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Northstar Engines and System Technical Discussion Discussion, Developed an engine whine... what is it? in Cadillac Engine Technical Discussion; Most of these cars disable the starter circuit when the engine is running - so you CAN'T get that awful ...
  1. #16
    Submariner409's Avatar
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    Re: Developed an engine whine... what is it?

    Most of these cars disable the starter circuit when the engine is running - so you CAN'T get that awful noise.

  2. #17
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    Re: Developed an engine whine... what is it?

    98 Deville should still grind the starter when you attempt to start the car when it's already running. Not that I suggest doing it though.

  3. #18
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    Re: Developed an engine whine... what is it?

    I though Cadillac (maybe GM) "idiot proofed" them all long ago,

  4. #19
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    If i have mine started with remote start it will not allow me to start the car again. I do believe anti grind was introduced by the mid 90s for a lot of gm vehicles. Now my 99 PA would grind... That sounds haunts me still.

  5. #20
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    Re: Developed an engine whine... what is it?

    My aunt did in my 99.

  6. #21
    wingman0121 is offline Cadillac Owners Member
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    Re: Developed an engine whine... what is it?

    Quote Originally Posted by Ranger View Post
    I though Cadillac (maybe GM) "idiot proofed" them all long ago,

    Not on my car because I did it once a few years ago.


    The whining noise is not from the starter, so I can only assume it is something inside the engine.

  7. #22
    Submariner409's Avatar
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    Re: Developed an engine whine... what is it?

    Has anyone mentioned the timing chain tensioners (3) and guide slippers (3). Those nylon-faced parts wear out over time and the chains can rub on the metal parts, causing a distinctive whine that varies with rpm.

    Remove the oil fill cap and listen. Posts 4 and 6.

  8. #23
    rodnok01's Avatar
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    Could be chain whine, that main tensioner on mine was about wore slap out at 100 k and metal on metal would definitely cause a whine.

  9. #24
    wingman0121 is offline Cadillac Owners Member
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    Re: Developed an engine whine... what is it?

    I listened with the oil cap removed and the whine sounds a little bit louder. If it is the chain rubbing on the guide slippers/tensioners then does that mean it is going to break something soon?

  10. #25
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    Re: Developed an engine whine... what is it?

    Metal-to-metal rubbing is never good.............. but if it IS one or more worn tensioner guides the fix is quite involved.

    The nylon tensioner faces are hard to see (the tensioners are secured by 2 bolts each and are set by engine oil pressure) , but the blue-green one is typical. The brown slippers get replaced, too. It CAN be done with the car up in the air, wheel removed, inner fenderwell liner out, flexplate locked, lots of wrenching and testing. New tensioners - all 3 are not too expensive. Same for the larger guide slippers.
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    wingman0121 is offline Cadillac Owners Member
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    Re: Developed an engine whine... what is it?

    I took a video of my said noise, ignore the low rumble, that's from the aftermarket muffler.


  12. #27
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    Re: Developed an engine whine... what is it?

    I hate to be picky, but please do that again, 30 seconds' worth, with the hood open and an assistant on the gas pedal. "Listen" to the loudest area.

  13. #28
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    Re: Developed an engine whine... what is it?

    That almost sounds too much like my last failed transmission. It failed 7 days after making this noise. Take off the serpentine belt and start the engine to eliminate the possibility of it being the accessories.


  14. #29
    wingman0121 is offline Cadillac Owners Member
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    Re: Developed an engine whine... what is it?

    That does sound just like the whine on my car, did your transmission do anything weird before it gave away? Did the noise stopped after you replaced the transmission? I've already taken off the accessory belt before and the noise persisted so it isn't anything around those components.

  15. #30
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    Re: Developed an engine whine... what is it?

    The noise seemed to be from the trans fluid pump (straight cut gear sound - reverse gears in manual trans vehicles). It is driven by the engine so the speed varies accordingly with the engine RPM.

    The transmission developed some hesitation in day 3, followed by the fluid exchange I did (I found LOTS of metal particle and clutch material on the magnets and the screen). Suddenly it just threw "Service Transmission" P1811 - Maximum adapt and Long shift, but the trans acted like nothing happened. No hesitations but the noise was there. Day 5 it threw P0741 but without SES light. It worked okay until the day 7, it started pumping fluid out of its case through the case vent. Then after a while I lost 4th, 3rd, and 1st. At this point I knew the trans was done, so I just drove it home in 2nd with the fluid "overflowing" to the ground. The trans was acting weird though, I lost gear shift indicator once, and it slipped in all gears once. All came back when I just waited about 5 minutes or so.

    I opened the broken one up, and found the torque converter to be the problem. During the previous ownership, the owner went with some el cheapo reman. torque converter and the viscous clutch inside had failed. The viscous clutch fluid went everywhere into the transmission.

    I replaced the transmission with a used one and the noise went away. After a year the used transmission has developed the infamous axle seal leak though. What a lucky guy I am.

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