Real loud knocking
06-17-2017, 07:45 PM
#1
Newbie
Thread Starter
Join Date: Jun 2017
Posts: 1
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee
Real loud knocking
Yeah. My 1998 jeep grand cherokee has the 4.0 L6 and it is knocking bad all of a sudden. The knocking has always been there that is expected from the straight six which I don't mind at all. This is different. I can turn my radio up a lot and still hear the knocking. It suddenly started while I was driving down the interstate. I think I'm just going to have to pull the head off and replace about a thousand dollars worth of parts. Oh well though.
06-17-2017, 09:31 PM
#2
Senior Member
Join Date: Mar 2010
Location: Alaska
Posts: 589
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee(XJ)
had exactly same happening to our 98 zj just like you described we eventually had loss of power and the jeep started shaking really bad and stumbled home at 20mph its been sitting there since, the knock was always present and 3 different people told me nothing to worry about its just the valves ticking. its still a project i want to fix when the time is right.
how many miles does your zj have ?
marc
how many miles does your zj have ?
marc
06-18-2017, 07:13 PM
#3
::CF Moderator::
Join Date: Aug 2011
Location: Prescott, Az
Posts: 43,855
Received 1,521 Likes
on
1,234 Posts
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Knocking is NOT normal in six cylinder engines...
Auto trans?
Auto trans?
06-18-2017, 08:02 PM
#4
Newbie
Join Date: Jun 2017
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee
[QUOTE=Tyrrel Widdicombe;3399265]if you're handy pull the oil pan and look for pieces of piston skirt.
4.0s are notorious for breaking piston skirts. Just finished this job on my 2000 4.0. it's really not as bad as I was expecting.
Best wishes!!
4.0s are notorious for breaking piston skirts. Just finished this job on my 2000 4.0. it's really not as bad as I was expecting.
Best wishes!!
06-19-2017, 12:32 AM
#6
::CF Moderator::
Join Date: Aug 2011
Location: Prescott, Az
Posts: 43,855
Received 1,521 Likes
on
1,234 Posts
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Use a stethoscope to isolate the knock.
06-21-2017, 08:00 PM
#7
CF Veteran
[QUOTE=williamrobert;3399550]Yeah. Just turned 201,000 miles on my 4.0. Not so notorious for breaking piston skirts I guess.
Trending Topics
06-21-2017, 08:02 PM
#8
::CF Moderator::
Join Date: Aug 2011
Location: Prescott, Az
Posts: 43,855
Received 1,521 Likes
on
1,234 Posts
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Thread
Thread Starter
Forum
Replies
Last Post
marklar134
Stock Grand Cherokee Tech. All ZJ/WJ/WK Non-modified/stock questions go here!
23
12-11-2016 09:29 PM
davyyrowesxj
Stock Grand Cherokee Tech. All ZJ/WJ/WK Non-modified/stock questions go here!
1
10-17-2016 04:28 AM
benmannej1
Stock Grand Cherokee Tech. All ZJ/WJ/WK Non-modified/stock questions go here!
7
02-05-2014 05:32 PM
Kris smith
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
9
01-31-2012 06:28 PM
hudson12787
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
20
11-13-2010 04:58 PM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
