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Name that knock

This is a discussion on Name that knock within the General Help forums, part of the LSx Technical Help Section category; Long time lurker first time poster.... First some background. After roughly 2 years stored in my garage (would start car ...

  1. #1
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    Red
    O1 WS6

    Name that knock

    Long time lurker first time poster....

    First some background. After roughly 2 years stored in my garage (would start car about once a quarter and let idle to normal temp range then turn off) I decided to try and get my '01 WS6 back out on the road. Car had not been started since Oct./Nov. time frame. Charged the battery. Checked the oil/steering fluid/brake fluid. Oil was a little low but still with in oper. range. Turned key on and off a few times allow fuel pressure to build then turned the engine over and it fired up. Let it idle to running temp all the while listening to the tick-tick-tick of the lifters like it's had for a while now. It idled rough as to be expected.

    After 15-20 minutes of idling I decided to take some old oil from a recent oil change (5w30 mobil 1) and pour alittle in while it was running to bring the lvl up some. Shortly after that I heard the knocking noise shown in the video.

    I then decided to siphon out all the old gas out/change fuel filter, change oil/filter in hopes that bad gas was causing the knocking. While I had the fuel pump fuse out I turned the engine over many times and did not hear any knocking just typical engine turning over noise.

    Added 5 gals of new gas w/ approx 8oz of seafoam

    Put fuel pump fuse back in fired up heard knock again.
    Pulled fuel pump fuse again fired it up and let it run out of gas. Heard knock and while engine was dying heard rubbing sound kinda like something stuck in vacuum beater bar when you turn it off.
    Turned it over again with fuel pump fuse still out no knocking.

    Symptoms I saw.

    Some water dripping occasionally out of tail pipe.
    Water was black in color and did not feel oily. (May have been from old gas?)
    Light white/grey colored smoke coming out of exhaust. It was not a lot. I'm thinking it's probably due to seafoam. Did not have smoke proir to oil/gas change.




    Thank in advance for the help!

  2. #2
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    O1 WS6



    Thank in advance for the help!

  3. #3
    Veteran 0rion's Avatar
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    sounds like a spun bearing to me.......sorry for your loss.

  4. #4
    None Shall Pass Knight's Avatar
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    I'm with Orion. A little hard to tell by the video. I'd avoid running it, and start disassembling.

  5. #5
    ʢ ൧ ൨ ൩ ൪ ൫ ൬ ൭ ൮Ր Ց Ւ Փ Smittro's Avatar
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    Quote Originally Posted by 0rion View Post
    sounds like a spun bearing to me.......sorry for your loss.
    Quote Originally Posted by Knight View Post
    I'm with Orion. A little hard to tell by the video. I'd avoid running it, and start disassembling.
    I agree going from what can be heard sounds like something bottom end related to me too.

  6. #6
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    Thanks for all the replies thus far!

    How much would run on average to replace the spun rod bearing etc from a shop to fix? I know they will have to pull the engine.

    Or can this be a DIY? I've never pulled an engine before but since this is a hobby car it's not like I have to do it quickly to get back on the road.

    Either way anyone know a good shop for rebuild/performace in Indy?
    Last edited by DefelRadar; 04-02-2012 at 01:01 PM.

  7. #7
    its short but its skinny. jiveass's Avatar
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    i just went through this. if you want to replace the bearings, you will need to get your crank and rods inspected to see if they can be reused. change the oil pump and timing chain while youre in there. it can be done on your own if you got the time and the equipment. but its a pain in the ass....i thought i was gonna rebuild, but i went the cheap route and put a complete 5.3 in there for way less than a rebuild would cost. letting a car sit for a long period without driving it can be hell on an engine. the fuel system gets gummed up. all the oil settles in the pan and has to prime back up when you start it up again. its bad business.

  8. #8
    Veteran 0rion's Avatar
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    stroke it.......

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    I believe 02SweetSS did this himself and spent under 1K.
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  10. #10
    Veteran 0rion's Avatar
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    I keep listening to this over and over........I'm starting to think it's a collapsed lifter maybe. That second video where you rev it a little bit it sounds to fast and not deep enough to be a spun bearing.

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