I have a little video clip of the noise and will try to put it up on youtube with a link shortly.
Short story is got ready to leave for a long trip to the outer banks of NC two weekends ago, jumped in the cruiser and when i started it up, it sounded like the PS pump was whining. Checked the fluid and it was fine, so i decided to just go. Noise went away and never heard it again for the entire 4 day trip. Several times while we were camped on the beach i started the truck to charge the battery and never heard the whine noise.
Left the beach and started home, no noise. About halfway home i stopped for gas and when i pulled into the gas station i heard it again, pretty loud. I immediately thought i had a leak and was low on PS fluid, so i ran to the auto zone which was next door and purchased a bottle of ATF fluid.... opened the reservoir and it was full! No bubbles or froth.
Over the holiday i replaced the PS pump thinking that was the cause. I had a brand new one sitting on the shelf so i put it in. Absolutely no change in noise. WTF!!

So then i thought maybe it's the AC or the AC idler pulley, so i removed the belt from the AC and spun the AC pulley and the idle pulley by hand and they were smooth as silk. WTF!
Next i thought, maybe the nose cone on the supercharger is going bad for some reason and maybe one of the supercharger pulleys has a bad bearing.... so i pulled the SC belt off and spun everything. Everything was smooth as silk!
So now i'm confused. WTH is causing this noise?!! When i rebuilt my motor i put in a new water pump... so the water pump probably has 15,000 miles on it. The only thing i didn't pull was the alternator, but i did spray some penetrating lube on the pulley to see if it would quiet down and it didn't.
The whine increases and decreases with throttle. So either it's belt or crank driven and i'm low on options. To me, it sounds just like a noisy PS pump.

Short story is got ready to leave for a long trip to the outer banks of NC two weekends ago, jumped in the cruiser and when i started it up, it sounded like the PS pump was whining. Checked the fluid and it was fine, so i decided to just go. Noise went away and never heard it again for the entire 4 day trip. Several times while we were camped on the beach i started the truck to charge the battery and never heard the whine noise.
Left the beach and started home, no noise. About halfway home i stopped for gas and when i pulled into the gas station i heard it again, pretty loud. I immediately thought i had a leak and was low on PS fluid, so i ran to the auto zone which was next door and purchased a bottle of ATF fluid.... opened the reservoir and it was full! No bubbles or froth.
Over the holiday i replaced the PS pump thinking that was the cause. I had a brand new one sitting on the shelf so i put it in. Absolutely no change in noise. WTF!!


So then i thought maybe it's the AC or the AC idler pulley, so i removed the belt from the AC and spun the AC pulley and the idle pulley by hand and they were smooth as silk. WTF!

Next i thought, maybe the nose cone on the supercharger is going bad for some reason and maybe one of the supercharger pulleys has a bad bearing.... so i pulled the SC belt off and spun everything. Everything was smooth as silk!
So now i'm confused. WTH is causing this noise?!! When i rebuilt my motor i put in a new water pump... so the water pump probably has 15,000 miles on it. The only thing i didn't pull was the alternator, but i did spray some penetrating lube on the pulley to see if it would quiet down and it didn't.
The whine increases and decreases with throttle. So either it's belt or crank driven and i'm low on options. To me, it sounds just like a noisy PS pump.
