post #1 of Old 09-08-2013, 08:23 PM Thread Starter
SPYDERYJ
Registered User
1987 YJ Wrangler 
 
Join Date: Sep 2013
Location: Waianae
Posts: 33
'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.

SPYDERYJ is offline  
post #2 of Old 09-08-2013, 08:29 PM
jokerchief462
Registered User
1989 YJ Wrangler 
 
Join Date: Nov 2010
Location: Sin City
Posts: 2,881
Vacuum leak maybe heat expands something engine related??? Exhaust leak that doesn't show till its hot???

Sent from underneath my Jeep

89YJ 2.5L TBI, AX-5, NP231 SYE, Ford 8.8, Yukon Grizzly, Tom Woods Shaft, 33" BFG T/As, 4" lift, Warn VR10000s.

AF Jeep Club Tail #184
jokerchief462 is offline  
post #3 of Old 09-08-2013, 08:43 PM Thread Starter
SPYDERYJ
Registered User
1987 YJ Wrangler 
 
Join Date: Sep 2013
Location: Waianae
Posts: 33
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?
SPYDERYJ is offline  
post #4 of Old 09-08-2013, 09:01 PM
jokerchief462
Registered User
1989 YJ Wrangler 
 
Join Date: Nov 2010
Location: Sin City
Posts: 2,881
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.

Sent from underneath my Jeep

89YJ 2.5L TBI, AX-5, NP231 SYE, Ford 8.8, Yukon Grizzly, Tom Woods Shaft, 33" BFG T/As, 4" lift, Warn VR10000s.

AF Jeep Club Tail #184
jokerchief462 is offline  
post #5 of Old 09-08-2013, 09:41 PM Thread Starter
SPYDERYJ
Registered User
1987 YJ Wrangler 
 
Join Date: Sep 2013
Location: Waianae
Posts: 33
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.

1987 YJ with 6" shackle lift on 33x12.50R15's.
SPYDERYJ is offline  
post #6 of Old 09-08-2013, 09:43 PM
jokerchief462
Registered User
1989 YJ Wrangler 
 
Join Date: Nov 2010
Location: Sin City
Posts: 2,881
Oh yes priorities!!! Congrats!!!

Sent from underneath my Jeep

89YJ 2.5L TBI, AX-5, NP231 SYE, Ford 8.8, Yukon Grizzly, Tom Woods Shaft, 33" BFG T/As, 4" lift, Warn VR10000s.

AF Jeep Club Tail #184
jokerchief462 is offline  
post #7 of Old 09-08-2013, 09:44 PM Thread Starter
SPYDERYJ
Registered User
1987 YJ Wrangler 
 
Join Date: Sep 2013
Location: Waianae
Posts: 33
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.

1987 YJ with 6" shackle lift on 33x12.50R15's.
SPYDERYJ is offline  
post #8 of Old 09-08-2013, 09:45 PM
Gage56
Registered User
1992 YJ Wrangler 
 
Join Date: Feb 2013
Location: Northumberland
Posts: 1,598
Id say the alt mine has all ways had a hi pitch whine

1992 YJ
Gage56 is offline  
post #9 of Old 09-08-2013, 09:46 PM Thread Starter
SPYDERYJ
Registered User
1987 YJ Wrangler 
 
Join Date: Sep 2013
Location: Waianae
Posts: 33
I'll have to check that out as well.

1987 YJ with 6" shackle lift on 33x12.50R15's.
SPYDERYJ is offline  
post #10 of Old 09-08-2013, 11:43 PM
jred
Registered User
1994 YJ Wrangler 
 
Join Date: Apr 2013
Location: Memphis
Posts: 338
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.
jred is offline  
post #11 of Old 09-09-2013, 04:00 AM
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit
Posts: 20,783
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.
Que89YJ is offline  
post #12 of Old 09-09-2013, 05:40 AM
WDNewman
Registered User
1989 YJ Wrangler 
 
Join Date: Jun 2013
Location: Central Mississippi
Posts: 1,359
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.
WDNewman is offline  
post #13 of Old 09-09-2013, 08:12 PM Thread Starter
SPYDERYJ
Registered User
1987 YJ Wrangler 
 
Join Date: Sep 2013
Location: Waianae
Posts: 33
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.

1987 YJ with 6" shackle lift on 33x12.50R15's.
SPYDERYJ is offline  
post #14 of Old 09-10-2013, 09:44 PM
Gage56
Registered User
1992 YJ Wrangler 
 
Join Date: Feb 2013
Location: Northumberland
Posts: 1,598
here is what my noise sounds like and i know its the alt

[ame]http://www.youtube.com/watch?v=1FVKNX4QkHM&feature=c4-overview&list=UUISXYgHTlYeOJnNkuqYmMjA[/ame]

1992 YJ
Gage56 is offline  
post #15 of Old 09-10-2013, 10:16 PM Thread Starter
SPYDERYJ
Registered User
1987 YJ Wrangler 
 
Join Date: Sep 2013
Location: Waianae
Posts: 33
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.

1987 YJ with 6" shackle lift on 33x12.50R15's.
SPYDERYJ is offline  
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may not post new threads
You may not 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 On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome