98 SLS screeching noise from egen.
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Northstar Engines and System Technical Discussion Discussion, 98 SLS screeching noise from egen. in Cadillac Engine Technical Discussion; Hi all new hear Theres been a screeching noise coming from the front of the egen. It was just a ...
  1. #1
    MCH
    MCH is offline Cadillac Owners Member
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    98 SLS screeching noise from egen.

    Hi all new hear
    Theres been a screeching noise coming from the front
    of the egen.
    It was just a little noise at frist
    so i take it to the shop thay replace the belt tencher? didnt help

    IM thinking water pump what do ya think Thanks Mike H

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
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    Re: 98 SLS screeching noise from egen.

    There are TWO belts and tensioners in a 98 SLS: the water pump belt is in the "rear" (driver's side) of the engine, behind the water pump cover which is bolted to the coolant crossover. The pump is driven off the front intake cam by a small belt and tensioner. The main accessory drive is in the front (passenger side).

    If your noise is in the front (passenger side) of the engine, and replacing the main serpentine belt tensioner did not help, then there are 3 more possibilities: the idler pulley bearing, the alternator bearings, or the a/c compressor clutch bearings are going bad.

    If the noise is, in fact, coming from the water pump area, then there's a whole different procedure to remove and change that setup.

    MCH, Go up to the USER CP in the blue bar at the top of the page and enter your car, year, model in your personal data and profile. Then your login header shows that so we can see what we're trying to work on.......Welcome Aboard !!!!

  4. #3
    MCH
    MCH is offline Cadillac Owners Member
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    Thread Starter

    Re: 96 SLS screeching noise from egen.

    Sorry its a 96 not 98 Wifes car
    squealing New belt tensioner,and idler arm pully And alternator.
    So the water pump is on the driver side

    The pump is driven off the front intake cam by a small belt and tensioner
    The main accessory drive is in the front (passenger side).
    Could this be the noise it sounds like its cooming from the top front side
    96 SLS 104000 mi
    Thanks Mike H Livoina MI

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    Ranger's Avatar
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    Re: 98 SLS screeching noise from egen.

    "Top front side" of the motor is the passengers side. I would suspect the idler or tensioner pulley bearing. Release the tension on the tensioner with a 1/2" breaker bar. Put the drive lug in the square hole on the back side and use it as a lever. Then spin each pulley by hand and see if there is any looseness, roughness or noise. If they are OK, check the A/C compressor clutch down below.

  6. #5
    MCH
    MCH is offline Cadillac Owners Member
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    Thread Starter

    Re: 96 SLS screeching noise from egen.

    I put a new idler pulley on a mo ago.

    I put a new tensioner pulley on 3 weeks ago.

    Last night i put a new alternator on.

    Im going to see one more time if i can here where its coming from.

    And thanks Ranger ill pull off belt and see if its the power stering

    and check the A/C compressor clutch

    THIS THING IS DRIVING ME NUTS!!!!!

    Thanks Mike H

  7. #6
    [NortHStaR]'s Avatar
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    Re: 98 SLS screeching noise from egen.



    Have you checked the power steering pump??

  8. #7
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    Re: 98 SLS screeching noise from egen.

    I know this is going to sound stupid, because it sounds like a belt or bearing from what you describe, but check the backfire valve on the end of the intake manifold by the P/S pump. It can make a high pitched whistling that gets very annoying. Move it a bit with a screwdriver or other object to try to get it to seal. My '97 STS did this and I thought for a minute it was the alternator. Another thing that can make a whistling/high pitched sound is the EGR tubes (flex pipes) running to the throttle body and coolant crossover. If they aren't sealed properly they can emit a very annoying sound too.

    When you have it figured out let us know- we're curious!


    Need parts for your Northstar Engine? www.northstarperformance.com

    Jake Wiebe, developer of the SureGrip™ Cylinder Head Stud Kit

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