My car runs fine and doesnt have any problems, however in between shifts at wide open throttle something under the hood is squealing. It sounds exactly like a slipping belt, but it only does it in between shifts. The car pulls fine and doesnt lose any power at all, any ideas what could be making this noise? Its just embarrassing more than anything, and I would like to fix it.

edit: CAR IS AN AUTO!!!!

 

Have you checked the serpentine belt? Its known to produce that sort of problem when its worn.

 

Yup, when I tired figuring out this problem a long time ago we replaced the belt and it continued to make the noise. I am wondering if its the tensioner or one of the pulleys bending.

 

Is the tensioner "indicator" in the proper position, showing that the belt tension is correct?

 

Don't see much in the front of the engine changing when the back half of the engine is loaded or not. However, I would expect something up front to squeal when it's loaded or unloaded. Like loading the alternator with a lot of electrical load (lights and defroster). So the question is does changing the front loads change anything at either WOT or at a lesser speed?

In my mind you likely have a throw out bearing issue or more likely, a pilot bearing issue. But then we don't have a lot of information to go by either.

 

Its squealing when he shifts. When the engine shifts to the next gear, the RPM drops suddenly. The inertia of the mass moving on the front of the engine can cause the belt to momentarily continue to move faster than the slowed down crank pulley, and "skid" to a lower RPM.

 

This is what I am thinking the problem is. I am going to take my video camera with me to work and see if I can capture the sound.

 

my stuff started squealing when my trans began to go bad

 

I have also heard that the quality of the replacment belt can have something to do with this phenomenom. I have heard the Goodyear Gatorback belts were the best. FWIW, a squealing belt on a full throttle shift wouldn't concern me too much. Just an annoyance.

 

I have to second the transmission diagnosis. It sounds like a bad PWM solenoid and it is probably doing it at the attempt to lock up the TCC switch. Eventually it will override and lockup but often it will produce a shriel or squeal before it goes out completely. Sounds EXCACTLY like a belt.

 

I dont think a 93 or 94 has a PWM solenoid. That was in the 95's and later.

 

Can anyone else verify this?

 

First let me say to those who previously posted that realized this guy had an automatic, my hats off to you. I had to go deep into his cardomain pictures to find an interior photo to see what kind of tranny he had. It's a crying shame we have dig for information just to answer a question.

One would assume from him talking about shifting, that he had a manual. Especially since he never mentioned it in any posts. Much less his cardomain page.

To the point of the tranny parts. The 93 had a bastard tranny. You should see an RPO in the glove box of MD8. This is the non electric version of the 4l60. Other wise known as the 700R4. The following years were given the 4l60E. Assuming the tranny wasn't changed, it would be a good idea for you to check the glove box.

Stop focusing on the back side as I suggested in the post where I assumed you had a manual tranny and do as Fred suggested up front.

 

This was my thoughts at first, changing a throw out bearing is not exactly easy however.

EDIT: Turns out he has an auto.

 

Yeah sorry guys its an auto, I thought i had that in my sig (I updated it).

Its not causing any problems other than the fact that its annoying. I tried getting a video with no luck, I'll try again today.