Another engine noise thread, your thoughts?
#1
Member
Thread Starter
Join Date: Apr 2010
Location: CHICAGO ILLINOIS
Posts: 114
Likes: 0
Received 1 Like
on
1 Post
Year: 1993
Model: Cherokee
Engine: LEAKY NOISY 4.0
Another engine noise thread, your thoughts?
Hey guys, i have a 93 xj w/ 185k it runs great but there is a knock in my motor. The best i can describe it is, not really a tick or a knock it kinda in between and i can say that ive heard this noise in many 4.o 's. Its not a clacking rocker arm its further down in the head and sounds like its close to the oil fill area. I dont think its a wrist pin because the noise does not speed up with engine rpm, as a matter of fact it goes away just above idle and thrugh the entire rpm range. I bought the truck from a friend who drove it everyday with no issues so im not that worried about driveability, like i said it runs awesome, but the noise is driving me nuts! I really dont like my truck sounding like a diesel, i know lots of you probably had or have this noise, so what did ya do? Thanks!
#3
Member
Thread Starter
Join Date: Apr 2010
Location: CHICAGO ILLINOIS
Posts: 114
Likes: 0
Received 1 Like
on
1 Post
Year: 1993
Model: Cherokee
Engine: LEAKY NOISY 4.0
#5 Defiance665
CF Veteran
Join Date: May 2009
Location: Michigan, 48657
Posts: 3,683
My Photos
1989 Cherokee Year: 1989
Model: Cherokee
Engine: Renix 4.0
Transmission: AW4
Transfer Case: NP231
Front Axle: Dana 30 Vaccum Disconnect
Rear Axle: Dana 35
Tires: 235/75/15
Lift Specifications: 4" rear, 3" front
Misc Accessories: Baja Lights, Electric Fan Switch, Modified Vacuum Disconnect
does it sound like this?
+</SPAN>
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.
IT SUCKS DON'T IT? I'VE ALREADY RULED OUT A ROD KNOCK, BUT IVE HEARD OF PISTON SLAP, WRISTPIN NOISE AND LIFTERS. MY ROCKERS ARE TIGHT AND DONT CLACK SO IDK....... THERES A VIDEO OF A GUY W/ A RED JEEP ON HERE MAKING THE SAME NOISE BUT I DONT KNOW HOW TO ATTACH THE VID, IF YOU SEARCH ENGINE KNOCK YOU'LL FIND HIM ITS ON THE SECOND PAGE I BELIEVE. I SENT HIM A PM HOPEFULLY HE WILL RESPOND. I'LL KEEP U POSTED.....................
CF Veteran
Join Date: May 2009
Location: Michigan, 48657
Posts: 3,683
My Photos
1989 Cherokee Year: 1989
Model: Cherokee
Engine: Renix 4.0
Transmission: AW4
Transfer Case: NP231
Front Axle: Dana 30 Vaccum Disconnect
Rear Axle: Dana 35
Tires: 235/75/15
Lift Specifications: 4" rear, 3" front
Misc Accessories: Baja Lights, Electric Fan Switch, Modified Vacuum Disconnect
does it sound like this?
+</SPAN>
IT SUCKS DON'T IT? I'VE ALREADY RULED OUT A ROD KNOCK, BUT IVE HEARD OF PISTON SLAP, WRISTPIN NOISE AND LIFTERS. MY ROCKERS ARE TIGHT AND DONT CLACK SO IDK....... THERES A VIDEO OF A GUY W/ A RED JEEP ON HERE MAKING THE SAME NOISE BUT I DONT KNOW HOW TO ATTACH THE VID, IF YOU SEARCH ENGINE KNOCK YOU'LL FIND HIM ITS ON THE SECOND PAGE I BELIEVE. I SENT HIM A PM HOPEFULLY HE WILL RESPOND. I'LL KEEP U POSTED.....................
#5
Senior Member
Join Date: Aug 2009
Location: Effingham, N.H.
Posts: 958
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1989
Model: Cherokee
Engine: 4.0 I6
Mine knocks, sounds like a bottom end knock but only does it at like 3,000 rpms- 3,500 and at cold start up. I'm just running it till she blows, then replacing the motor.
#6
CF Veteran
Originally Posted by knoxville
Originally Posted by Defiance665
does it sound like this? http://www.youtube.com/watch?v=http:...?v=LePW9seBwVs
Mine comes from the top end, its always there but gets quieter when its at op temp. Pretty sure its cam/lifters. Just gonna run it till it blows (IF it blows) Ive beat the hell out of it and nothing has happened so far. It hasnt gotten any louder.
#7
Member
Thread Starter
Join Date: Apr 2010
Location: CHICAGO ILLINOIS
Posts: 114
Likes: 0
Received 1 Like
on
1 Post
Year: 1993
Model: Cherokee
Engine: LEAKY NOISY 4.0
trs80, its there no matter what the temp but its only at idle, any rpm above that it goes away. i pulled the valve cover and i have oil coming out of all the rockers, it sounds just like DEFIANCE'S video ( thanks D btw ). i'm not really worried about the motor blowing; i dont think it will, i just want to quiet this thing a bit. i actually thought of just kicking the idle up a bit since that is when the noise goes away. aaahhh i d k this noise is aggravating and embarrasing it sounds like a pos but it runs awesome.........
Trending Topics
#8
knoxville,
To me it sounds like you have some valve train noise. The lifters tend to be 'loud' at idle due to lower oil pressure/flow. Nothing to loose any sleep over.
I have had good luck by running Seafoam through the crack case (right before an oil change). I add some Marvel Mystery Oil to the fresh oil mix and have heard quite the improvement in idle quality. I too am a stickler for how my Xj runs/sounds. Hope this helps.
To me it sounds like you have some valve train noise. The lifters tend to be 'loud' at idle due to lower oil pressure/flow. Nothing to loose any sleep over.
I have had good luck by running Seafoam through the crack case (right before an oil change). I add some Marvel Mystery Oil to the fresh oil mix and have heard quite the improvement in idle quality. I too am a stickler for how my Xj runs/sounds. Hope this helps.
#10
Member
Thread Starter
Join Date: Apr 2010
Location: CHICAGO ILLINOIS
Posts: 114
Likes: 0
Received 1 Like
on
1 Post
Year: 1993
Model: Cherokee
Engine: LEAKY NOISY 4.0
TRS, What brand/weight oil are you using? i cant go too heavy here in Chicago the last few winters have been Brutal................... oh btw i just put seafoam in, i just gotta put some miles on, how many do you think? a hundred or so?
#13
Amsoil is full Syn. I too have 185k on the odom and have had no ill effects from running full syn in engine. Its up to you, Castrol syn blend is another good option if you want to stay away from a full syn. The only problem I see going full syn is that any leaks may become worse as the syn will 'slip' by the seals at a faster rate.
#14
Member
Thread Starter
Join Date: Apr 2010
Location: CHICAGO ILLINOIS
Posts: 114
Likes: 0
Received 1 Like
on
1 Post
Year: 1993
Model: Cherokee
Engine: LEAKY NOISY 4.0
Ok, thanks alot i have a few more miles to go with the seafoam in my oil and i also threw some MMO in the gas just because.I'll reply with results after my 5W30 oil change with MMO; hopefully it works! Thanks again guys