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Unread 09-11-2013, 04:48 AM   #16
Que89YJ
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1989 YJ Wrangler 
 
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If it is a vacuum issue then start by spraying around with carb cleaner and see if the idle changes.

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Unread 09-11-2013, 09:24 AM   #17
DustyGeneral
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I have a thread going on about my YJ's noise. sounds exactly like your problem. 99.99% sure it's my alt. I am going to change it out on Friday. Here's what I did.

http://www.jeepforum.com/forum/f12/w...noise-1573638/
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Unread 09-11-2013, 10:04 AM   #18
gtg413i
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I did a detailed post on swapping the 140 amp alternator (cs144 alternator swap into yj). It is real cheap too. I also vote your issue is the alternator bearing. The part store guy told me those are pressed on so you cant easily replace it. Better to get a new one. My grand cherokee alternator whines at me very loud. Need to fix that one day.
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Unread 09-11-2013, 09:02 PM   #19
SPYDERYJ
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Well I got another opinion today that thinks its the power steering bearing starting to go. The alt is fine, no power issues and took the belt off of it and sound remained. I am going to remove the power steering belt probably tomorrow and check it and if that's it hope and pray they have one on Oahu!
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Unread 09-24-2013, 04:03 AM   #20
SPYDERYJ
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Anybody got any good advice on the easiest way to troubleshoot a crank/camshaft bearing without doing a partial rebuild? I've already down a full oil change with heavier oil and it didn't alter the sound or how long it takes for the sound to come on.
Also is there any ballpark on how much it would be for a 2.5L "rebuild kit". Now I'm not saying that there is an actual kit with new consumables (unless there actually is one) but if anyone has done one of these recently please let me know about how much it cost you. I'm weighing my options as I have my eye on a couple possible engines for swap but can't find any with manual trans and I know I can't put an AX-5 onto a 4.0L.
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Unread 09-24-2013, 01:05 PM   #21
Que89YJ
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You can put an aw4 into it if you find one with a 4.0l. it is a little work swapping and welding but doable. Without knowing what you are dealing with it is impossible to figure cost. Miles should come into play on deciding wether you should just do a bearing swap. There was a marine on here Kelti who just dropped the pan and popped in all the bearings and drove the thing into the ground until he snapped the frame. To isolate the noise you need a stethiscope or a long piece of metal like and extension or big screwdriver.

https://www.youtube.com/watch?v=RJOn-f_M8d8

There are a bunch of possibilities for noise. Oil pump, timing chain distributor bearing. Try and isolate it down. I am not saying it isnt the engine itself but the 2.5 and 4.0l are both great engines and regularly get more 250,000. I am going to PM you a member here on the forum. He is in Hawaii. He might be able to direct you to some parts when you figure out where the noise is coming from.
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Unread 09-25-2013, 12:51 AM   #22
ashland82391
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Surprised no one has said idler pulley... Have you removed the serpentine belt and start it to see if the sound went away?
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Unread 09-25-2013, 01:24 AM   #23
SPYDERYJ
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It's a 2.5L so no serpentine belt. But yes I've removed both the belts.
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Unread 09-25-2013, 01:33 AM   #24
ashland82391
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Quote:
Originally Posted by SPYDERYJ View Post
It's a 2.5L so no serpentine belt. But yes I've removed both the belts.
Nope, 2.5 definitely had a serpentine belt.
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Unread 09-25-2013, 07:43 AM   #25
SPYDERYJ
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They have either serpentine or dual belt configuration sorry. Mine is the dual belt.
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Unread 09-25-2013, 10:26 AM   #26
Que89YJ
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Look at this video and you will get an idea of where the distributor and oil pump sit inside the engine. The distributor gear drives the oil pump from the cam shaft gear on the distributor. I hope it helps you get an idea because you said the noise was in the middle:
https://www.youtube.com/watch?v=RSpREm5Qazk
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