4.1 Motor? Rattles/Engine Pinging? - Page 2
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HT4100 4.1, 4.5, 4.9 Discussion, 4.1 Motor? Rattles/Engine Pinging? in Cadillac Engine Technical Discussion; Jojo, why don't you make a youtube video of the rattling sound when it happens?...
  1. #16
    Sevillian273's Avatar
    Sevillian273 is offline Cadillac Owners Connoisseur
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    Re: 4.1 Motor? Rattles/Engine Pinging?

    Jojo, why don't you make a youtube video of the rattling sound when it happens?

  2. #17
    JoJo_Brand_Star is offline Cadillac Owners Member
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    Re: 4.1 Motor? Rattles/Engine Pinging?

    When the car is running, you don't hear it unless you put it into drive then accelerate. Now while in park, i hold the brake down and the accelerator at the same time and i heard the noise still.

  3. #18
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    HUF
    HUF is offline Cadillac Owners Connoisseur
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    Re: 4.1 Motor? Rattles/Engine Pinging?

    Quote Originally Posted by JoJo_Brand_Star View Post
    When the car is running, you don't hear it unless you put it into drive then accelerate. Now while in park, i hold the brake down and the accelerator at the same time and i heard the noise still.
    Do you hear the noise when you accelerate backwards (in reverse)? Just be careful.
    Did you get off road recently? Or hit something with the underbody?

  4. #19
    steelybill is offline Cadillac Owners Enthusiast
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    Re: 4.1 Motor? Rattles/Engine Pinging?

    Maybe you have a bad engine mount ? Just a thought. Even a cracked flex plate on the engine could rattle.

  5. #20
    JoJo_Brand_Star is offline Cadillac Owners Member
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    Re: 4.1 Motor? Rattles/Engine Pinging?

    that just may be the issue, my motor mounts are bad.
    I found that out like a few weeks ago, that i needed to replace them.

  6. #21
    daniel58 is offline Cadillac Owners Fanatic
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    Re: 4.1 Motor? Rattles/Engine Pinging?

    My vote would be to replace the EGR valve, I had this same problem with an 83 Eldo 4100 and a new EGR took care of it.

  7. #22
    JoJo_Brand_Star is offline Cadillac Owners Member
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    Re: 4.1 Motor? Rattles/Engine Pinging?

    I noitce a few days ago, my egr code came up when i ran my diagnostic.
    But i change all my fuses, and it went away.
    So i figure my egr is good, since the codes aren't coming up now.
    Should i still replaced it, anyway?

  8. #23
    steelybill is offline Cadillac Owners Enthusiast
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    Re: 4.1 Motor? Rattles/Engine Pinging?

    You changed all the fuses? Why? If you had the ECM power off, you likely erased the EGR fault that came up. It will be back if the EGR is a problem. There is no knock sensor on that engine system, so the EGR valve or it's passages in the manifold my be a problem like mentioned above.

  9. #24
    JoJo_Brand_Star is offline Cadillac Owners Member
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    Re: 4.1 Motor? Rattles/Engine Pinging?

    Well...
    Until then whenever it appears again, i will just get egr work done to it.

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