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Unread 09-08-2013, 09:23 PM   #1
SPYDERYJ
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'87 YJ Whine***HELP***

Ok so I just picked up my first jeep today, an '87 YJ with 6" shackle lift and 33" tires. The guy I bought it from was trying to track down the cause of a very high pitched whine that it makes when idling. It mostly goes away when you get on the accelerator but if you listen close at low speeds you can still hear it. The strange part is it doesn't start up until it's been running for about 20 mins or so. So far a water pump and clutch have been replaced. A buddy of his suggested that it was the pilot bearing which was changed with the new clutch, but it still makes the sound. So far it is just an annoyance but if anyone has any suggestions on what could be the cause or if it is leading up to a catastrophic failure in something please help me out.

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Unread 09-08-2013, 09:29 PM   #2
jokerchief462
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Vacuum leak maybe heat expands something engine related??? Exhaust leak that doesn't show till its hot???

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Unread 09-08-2013, 09:43 PM   #3
SPYDERYJ
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Exhaust leak wouldn't make a high pitched whine though would it?
And am I mistaken that I'd be having other issues with a vacuum leak like it dying on me or trouble starting?
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Unread 09-08-2013, 10:01 PM   #4
jokerchief462
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Depends how little the space is where the leak is. Shoot a video with sound and post it up. Go to different locations engine bay, cab and maybe crawl underneath. There is a ton of folks could answer that way.

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Unread 09-08-2013, 10:41 PM   #5
SPYDERYJ
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I will try to do a video with the sound when I get a chance, my wife is due to give birth to a son any day now so that is taking up most of my time.
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Unread 09-08-2013, 10:43 PM   #6
jokerchief462
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Oh yes priorities!!! Congrats!!!

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Unread 09-08-2013, 10:44 PM   #7
SPYDERYJ
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Thanks, my 5 yr old daughter thinks that the jeep is the greatest thing on the planet already and I've had it for less than 4 hours lol.
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Unread 09-08-2013, 10:45 PM   #8
Gage56
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Id say the alt mine has all ways had a hi pitch whine
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This is a prime example why people should be give a IQ test before they are allowed to Vote or Breed.
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Unread 09-08-2013, 10:46 PM   #9
SPYDERYJ
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I'll have to check that out as well.
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Unread 09-09-2013, 12:43 AM   #10
jred
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If you suspect one of the accessories' bearings, you can use a long screwdriver as a stethoscope. Put the handle end to your ear & put the tip on the different parts until you find it.

That said, I'd look at the vacuum lines.
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Unread 09-09-2013, 05:00 AM   #11
Que89YJ
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You can narrow it down easy by just removing the belt in the front and see if it goes away. You can spend hours with carb cleaner and scoping but you need to know if it's from the moving parts our not. Alternator and the idler pulley are usual suspects.
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Unread 09-09-2013, 06:40 AM   #12
WDNewman
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Quote:
Originally Posted by Que89YJ View Post
You can narrow it down easy by just removing the belt in the front and see if it goes away. You can spend hours with carb cleaner and scoping but you need to know if it's from the moving parts our not. Alternator and the idler pulley are usual suspects.
I agree with this one. Easy check on the usual suspects.
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Unread 09-09-2013, 09:12 PM   #13
SPYDERYJ
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I will try removing the belt, the closest thing to describe the sound is a tea kettle....which kinda detracts from the whole jeep persona, mini maybe, but a jeep shouldn't sound like a tea kettle lol.
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Unread 09-10-2013, 10:44 PM   #14
Gage56
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here is what my noise sounds like and i know its the alt

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http://www.jeepforum.com/forum/f12/s...x-how-1607617/


Quote:
Originally Posted by Tom95YJ View Post
This is a prime example why people should be give a IQ test before they are allowed to Vote or Breed.
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Unread 09-10-2013, 11:16 PM   #15
SPYDERYJ
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Belt didn't change anything, tracking down vacuum lines in the rear driver's side of the engine now. Does anyone have a rough schematic of what some of the vacuum outlets on the top of the engine go to because I have one that doesn't have a line on it and would kind of like to track that down.
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