Unusual noises or am I crazy?
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Northstar Engines and System Technical Discussion Discussion, Unusual noises or am I crazy? in Cadillac Engine Technical Discussion; My 98 Deville has been acting up lately, I'm led to believe its a bad engine mount. As for codes ...
  1. #1
    starbond's Avatar
    starbond is offline Cadillac Owners Member
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    Unusual noises or am I crazy?

    My 98 Deville has been acting up lately, I'm led to believe its a bad engine mount. As for codes I get (P1571, C1277) both TCS related errors

    Im hearing what seems to be overly loud tapping? Is this a normal sound for the engine to make?

    here is the link to the video
    https://vimeo.com/46621373

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: Unusual noises or am I crazy?

    Is this noise with the engine cold or hot, and does it change as the engine warms up ? How many miles, what oil, filter, last oil change ?? Suddenly appear or slowly become more apparent. Same with engine cover removed ? What does the noise "do" with engine rpm increase ?

    ........... something just went wrong with your link.......... now it's back........

    Is there something hitting a cooling fan blade ? (long shot, I know..........)

  4. #3
    starbond's Avatar
    starbond is offline Cadillac Owners Member
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    Re: Unusual noises or am I crazy?

    Just saw this now, will do a proper analysis tomorrow to answer your queries. I can tell you it has 88,983 miles, unsure of oil brand (10w-30), oil changed 5-31-12.

    A side note, I did a WOT a few days ago, and i got up to 55mph, switched to gear 2, floored it to about 70, and let go of the gas. as it was coasting back down the car shook pretty heavily. is that normal?

  5. #4
    Ranger's Avatar
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    Re: Unusual noises or am I crazy?

    No. Deceleration should be smooth, just like any other decel.

  6. #5
    starbond's Avatar
    starbond is offline Cadillac Owners Member
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    Re: Unusual noises or am I crazy?

    Thats what I was afraid of. Any potential cause to the violent shaking?

  7. #6
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Unusual noises or am I crazy?

    Motor mount maybe?

  8. #7
    starbond's Avatar
    starbond is offline Cadillac Owners Member
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    Re: Unusual noises or am I crazy?

    Im glad you said that because that's what I think it is too. How much work would it be to replace the lower fluid filled mound?

  9. #8
    Ranger's Avatar
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    Re: Unusual noises or am I crazy?

    Not sure. Mine was done under warranty. Several people here have done it though. I believe there is a tutorial in the Tech Tips section.

  10. #9
    jimsbox is offline Cadillac Owners Enthusiast
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    Re: Unusual noises or am I crazy?

    Pain in the butt on a 00 Deville, have to partially drop the cradle and lift the engine... check out the tutorial.

  11. #10
    starbond's Avatar
    starbond is offline Cadillac Owners Member
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    Re: Unusual noises or am I crazy?

    I might have figured out the problem to the knocking. The A/C compressor is nearly on its last leg. I pulled the relay and started the car and bam, knocking is gone. The compressor would also explain why my a/c is no longer cold.

  12. #11
    starbond's Avatar
    starbond is offline Cadillac Owners Member
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    Re: Unusual noises or am I crazy?

    Here's the video anyway Submariner. It show the ignition, reving, gear changes. from a cold start. I heard some buzzing(?) coming from near the coil pack?

    https://vimeo.com/46894599

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