrench up into there and tightened it back down and haven't heard it since, I'm not really sure why it would only be audible when letting off though, there's no play in the crank, but the sound is gone so I must've done something that worked .


-Thanks for the help guys!
Reply With Quote
  #6  
Old January 14th, 2020, 14:01
old_man's Avatar
old_man old_man is offline
NAXJA Member
 
Join Date: May 2003
Location: Loveland, Colorado
Posts: 15,826
Re: Strange Clacking sound when letting off...

Don't look a gift horse in the mouth.
__________________
Tom Houston - Former Colorado Chapter President, current Treasurer , Terminal Adrenaline Junkie, and Rocket Scientist
Loveland, Colorado My teardrop build
You're just jealous because the voices don't talk to you.
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Strange Knocking sound? Help? noChrome71 OEM Tech Discussion 8 July 30th, 2009 18:59
Strange sound, any ideas? Brunoô Modified Tech Discussion 17 October 4th, 2008 19:18
92XJ with strange sound from rear... carl.schaible OEM Tech Discussion 7 October 26th, 2005 19:29
strange sound, please help h_2_o Tow Rigs and Trailers 0 August 27th, 2004 10:30
Loud clacking sound from front of tranny in park Jackhill442 OEM Tech Discussion 6 July 5th, 2004 06:44


All times are GMT -7. The time now is 09:47.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
NAXJA and NAXJA logo's Copyright NAXJA. All content/images Copyright NAXJA 1999-2014