Sounds just like a belt. I can drive around light on throttle, even at high RPM and it won't squeal. Soon as I have any fun at all it squeals like a belt. It ONLY does it under load. I tried all different belt combos and tensions. Today, I took both belts off and it still squealed - was kind of surprised it was not a belt, it sounds just like it. Does not squeal when revving in neutral. Has done it since new build for 1,300 miles. Runs incredible, nothing has changed or deteriorated. I thought it was coming from under hood, but possible it's from drivetrain? From front to back: - 455 Pontiac built by very reputable Pontiac builder - line deck bore honed torque plated, etc... - McCleod Pressure plate, clutch, and hydraulic T.O. Bearing. - TKO600 - Looong driveshaft had built super fat with big U-joints - Original 61 BOP rear end with Posi was also built by reputable shop I've had the driveshaft out once since built, and cautious not to overtighten U joint. Sound did not change before and after it was out. Could be joint, but would think something would have changed when out. So I'm really hoping not in the motor. Suggestions on what to check or how to check? Thanks for any help.
Here is a short video of squeal... at around 3k RPM it is easy to just stab pedal for short squeals, but video is a bit tough to hear - it's much easier to hear in car. http://www.youtube.com/watch?v=T_t8tdY5T4E
1) Why is you steering wheel bobbing up and down? 2) How does it idle? could there be a vacuum leak and the gasket is squeeking like a kid blowing on a smarties box?
1) was holding phone in my hand. when i uploaded to youtube, it said it thinks my video is shaky and offered to fix it - i clicked okay - now it's a weird effect haha. 2) idles great. tune seems nuts on. actually though - you might be on to something here. it's a throttle body with IAC. it's possible it's ****ing air through the IAC. maybe tomorrow i'll plug it and see what happens.
My wife called and the Jeep was making a squealing noise. I went and took a look under the hood and found the crankshaft balancer had come loose from the pulley. Fixed it by replacing the whole ***embly.
Trans Pilot bearing Speedometer cable. Now a LOOOOONG extra thick drive shaft isn't really good. It hangs on the out put and u joints. Why no carrier bearing.
Didn't notice that noise yesterday when I drove it...it's hard to tell from the video but it does sound more like an air leak than a squeak to me. It's the stock length - 1961 Bonnevilles are just long cars. No center bearing either, that's the way they were.
- taped IAC shut, still squeals - can't be pilot bearing, it squeals when trans main shaft is engaged - speedo cable? i'd categorize as plausible not probable. easy enough to try, i'll try it in morn - balancer i put on was not a cheapy, but my toothed trigger wheel is adapted to it and could be causing problems. not sure an easy way to check this. will think about it. - throwout bearing spacing or pressure plate fingers? why only accelerating? how to check these? - yeah, huge driveshafts aren't great but that's how it goes with this car and the bigger diameter can fit the better. i'm really suspecting the u-joints. although, pinion angles were carefully planned and they are not big angles. - Trans? Same exact sound from any gear, but I suppose could be something in there. Input shaft? Any suggestions on honing in WHERE the sound is coming from? I had thought of maybe using a go-pro camera in different spots to see if squeal is louder in certain places but I don't own one of those. thanks for ideas. Stuart - I'm not sure if I had mentioned the squeal to you yesterday? I can't even recall if it did the squeal while you were driving it. At that point I was still ***uming it was a belt.
In your video the speedo needle is bouncing, that's a good clue the cable is not rotating smooth. Under load the pinion angles change some, loads on the tail shaft change. Gears in the trans can whine and in the diff too. I had a Harley stretch the head bolts, it would squeal squeal squeal about 10 - 12 times and stop when the head swelled from heat. A squeal like that from air would need to come from someplace that would gibe you problems greater just auditory. Such as performance, oil vapor mess... If it was vacuum related it shouldnt be loudest when vacuum is the lowest, under load with your foot in it.
