Front-end accessory drive squeak/squeal...
#1
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This is driving me crazy.
It's a repetitive squeak-slash-squealing sound seeming to originate from under the hood, near the front of the engine. IMO, it's a bearing going bad.
If I don't figure it out, I'm going to beat something sturdy with something heavy just to get some frustration out.![Bang Head](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_banghead.gif)
It's louder when the car starts and lessens as it warms up. It's RPM-dependent. If I rev the engine, accelerate or add load to the motor, it accelerates with the motor. It decelerates similarly. If I click on the AC, it changes pitch and slows a bit in response to the new load.
This squeak problem started a few months ago. I took the car off the road for a while, because so much stuff needed repairs.
The headers came out and got re-coated.
As I was getting the headers out, I found the AC compressor seal had let loose. Refrigerant mixed with dirt was caked everywhere. So it got a completely overhauled AC system including a brand-new compressor, and a new pair of idler pullies while I was down there. AC system is all-new.
The diodes in the alternator were going bye-bye, and it had a bad front bearing. So it's got a new alternator.
While the car was down, I changed out the water pump. The original had gone 70k and the system needed a flush anyway. With all the accy's out of the way, this was a good time to do the job. So. it got a new water pump too.
For s-n-g's, I put a new main drive belt idler in. New AC and main drive belts were replaced too.
All parts were new, not remanufactured or anything like that. Brand new stuff from what I consider to be above-average parts distributors.
The only two (2) things I left untouched are the crank pulley (which is about a 10-years old ASP underdrive pulley) and the power steering pump.
I started it up today after completing all that work and the squeak was gone - I assumed with all that new stuff, I must have replaced whatever it was.
Until I drove the car off the ramps. As soon as I loaded up the engine, it made the noise again.
![Barf](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_barf.gif)
The one time I need my wife's camera and it's not working. If I can get it to work, I'll make a video of the noise.
I tried searching but didn't come up with much. Any insights? Thanks,
-Roger
It's a repetitive squeak-slash-squealing sound seeming to originate from under the hood, near the front of the engine. IMO, it's a bearing going bad.
If I don't figure it out, I'm going to beat something sturdy with something heavy just to get some frustration out.
![Bang Head](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_banghead.gif)
It's louder when the car starts and lessens as it warms up. It's RPM-dependent. If I rev the engine, accelerate or add load to the motor, it accelerates with the motor. It decelerates similarly. If I click on the AC, it changes pitch and slows a bit in response to the new load.
This squeak problem started a few months ago. I took the car off the road for a while, because so much stuff needed repairs.
The headers came out and got re-coated.
As I was getting the headers out, I found the AC compressor seal had let loose. Refrigerant mixed with dirt was caked everywhere. So it got a completely overhauled AC system including a brand-new compressor, and a new pair of idler pullies while I was down there. AC system is all-new.
The diodes in the alternator were going bye-bye, and it had a bad front bearing. So it's got a new alternator.
While the car was down, I changed out the water pump. The original had gone 70k and the system needed a flush anyway. With all the accy's out of the way, this was a good time to do the job. So. it got a new water pump too.
For s-n-g's, I put a new main drive belt idler in. New AC and main drive belts were replaced too.
All parts were new, not remanufactured or anything like that. Brand new stuff from what I consider to be above-average parts distributors.
The only two (2) things I left untouched are the crank pulley (which is about a 10-years old ASP underdrive pulley) and the power steering pump.
I started it up today after completing all that work and the squeak was gone - I assumed with all that new stuff, I must have replaced whatever it was.
Until I drove the car off the ramps. As soon as I loaded up the engine, it made the noise again.
![Barf](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_barf.gif)
The one time I need my wife's camera and it's not working. If I can get it to work, I'll make a video of the noise.
I tried searching but didn't come up with much. Any insights? Thanks,
-Roger
#3
On The Tree
Join Date: Apr 2011
Location: St. Louis Missouri
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Also sounds similar to my problem, although mine goes away after warming up. Very odd considering that you have replaced all of those acc's with brand new parts. I am going to try spraying some wd-40 on each of the pulleys one at a time to try narrowing down the problem.
#4
11 Second Club
Thread Starter
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My power steering cooler has died. The power steering fluid is an odd reddish color (no, it's not ATF) indicating it mixed with Dex-cool. I wonder if the noise is coming from the PS pump because the fluid is contaminated?
I ordered a fluid cooler to install in place of the stock PS cooler. It should be here Thursday. I'll delete the factory cooler and go with the one-piece radiator hose. Then I'll flush and bleed the power steering system and hope for the best.
We shall see. I'll let ya know...
I ordered a fluid cooler to install in place of the stock PS cooler. It should be here Thursday. I'll delete the factory cooler and go with the one-piece radiator hose. Then I'll flush and bleed the power steering system and hope for the best.
We shall see. I'll let ya know...