4.9 groaning
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HT4100 4.1, 4.5, 4.9 Discussion, 4.9 groaning in Cadillac Engine Technical Discussion; My '93 CDV with 70k miles has a loud groan that I'm not quite sure what it's coming from. I ...
  1. #1
    caddydaddy's Avatar
    caddydaddy is offline Cadillac Owners Connoisseur
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    4.9 groaning

    My '93 CDV with 70k miles has a loud groan that I'm not quite sure what it's coming from. I thought it was the PS pump, since my '94 Deville had made a similar sound before I changed it's PS pump. But I changed the PS pump on the '93, and the groan remains! I'm not sure if it's the water pump or the A/C compressor. Does the water pump make a groan when it's going bad? Any suggestions, before I go changing parts needlessly?

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    HUF's Avatar
    HUF
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    Re: 4.9 groaning

    Hub bearings make similar noise as well. Are you sure it is from motor?

  4. #3
    caddydaddy's Avatar
    caddydaddy is offline Cadillac Owners Connoisseur
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    Re: 4.9 groaning

    Quote Originally Posted by HUF View Post
    Hub bearings make similar noise as well. Are you sure it is from motor?
    Sorry, I should have mentioned, it's when the car is in park or drive. It's definitely the motor, just not sure what accessory.

  5. #4
    HUF's Avatar
    HUF
    HUF is offline Cadillac Owners Connoisseur
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    Re: 4.9 groaning

    You might want to remove the serp. belt, turn accessories by hand and carefully listen to the noise (if any ) they make. That's not an easy task if they make noise only at higher RPM though. I have had some groan for two years (not in park) and the pitch changes with rather RPM than speed. Still cannot locate the source.

  6. #5
    derrty_deville's Avatar
    derrty_deville is offline Cadillac Owners Enthusiast
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    Re: 4.9 groaning

    Quote Originally Posted by caddydaddy View Post
    Does the water pump make a groan when it's going bad?
    Yes it will.

  7. #6
    caddydaddy's Avatar
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    Re: 4.9 groaning

    Quote Originally Posted by derrty_deville View Post
    Yes it will.
    That's good to know! I tried what HUF suggested earlier with spinning the accessories by hand, but that's hard to do when parts like the PS pump and water pump don't move very fast by hand.
    My next plan was to try using the 62" serpentine belt that bypasses the A/C compressor, to confirm that it is the water pump and not the A/C compressor. But I am kinda thinking that it is the water pump that is making all the noise! It is quite noisy too, it's a loud growling, grinding noise. Sound familiar?

  8. #7
    Head Hog is offline Cadillac Owners Member
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    Re: 4.9 groaning

    I've got a 92 DeVille that I think makes the same noise that you're describing. It doesn't seem to affect the performance at all though. I came up with the same theories (a/c compressor, water pump etc). I even thought that it may be the tranny at first, but thank God I think I'm wrong about that one. At times I smell a slight burnt rubber smell under the hood, which really makes me think that it's one of the network of pullys that the 4.9 has.

    I'm interested in hearing what you come up with, and also am interested in any other ideas about this. the noise on mine seems to dissipate at higher speeds/RPMs, but it may just be that I can't hear it as well then because of other noise.

  9. #8
    JK2402 is offline Cadillac Owners Member
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    Re: 4.9 groaning

    My 91 Fleetwood had the same thing, turned out to be the A/C compressor. At first I thought it was my water pump as well. I removed the access plate from the passenger side wheel well and took of the belt. When I turned the A\C pulley by hand not only could I hear it, but I could also feel the roughness.

  10. #9
    I~LUV~Caddys8792's Avatar
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    Re: 4.9 groaning

    My '92 deVille made a groaning/whining sound like that last winter...I had a hell of a time trying to find what it was, but it turns out it was a bad bearing in the Alternator...a $40 rebuild fixed that!
    "They call Alabama the Crimson Tide, call me Deacon Blues."

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  11. #10
    kdcing is offline Cadillac Owners Fanatic
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    Re: 4.9 groaning

    My '93 Eldorado w/ the 4.9L developed a groan about 3 weeks ago. 2 weeks ago, I took the serpentine belt off and rotated all pullies by hand, however, none of them were obviously bad. This weekend, I took off the belt again and found the water pump had an obvious grind. After its replacement, the groan has disappeared.

    By the way, a reman water pump @ AutoZone was only about $27 and took about 3 hours to replace. Careful when torquing the bolts/nuts as you can see in my post from a few hours ago.

  12. #11
    Head Hog is offline Cadillac Owners Member
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    Re: 4.9 groaning

    All posts were very helpful. Mine appears to be either the bearings in the alternator or tensioner pulley.

  13. #12
    Head Hog is offline Cadillac Owners Member
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    Re: 4.9 groaning

    All posts very helpful. Mine appears to either be the bearings in the alternator or tensioner pulley.

  14. #13
    MitchMeister- is offline Cadillac Owners Member
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    Re: 4.9 groaning

    I've got the same thing in my 94... maybe i should check the water pump.. seems to run a bit hot also..

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