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Old 02-13-2014, 10:40 PM   #1
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1994 Wrangler making high pitch whining sound

Hi, there everybody. I was hoping someone would have some good ideas of what is going.
So I have a 94 wrangler S 5 speed trans and the 2.5 4 cyl engine, and just the other day it started squealing real loud. It was after I had to engage the 4x4 for for 20 minutes or so.

I used the 4 hi range and after disengaging the 4x4 it started it to happen only when driving and NOT when the clutch pedal is engaged. It happens at low and high RPM's, and in 1st all the way to 5th gear

I was thinking it maybe in the front drive shaft, but IDK. It seemed to get better for a couple of minutes when I engaged the 4x4 again and then disengaged it.

Any ideas would be greatly appreciated. And please let me know if more info is needed.

Thanks

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Old 02-13-2014, 10:53 PM   #2
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Does the tone of the squeal change with the RPM's?

Does it only do it in 4wd?

Can you locate the source better, such as motor or drivetrain?

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Old 02-14-2014, 03:32 PM   #3
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No it only does it in 2 wheel drive it seems.
When you increase the RPM's it seems to get a little louder. It is a weird shrill sound. It seems to be the front of the jeep around the middle of the engine compartment. It's hard to tell because it only does it when in gear and moving down the road. One other weird thing is that, it will be quieter at around 2000 RPM's and gets louder if you drop below or go above 2000 RPM's. But after a while of driving it will make the noise all the time. And when you press the clutch pedal all the way in it will be completely silent, until you let the clutch out again. The engine sounds fantastic when the clutch is in. It only has 129,000 miles on it. And the guy that had it previously took really good care of it.

It just started last week, I went out caving and to get out there I had to engage the 4 hi, but I still got a little hung up in the snow. So I had to rock it back and forth between 1st gear and reverse. I don't feel like I was to hard on it though. I pulled out when I was done in the cave and drove the 1/2 mile down the drive way and then shifted out of the 4x4. And that's when it started making the noise.

I have been a manual kind of guy for the last 10 years and I have never heard a throw out bearing make that noise. Granted I drive Honda's most of the time but this is my second jeep.

I hope it's not the throw out bearing, It still shifts great!

Thanks for taking the time

Owen
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Old 02-14-2014, 03:37 PM   #4
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I have a 95 YJ 2.5 had the same thing happen to me, when I engaged the clutch it went away when I let out it squealed, it was my belt it was loose, tightened up and it no longer squeals good luck!
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Old 02-14-2014, 03:49 PM   #5
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High-pitched whining?

Hmmm...did you take it out to dinner?

Because it may think it's your girlfriend now.
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Old 02-14-2014, 05:41 PM   #6
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I have the same problem on my 91 YJ 2.5l sometimes, I'm pretty sure it's the idler pulley on mine, it wiggles side to side ever so slightly when I stop the engine and push on/fiddle with it. When I start the engine again, the squealing stops. When it starts squealing again, it's loose again. It squeals in exactly the same RPM range (2000 and below and gets quieter above 2000) and behaves in the same way you are describing. Every other pulley is firm and rotates evenly without wiggling side to side. Does your YJ have AC? If not, check the idler pulley for side to side play.

Like you said, it could be the throw out bearing which explains the sound when engaging and disengaging the clutch. Does it seem like the sound is coming from below you more than in front?
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Old 02-14-2014, 08:01 PM   #7
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Thanks guys. I take a look at it and see if that's the case, once this snow stops.

I'll let you all know

Thanks
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Old 02-15-2014, 09:16 PM   #8
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I think that may have nailed it. I still need to go back out in the morning and tighten the belt, but the noise seems to be in that area. The top pulley was a little loose. tightened that, but after driving the belt seemed kind of loose. But it was dark and snowing so I'm gonna get out there in the daylight.

Thanks, I'll let you all know what's up
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Old 02-16-2014, 09:48 AM   #9
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I replaced my idler pulley, alternator pulley, and belt still squealed then I tightened the heck out of it and it hasn't done it since
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Old 02-16-2014, 07:05 PM   #10
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Thanks everyone! Changed the idler pulley and that got it.

Only 17 bucks too, and 5 minutes of my time.

Thanks

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