car took a dump today
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HT4100 4.1, 4.5, 4.9 Discussion, car took a dump today in Cadillac Engine Technical Discussion; The car has been running fantastic since the last bit of work. No problems at all, really. I've even taken ...
  1. #1
    ehall's Avatar
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    car took a dump today

    The car has been running fantastic since the last bit of work. No problems at all, really. I've even taken it on a couple of medium distance drives over to the next state a couple of times for day trips and it's done fantastic, singing along at 70 MPH and getting 30 MPG.

    Today I went to the parts store for some stuff for my Jeep Cherokee and when I came home, I went to the end of the cul-de-sac, did a three point turn and backed into my yard like I do every day. On the last reverse into my yard the car started making a really horrible noise.

    I turned it off, since the Jeep was blocking the driveway, and after I finished putting that back together went and started the Cadillac again. It makes a sound that is a combination of a spark plug missing and a hole in the exhaust, I mean it just sounds bad man. It is even worse when I put it in gear, then it sounds like the exhaust and transmission are both going to fall out, with a whole symphony of nasty noises coming from everywhere.

    ****ing POS took a dump today that's for sure.

    Any thoughts? I'm broke after doing a bunch of body and interior work on the Jeep and won't be able to do anything until June so I'm open to guesses and poking at what I'm told.

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  3. #2
    quins90lac's Avatar
    quins90lac is offline Cadillac Owners Enthusiast
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    Re: car took a dump today

    could it posably be the o2 sensor broke off i know when mine did it made a really bad noise like a hole in the exhaust

  4. #3
    ehall's Avatar
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    Re: car took a dump today

    I finished working on the Jeep and took another look and listen to the Caddy. I'm guessing it threw a piston or a valve or something. It is definitely missing on one cylinder, and it makes a POP POP POP noise where the miss is. Also the oil level is higher than usual, and the coolant reservoir is low, although both of them look fine.

    It might be something simple and it was not run more than a minute or two since it happened, but at this point I am guessing that I will have to do the 4.9 swap in June.

  5. #4
    Lithorian's Avatar
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    Re: car took a dump today

    your coolant may have poured into your engine via the intake, emulsifying and effectively lowering your oil's ability to lubricate, destroying the interior of your motor.

  6. #5
    ehall's Avatar
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    Re: car took a dump today

    That would be expected from long periods of mixing, but I doubt it's the case with one or two minutes

    OTOH who gives a shit, the engine is blown

  7. #6
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    Re: car took a dump today

    Broken rocker arm supports.

  8. #7
    Lithorian's Avatar
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    Re: car took a dump today

    that is a very good possibility, rip the valve covers off man, see hwat it looks like :P

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    Re: car took a dump today

    you might be having the same problem as me. every now and then (like 3 or 4 times)i would start mine and it would make this horrible noise like something was rubbing up on the fan or like there was a hole in the exhaust. it would go away after like ten seconds and i would just drive. eventually it got to the point where i couldnt even drive and it would stall the engine. at the same time i noticed that my oil level was high and my coolant was low. turned out to be a blown intake manifold gasket. check your oil fill cap, mine was covered in caramel shi$ cuz of the mixture of the oil and coolant with the pellets. i decided that if im going that far into breaking the engine down, i might as well do head gaskets just to be safe. all i got left is the right head, which is a PITA, then i can start putting everything back together. good luck man!!!!!

  10. #9
    ehall's Avatar
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    Re: car took a dump today

    Given that the intake gasket was just recently replaced, it's a good theory

  11. #10
    ehall's Avatar
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    Re: car took a dump today

    Quote Originally Posted by illumina View Post
    Broken rocker arm supports.
    the mechanic says there is a broken rocker arm cradle

    that doesn't explain the oil and coolant levels, but that could be something else, or a figment of my imagination

  12. #11
    ehall's Avatar
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    Re: car took a dump today

    I got it back yesterday and the thing is running like a top again. Since it only ran for less than a minute after the rocker cradle broke, there was no valve damage. There are some other problems with the innards of the thing and it will still need to be replaced sooner than later, however my Jeep engine is even worse so I am going to go back to finishing that project.

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