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engine knocking :(

This is a discussion on engine knocking :( within the Internal Engine forums, part of the LSx Technical Help Section category; the other night i was driving home with some friends and my buddy lined up next to me in his ...

  1. #1
    Member camarospade's Avatar
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    engine knocking :(

    the other night i was driving home with some friends and my buddy lined up next to me in his vette and wanted to have some fun but when i punched it, it didn't jump in the rmps at first. and it was making a loud noise in the engine and now it makes it at idle and when i rev it up. it was a quart low on oil and the oil was BLACK. any idea on what it could be? today we tested the rockers and lifters and it wasn't them. gonna go deeper tomorrow.. ideas, thoughts, comments?

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    Member stew215's Avatar
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    any smoke coming out the exhaust?

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    Member camarospade's Avatar
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    Quote Originally Posted by stew215 View Post
    any smoke coming out the exhaust?
    some white smoke when i would get on it.

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    Senior Member tatertot91's Avatar
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    Sunset Orange Metalic
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    bent rod?

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    Member camarospade's Avatar
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    Quote Originally Posted by tatertot91 View Post
    bent rod?
    that's what we're checking tomorrow. the rockers seem to be fine. but after that it was getting too dark to keep checking

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    Member stew215's Avatar
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    maybe a bent valve ? I dont have the best diagnostic skills so hopefully someone with more experience will chime in.

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    I lika da Chevy's LETHALxLS1's Avatar
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    Do you have a oil catch can? If not oil can/will go into the TB when you get on it hard which may explain the low oil.......

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    Any change in the oil pressure before and after it started acting up?
    TSP 347 SB, TSP Stage 2.5 PRC LS6, TSP MS4, Performabuilt Stage 2 4L60E, Yank PT4000, 4.11s, Fast 90/90, FTRA Cold air intake+all the free mods, Dynatech Supermaxx Exaust System, DMH Cutouts, Hooker Catback/FTRA Tips. Tuned by RPM/Garner NC. 11.28@119

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    Member camarospade's Avatar
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    Quote Originally Posted by PFM View Post
    Any change in the oil pressure before and after it started acting up?
    not that i noticed.

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    Exalted Cyclops 67CamaroRSSS's Avatar
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    Knocking at idle could a spun rod bearing...

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    Senior Member tatertot91's Avatar
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    Sunset Orange Metalic
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    Does it go away when it gets to operating temp?

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    Member camarospade's Avatar
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    Quote Originally Posted by tatertot91 View Post
    Does it go away when it gets to operating temp?
    no its there all the time

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    Member camarospade's Avatar
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    Quote Originally Posted by 67CamaroRSSS View Post
    Knocking at idle could a spun rod bearing...
    Any help with tips on how to tell?

  14. #14
    ʢ ൧ ൨ ൩ ൪ ൫ ൬ ൭ ൮Ր Ց Ւ Փ Smittro's Avatar
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    Motors is toast... imho

    I'm guessing the mileage is over 100K ? Best way to tell would be to drop the pan.. WHite smoke is usually an indicator of coolant being burned also.. Leaky head gasket can lead to a spun bearing if coolant is becomming present in the oil..
    Last edited by Smittro; 09-30-2010 at 12:45 PM.
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    Senior Member tatertot91's Avatar
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    Quote Originally Posted by camarospade View Post
    no its there all the time
    A spun rod bearing usually tends to knock when cold then goes away or wuiets down when the motor is at operating temperature. Not the case every time, but sounds like something else to me

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    Member camarospade's Avatar
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    Quote Originally Posted by Smittro View Post
    Motors is toast... imho

    I'm guessing the mileage is over 100K ? Best way to tell would be to drop the pan.. WHite smoke is usually an indicator of coolant being burned also.. Leaky head gasket can lead to a spun bearing if coolant is becomming present in the oil..
    it actually had just broke then 100k marker that night..

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