Squealing sound when accelerating

[Kline224]

Edit: It's a 2004 4.0 automatic

I've got a loud squealing sound that just started today when accelerating, I did some research but I'm not really sure on the culprit. Many posts said drive shaft if it doesn't make the sound when in neutral, but my Jeep definitely does. If the revs are up past idle, it squeals, parked or not.

Fluids all look okay, but I'm going to recheck in the morning since I checked when the engine was still hot when I got home after hearing it. I know I could use an oil change, though.

I was thinking maybe it's the OPDA issue? I'm not entirely sure but I'll upload an audio clip in the morning as soon as I get the chance and I'll reply back here with it.

Any thoughts or ideas of what to look for?

Hopefully sometime soon I won't be posting these "I've got a problem" threads and be able to post pictures of the finished/fixed Jeep!

 

[AndyG]

Belt, tensioner, pulley are all possibilities also.

Reminds me of a case in a Wal Mart here in Alabama....true story too..guy molested a pig in the bathroom. I figure he wouldn't have got caught, but the pig squealed on him.

 

[Tom Hendrix]

My 05 LJ just started this also. Sounded like screaming monkeys. I am going to look at the idler pulley but I already have an ODPA so I am going to change it just in case.

 

[John Wolf]

Check for vacuum leaks, they cause squealing many times

 

[Bas-NL]

most change it is pulley, belt related..

 

[InOmaha]

Check everything belt related. Belt, tensioner, and pulleys. Replacing a belt might stop the noise, but if a pump is going out, it won't solve the underlying problem.

 

[Vinman]

Were your tires spinning?

 

[Sancho]

Probably not OPDA... but it is worth visually inspecting. Most OPDA sounds go away within a minute.

As others have said.. probably belt related. I am assumung that it squealed in neutrel and stationary?

If moving.. could be ujoints to wheel hubs.

Imo

 

[Kline224]

Happeed while moving and neutral/stationary. This mornining I went out to poke and prod at it/get a recording.

I started it up and lightly revved it, threw the belt - looks like the harmonic balancer is bad. It's walked off toward the fan a good ways and caused it to throw the belt off. Just picked up a new harmonic balancer and new belt, the old one is the original I'm pretty sure.

I'll update back here once I get everything swapped out

 

[ItchyDong]

That's either the VTEC, or your Squealing Accelerator Actuator kicking in. Nothing to worry about.

 

[Kline224]

Very very late reply but it was the harmonic balancer like I posted before. I got halfway through replacing it and realized I didn't have all the right tools to get it done properly so I took it to a local shop. In and out for $100

I ended up going out to start up the Jeep with the hood up to check it out, right after I started it up the belt flew off. Got underneath it and the outer ring of the balancer was barely hanging on. Fixed up and got an oil change, running perfectly now!

Also for anyone trying to find the bolt size, it's 1/2-20-1.25. I lost mine somehow and had to get a new one, someone in a different thread confirmed the size for me.

 

[Xcelr8z28]

Spray some belt conditioner on the belt when its running if the noise goes right away its pulley/belt related.

 

[Rocky05]

i have a weird squealing from my transmission and not sure what it is 05 wrangler 4.0 with 42rle all fluids are good and squeals 90% of the time. Help?

 

[twistedlv]

i have a weird squealing from my transmission and not sure what it is 05 wrangler 4.0 with 42rle all fluids are good and squeals 90% of the time. Help?

How many miles are on it? Could be the pump going bad. Mine goes in Monday for a trans swap for that very reason. It has 151K.

 

[Rocky05]

its got 147,000 some odd miles on it and yea i figured it was would the tcm be affected as well?

 

[twistedlv]

its got 147,000 some odd miles on it and yea i figured it was would the tcm be affected as well?

I gambled on a @Wranglerfix enhanced PCM because it is a well documented problem child on 05-06's. When doing a powerbrake torture test with the oem unit, I got the tranny to throw a bunch of TCM codes and slip badly.
With the few miles I have on the Warnglerfix, I did notice better idle and throttle response, but the noise quickly returned even with no codes.
I think a bad TCM can damage a trans, but I don't think the opposite is true.

 

[Rocky05]

I gambled on a @Wranglerfix enhanced PCM because it is a well documented problem child on 05-06's. When doing a powerbrake torture test with the oem unit, I got the tranny to throw a bunch of TCM codes and slip badly.
With the few miles I have on the Warnglerfix, I did notice better idle and throttle response, but the noise quickly returned even with no codes.
I think a bad TCM can damage a trans, but I don't think the opposite is true

alright thank you im just going to pull the trans and rebuild it