anyone have a knocking sound in a 4.0 engine? - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ General Discussion Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 06-08-2011, 09:20 PM   #1
Jeeper
 
Join Date: Apr 2011
Posts: 90
anyone have a knocking sound in a 4.0 engine?

it doesnt knock like a rod or berring. more of a hollow sound. ive been told exaust and normal piston slap.. any info?

also wanting to look into getting rid of death wobble? im not sure if i have it. i get to about 57 mph and the jeep shakes and then goes away for a sec then comes and goes like that only past like 57 mph.. any ideas on that?

then also doing a brake job this week.. any ideas on a certain pad brand or type as far as ceramics or what ever.
and how hard are the drum brakes to do?

thanks yall (:

rmburwell is offline   Quote Quick Reply
Old 06-08-2011, 09:27 PM   #2
Jeeper
 
NUTnOUT's Avatar
 
Join Date: Nov 2010
Location: Washington State
Posts: 251
sorry can't help u but i think i have the same noise going on so i am subscribing to this thread. I know for sure i have an exhaust leak somewhere just haven't looked too hard for it.

NUTnOUT is offline   Quote Quick Reply
Old 06-08-2011, 09:37 PM   #3
Jeeper
 
freeskier's Avatar
 
Join Date: Mar 2011
Location: Longmont, CO
Posts: 2,541
The knocking could be lifter tick, which is common in pretty much every 4.0. Does it always make the sound? Or just on warm up? It could also be much worse, It's unlikely but it could be a broken piston skirt.

Another simple test is next fill up put a little bit of premium gas in to rule out pre-detonation (knock/ping).
__________________
CU Boulder Aerospace Engineering
freeskier is online now   Quote Quick Reply
Old 06-08-2011, 09:39 PM   #4
Jeeper
 
Shelby427's Avatar
 
Join Date: May 2011
Location: Lakeland FL and Hooversville PA
Posts: 2,130
Jeeps make all kinds of noises, just do a you tube search for engine noises.
Piston slap, exhaust leaks, lifter noises, and so on.

As for DW, you'll know it when it happens. It will pucker you right up. Usually occurs if you hit a bump, or a dip in the road a certain way. Yours sounds more like a tire balance or tire problems.

Do a search on brake pads, there are a few out there that folks swear by.

Drums aren't bad, especially if you have the spring tools. Have to watch, some had the old mopar style lining. Instead of a full lining on the shoes, they have 2, with a space between em. If the lining is worn out, it can groove the drums to the point that the only way to remove the drum is to back off the adjuster all the way.

And if you are doing it yourself, do one side at a time, that way you can peek at the other side when reassembling, to confirm how it goes back together.
__________________
97 Sahara, 74 Renegade, 72 CJ5, 55 Willy's (the Beast) Boss 302, 6:34 gearing, Bose 901 speakers.
God I miss that Jeep. Forgot the kinda Jeep, 80 SX4.
Shelby427 is offline   Quote Quick Reply
Old 06-08-2011, 09:56 PM   #5
MallCrawler

WF Supporting Member
::WF Moderator::
 
kjeeper10's Avatar
 
Join Date: Feb 2011
Location: Connecticut
Posts: 35,342
Im assuming I have some piston slap going on. Noise only there when I start the jeep and gone after about a minute or two. My Yj had a lifter tick and was loader when started till the oils made it's way up to the top of the engine, but I could still hear it a little while driving. Both are pretty common as far as the 4.0
I have 160,000 on my 01 so I'm not really worried about it. She is pretty quite after warming up.
__________________
2007 Rubicon/Rock Krawler triple rate 2.5" coils/RK rear TB w/ a teraflex raised bracket/Rancho 9000 31/32XL shocks/Synergy flipped draglink,ball joints,tie rod /Hankook MT 315-75-16 on Level 8 ZX's/Rancho geo brackets/Ruff stuff uppers/Fox ATS stabilizer/Adams front DS/Artec front armor w/ Currie upper bushings/Rancho cat back exhaust.

Lifting your JK? Read this!!



Click HERE to become a WranglerForum Supporting Member!
kjeeper10 is online now   Quote Quick Reply
Old 06-08-2011, 10:41 PM   #6
Jeeper
 
Join Date: Apr 2011
Posts: 90
yeah its only until the engine is warm and then the "knock" goes away. the dealer said normal piston slap for those motors. idk and there is a slight lifter tick but not very much. the other noise is differant and cant find a good sounding youtube video to get an idea lol
rmburwell is offline   Quote Quick Reply
Old 06-08-2011, 10:55 PM   #7
Newb
 
Join Date: May 2011
Posts: 4
The noise is most likely lifter tick. Very Common. Should hurt anything. You can have this fixed by replacing the lifters. It's around 500-600 bucks at a jeep dealership.

The death wobble - replace your steering stabilizer and make sure your tires are well balanced. Should fix it right up. I recommend an OME (Old Man Emu) steering stabilizer. Best bang for the buck. I replaced my stock with a OME steering stabilizer when I got the death wobbles... fixed it right up. Hasn't come back.

Good Luck
BrooksWV is offline   Quote Quick Reply
Old 06-09-2011, 08:46 AM   #8
Jeeper

WF Supporting Member
 
Double_Trouble's Avatar
 
Join Date: Mar 2011
Posts: 269
Quote:
Originally Posted by Shelby427 View Post
Jeeps make all kinds of noises,
Word!

Double_Trouble is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
rebuilding your engine?? Get Stroked!!! jeeper95yj YJ General Discussion Forum 6 01-01-2014 04:47 PM
Help, I need advise with sound system. bear3351 JK General Discussion Forum 33 06-18-2012 09:30 PM
2.5l Engine Woes. (Sludge and sounds like marbles) jpotts TJ General Discussion Forum 9 05-19-2011 11:47 PM
Engine knocking stabs05 TJ Tech Forum 8 08-16-2007 07:08 PM
knocking sound from front when turning? mohunter TJ Tech Forum 2 10-11-2006 11:24 AM



» Featured Product

All times are GMT -5. The time now is 10:41 PM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC