Squealing, Chirping sound - From what?
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Freshman User
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From: Lewisville, TX.
Squealing, Chirping sound - From what?
I recently bought a 93 EB. It’s a 351 w/ approx. 140K – I’m the second owner. I love this truck, but recently it’s developed an annoying squeak or chirping – squealing sound. It appears to be coming from the front of the vehicle. Initially, I though it was a belt, or perhaps an idler pulley – as that’s what it sounds like, but it only manifests itself with the vehicle in motion. You cannot duplicate it by simply accelerating the motor alone. It seems to be most noticeable at approx. 22 – 2500 RPM, while under power. Odd thing is that if you ease up on the accelerator, the “squeal” will stop until you start to apply power again. The truck exhibits no other symptoms of a problem. I did recently have the exhaust replaced and the brakes done. The Exhaust is good and tight – no rattles or issues there. Could it be that one or both of the front axle nuts were over-torqued when the rotors were replaced? I can’t say for certain that it started after this work. Any and all ideas are appreciated. Thanks in advance!
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Joined: Feb 2002
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From: Rochester
Originally Posted by Bagmanners
I recently bought a 93 EB. It’s a 351 w/ approx. 140K – I’m the second owner. I love this truck, but recently it’s developed an annoying squeak or chirping – squealing sound. It appears to be coming from the front of the vehicle. Initially, I though it was a belt, or perhaps an idler pulley – as that’s what it sounds like, but it only manifests itself with the vehicle in motion. You cannot duplicate it by simply accelerating the motor alone. It seems to be most noticeable at approx. 22 – 2500 RPM, while under power. Odd thing is that if you ease up on the accelerator, the “squeal” will stop until you start to apply power again. The truck exhibits no other symptoms of a problem. I did recently have the exhaust replaced and the brakes done. The Exhaust is good and tight – no rattles or issues there. Could it be that one or both of the front axle nuts were over-torqued when the rotors were replaced? I can’t say for certain that it started after this work. Any and all ideas are appreciated. Thanks in advance!
Lead Driver
Joined: Sep 2002
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From: Gateway to the West
In the same vein as cje's post, can you duplicate the problem with the truck idling and adding some drag to the power steering by turning the wheel? A dying PS pump or loose belt will not necessarily show up until some greater drag is placed on the engine or pulley system. Another way to check would be to chock the wheels, set the parking brake, and put the truck in gear while listening for the problem.
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Freshman User
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From: Lewisville, TX.
I’ve tried that. Even had my son turning the wheel while I listened under the hood (Truck stationary – of course). Although the power steering pump would wine pretty good, and may be not long for this world – there was never any squealing, chirping, etc. This was in Park. I’ll give your other suggestion a try. Any other thoughts?
Post Fiend
Joined: Mar 2003
Posts: 14,413
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From: Sarnia, Ontario, CANADA!
I may be WAY off base here but you have an Eddie Bauer Bronco. Chances are you have automatic hubs. Maybe they are messed up (not the first time it has ever happpened) 
and have somehow locked themselves. When a universal joint is on it's way out they have a tendancy to start to clunk or squeak a bit.
I would check them out and check for play. You never know!
-Matt
and have somehow locked themselves. When a universal joint is on it's way out they have a tendancy to start to clunk or squeak a bit. I would check them out and check for play. You never know!
-Matt
Lead Driver
Joined: Sep 2002
Posts: 9,182
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From: Gateway to the West
If you have exhausted the belt and pulley possibilities, then I would suggest taking a look at the front axle where the right-hand axle stub passes through the axle housing on its way to the passenger side front wheel. Normally this axle should not be spinning unless the truck is in 4WD but if you do have automatic hubs as Beast12 mentioned, they may not be fully disengaging. You are looking for signs of rubbing on the axle housing by the axle itself. Its been known to happen especially if you have a wheel bearing gone south or camber alignment issues. This can be caused by a host of possibly failed or failing components.
It would seem the biggest dilema at this point is locating the source of the noise.
It would seem the biggest dilema at this point is locating the source of the noise.
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Elder User
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From: NJ
my 91 had the same squeal you describe. believe it or not the fan cluch was bad and when i replaced it the squeal was gone.
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From: Lewisville, TX.
First – thanks to everyone who provided input. All were good ideas! I made it home a little early this evening, and still had about 45 minutes of daylight so I thought I’d take another good look underneath. When I got the universal joint at the output of the transfer case, I noticed one joint looked a little off. It was hard to get in a position to see it properly. I moved the truck slightly to rotate the shaft little by little so I could get a better look. Long story short – the u-joint is toast. You could see where one of the bearing caps had actually broken and was missing about a ¼ inch on one side. Just for grins, I shot it with a healthy dose of LPS lubricant, and took it for a drive. No more squeal. I’m ashamed to admit that I missed it the first time I looked, but still glad to have stumbled upon the problem. So thanks again to all. By the way, are there any big challenges facing me in the repair?
Post Fiend
Joined: Mar 2003
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From: Sarnia, Ontario, CANADA!
Woohoo! What did I win? It was weird that I just guessed that. I pulled it out of the dark!
If your front end it similar to the front end on my 87 F250 then it is not too bad of a job. You just have to take the front tire off and remove the hubs and wheel bearings. You will need a special tool to take the hubs apart though. Good luck!
-Matt
If your front end it similar to the front end on my 87 F250 then it is not too bad of a job. You just have to take the front tire off and remove the hubs and wheel bearings. You will need a special tool to take the hubs apart though. Good luck!
-Matt
Elder User
Joined: Feb 2002
Posts: 703
Likes: 1
From: Rochester
Originally Posted by Bagmanners
First – thanks to everyone who provided input. All were good ideas! I made it home a little early this evening, and still had about 45 minutes of daylight so I thought I’d take another good look underneath. When I got the universal joint at the output of the transfer case, I noticed one joint looked a little off. It was hard to get in a position to see it properly. I moved the truck slightly to rotate the shaft little by little so I could get a better look. Long story short – the u-joint is toast. You could see where one of the bearing caps had actually broken and was missing about a ¼ inch on one side. Just for grins, I shot it with a healthy dose of LPS lubricant, and took it for a drive. No more squeal. I’m ashamed to admit that I missed it the first time I looked, but still glad to have stumbled upon the problem. So thanks again to all. By the way, are there any big challenges facing me in the repair?
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