I had a very similar squeal in my OT Holden. No matter how much tension in the belts it still squealed, turned out it was the alternator.....
good point! now very interested to try it. will report back tomorrow. yeah, i thought about that, but the reason IAC was bugging me is that it is an air leak that changes size based on computer control, and even if not a lot of vacuum, it's a bunch of airflow. anyhow - squeal sounds mechanical like a bearing, not so much like a whistle. but why only when accelerating? coolish or hot.
The trow out brg being too close to the PP fingers and is turning!!! It WILL squeel in any gear! On and off not always just once in a while. Check release spring and distance from the PP!!! Joe n Mo.
it sounds like a vacuum issue in the vid.the air flowing through the throttle body at high speed can make that noise.are you running an air filter.driveshaft would be rotational noise.
My speedo cable squealed in my merc, couldn't figure it out till I stuck my head under the dash while somebody else was driving it.. it has to to be something that's spinning.
it's not the speedo cable :\ i'll have to remember to always add a mile to odometer it happens when torque is applied - either stabbing or sudden throttle changes. rolling into throttle doesn't do it. i don't notice that it depends on vacuum or air speed. running an ordinary 14" filter.
Is it a squeal? Because I can hear my 4 barrels over open headers and it made a sound similar to that. But who knows how accurate the sound on youtube is. I remember the first time I heard them I thought it was something in the trans.
I had a noise kinda like that in a 63 chev truck---it was the pvc hose collapsing and opening --this may be a long shot but an easy & cheap fix--check all vac. lines for soft spots
I had an OT truck that the U joint would squeal like that, but only in reverse. I jacked it up and test buy running the truck forward, then backwards on jack stand while a friend listened as he walked around hunting for the sound, sure nuff, U-Joint changed and it never did it again. Godspeed MrC.
What type of induction set up do you have ? Standard 14" air filter ? My 07 chevy truck did the same squeal at 3000 rpms on heavy throttle. Sounded just like your video and it was definitely intake air making the noise. I was pulling a heavy trailer up a grade when it down shifted and SQUEALING at 3000 rpm. I could play with it make it stop, start, louder, softer. Reproduced any time I wanted every time.
Iiiinteresting. I can do exactly same thing. I can put my foot in spot about 3k rpm that is juuuust short of the squeal, then bump through it. I am in control of it. Single plane intake with 4150 style throttle body and a 14" K&N filter 3" tall. I ran a tube through firewall, put a tiny microphone into my end of tube, and placed the tube in a few spots by motor, then recorded on my phone. Right next to belts by balancer cannot really hear it. Snaked it down by ******, can't really hear it. BUt, right behind the air intake manifold it screams. I was thinking maybe PCV valve and was going to try plug it. I have a paper filter I'll try. Or maybe a seal between TB and metal base of air filter? Right now, just sitting metal on metal. I hate this squeal. I will find you squeal. Oh, I will find you.
You'll find it at the throttle body I'm sure. Guy next to me has a 3.5" tube on a 3.8 and it sounds like cross between a locomotive and a jet. Just for ****s, put a full body sir cleaner body with s tube to fender and you'll hear no more squeal.
harumph. i pulled whole air cleaner ***embly off and still squealed right away. i guess i'll try pulling and plug vac line from booster and PCV. could be inside the distributor. i still have distributor in place (Pontiac in back) to use as an oil pump and cam sensor. I cut off 7 of the 8 orig reluctor lumps of the MSD sensor wheel so that the remaining tooth synchs motor. maybe out of balance? chevy guys can buy a distributor plug with sensor from a catalog, i improvised.
Its the air rushing into the TBody I believe. Removing your air cleaner should make it more audible. Changing to a full OEM type should quiet it down as far as your ear is concerned
I hate to say this but,,, Is the throttle body tight? I had a friend who had a cheevy motor in his Studebaker truck and it whistled real bad. The carb wasnt tight and the gasket acted like a blade-o-gr*** between your thumbs.
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