96 SLS knock
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Northstar Engines and System Technical Discussion Discussion, 96 SLS knock in Cadillac Engine Technical Discussion; I'm looking at a 96 and the owner says he got an oil change and a week later it started ...
  1. #1
    jdmae92 is offline Cadillac Owners Member
    Automobile(s): Cadillac
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    96 SLS knock

    I'm looking at a 96 and the owner says he got an oil change and a week later it started knocking. "It does have a motor knock, doesn't miss or skip a beat but the knock is loud enough to not drive. I got an oil change in it last week and after 1 week the car started to make that noise." Could it be from carbon buildup? Would it show up that fast if it was carbon?

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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
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    Re: 96 SLS knock

    Carbon build up aka "Cold Carbon Rap" will go away within 60 seconds or so after starting. If it is continuous, it is not likely CCR. I have had CCR show up overnight on my '97 Deville. Quieted down before I got out of the driveway. A dose of WOT keept it from returning for a long time.

  4. #3
    dp102288's Avatar
    dp102288 is offline Cadillac Owners Connoisseur
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    Re: 96 SLS knock

    ^^ Agree. After the engine is warm, carbon doesn't knock anymore. There was/is an Eldorado for sale near me with a knock, for cheap. I checked it out thinking it was carbon, but after driving for a few minutes, it didn't go away.

    I think a fellow member had a knocking sound. But his problem ended up throwing a rod in his engine!

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