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cold engine squeal!!

Old Oct 4, 2007 | 04:50 PM
  #1  
Brennan's Avatar
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From: Corner Brook, NL
Car: 1984 Z28 HT,2006 2500HD
Engine: 5.7L, 6.6Llbz dmax
Transmission: 700R4, 6 speed allison
Axle/Gears: worn out 3.73 posi
cold engine squeal!!

when i start my car in the mornings or whenever its cold i get a reallllly loud and annoying squeal that sounds like a bad belt but its not i have two brand new belts on it and that never fixed it so is there anywhere i should check or has anyone had/fixed this problem?
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Old Oct 4, 2007 | 05:32 PM
  #2  
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Take one belt off, start it up; if the squeal goes away, that was the belt and/or component that was causing it. If the squeal is still there, take the next belt off, start it up, etc.
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Old Oct 5, 2007 | 08:04 AM
  #3  
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From: Corner Brook, NL
Car: 1984 Z28 HT,2006 2500HD
Engine: 5.7L, 6.6Llbz dmax
Transmission: 700R4, 6 speed allison
Axle/Gears: worn out 3.73 posi
Re: cold engine squeal!!

thanks i suspect the power steering pump but we`ll see
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Old Oct 5, 2007 | 08:13 AM
  #4  
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From: Bertram (outside Austin), TX
Car: 87 GTA
Engine: L98
Transmission: 700R4
Axle/Gears: Dana M78 3.27 posi
Re: cold engine squeal!!

New belts, but are they tight? If they are too loose, they'll squeal, even brand new.

If the squealing stops after everything warms up, I bet heat expansion is tightening them, and making the rubber of the offending belt, have tighter grip.
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Old Oct 5, 2007 | 08:32 AM
  #5  
Brennan's Avatar
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Joined: Jul 2007
Posts: 1,305
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From: Corner Brook, NL
Car: 1984 Z28 HT,2006 2500HD
Engine: 5.7L, 6.6Llbz dmax
Transmission: 700R4, 6 speed allison
Axle/Gears: worn out 3.73 posi
Re: cold engine squeal!!

come to think of it that may be the problem because when my belts are off the alt. is a beeatch to turn by hand, ill check later and the belts are as tight as i could get them when they were new maybe theyll tighten more now that theyve been in use for a few days thanks for the help guys
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Old Oct 5, 2007 | 09:06 AM
  #6  
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From: Fort Lauderdale
Car: 1991 Pontiac Trans Am
Engine: 305
Transmission: 700r4
Re: cold engine squeal!!

If you can't turn the alternator pulley without a lot of effort, replace the alternator before it causes problems. I've not had much luck with rebuilt units so I just replaced a rebuilt unit with a sticky pulley with a new duralast gold one from Autozone. Gonna try and see if a new unit works out better than a 3rd rebuilt one.

All your pulleys should move relatively freely. Well, except the crankshaft pulley. If that moved freely you'd have a dead car on your hands...

The alternator pulley I just replaced was showing signs of dying other than the pulley being sticky/having a light scraping sound when turning it by hand. It was outputing a lil bit under specs unlike when it was "new". The new unit now keeps the gauge where it should be.

Also, if you have a smog/air pump, those pulleys tend to go too. My last one was making a godawful racket, but still worked. Once I replaced it... again... The engine bay was worlds quieter. I've found the noisest and least reliable pulleys/units on my car to be the alternator and the smog pump. On two different 1991 TAs I've replaced the alternator 5-6 times. The 1st time under the original factory warranty with maybe 25,000 miles on the car. The rebuilt smog pumps are a crap shoot. Original lasted 15 years, and I'm on my 3rd rebuilt unit in 3 years now. Easy to replace at least.
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Old Oct 5, 2007 | 09:50 AM
  #7  
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From: North Central Mass.
Car: 1985 Berlinetta
Engine: Megasquirted TPI
Transmission: Transgo 700R4
Axle/Gears: 3.42
Re: cold engine squeal!!

you can rebuild an alternator yourself for about 30 dollars.
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Old Oct 5, 2007 | 10:55 PM
  #8  
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From: Edmonton, AB
Car: '87 Z-28
Engine: LT1-topped 400
Transmission: T56
Axle/Gears: 3.42
Re: cold engine squeal!!

mine did the same thing, if i had the lights on and the heater going there'd be too much draw on the alternator and the resistance would make the belt squeal until it was warm. now i just don't drive it when it's cold out :/
wasn't an option at the time tho.
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