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Thread: Loud unnatural noise

  1. #1
    Join Date
    Jan 2016
    Posts
    89

    Loud unnatural noise

    I unplugged the coil pack to crank the engine so I could bleed the power steering system (long, long story), and when I plugged it back in and fired the car up there was/is a very loud knocking coming from somewhere on the driver side of the engine. I didn’t touch the plugs or wires.

    Thoughts?

  2. #2
    Join Date
    Jun 2005
    Posts
    177
    Uh oh. Exactly how much cranking did you do with the coil unplugged?

  3. #3
    Join Date
    Jan 2016
    Posts
    89
    Lots. It was very slow cranking because the battery was shot (replaced that today), but cranking nonetheless. It was to cycle ps fluid through the hydroboost system I just put in.

  4. #4
    Join Date
    Jul 2005
    Posts
    380
    Good morning


    Is the sound "clacking" or a knocking? The clacking (sometimes known as a tapping) sound could be collapse hydraulic lifters. Check the oil level and Dirty Oil Deposits. Take appropriate action. If good try another restart. It has been my experience serviceable high mileage lifter issue noise should dissipate within 3 minutes after starting. If the car has be down for awhile the 3 minutes should be enough time to pump up the lifters.

  5. #5
    Join Date
    Jan 2016
    Posts
    89
    Itís a metallic (I guess) tapping. Clacking might fit the description. The supercharger knocks a little, and this is a very different noise. Loud and sharp. Almost as if I was tapping a piece of metal with a wrench. Itís rhythmic, too, not intermittent like the supercharger knock. The car sat all winter, was driven from March til May (when the teves went), and sat all summer, being started once a month or so. I fired it up last week and it was totally fine. I only ran it for several seconds yesterday as I didnít want to cause any (more) damage.

    Why would appropriate action mean?

  6. #6
    Join Date
    Jan 2010
    Location
    Bossier City, LA
    Posts
    2,151
    Quote Originally Posted by smac View Post
    Why would appropriate action mean?
    If the oil is low, top it off. If the oil is dirty, change it and the filter.

    RwP

  7. #7
    Join Date
    May 2002
    Location
    Dallas, TX
    Posts
    5,641
    If the last thing you did was to splice into the power steering lines, I'd look around there. Something you can do to narrow the search is take off the serp belts and start it up for a minute. That would at least eliminate the accessories.. power steering, alt, AC, waterpump, etc as the cause.

  8. #8
    Join Date
    Jan 2016
    Posts
    89
    Alright, tomorrow Iíll run the engine for four minutes to see if the sound disappears, if not, Iíll pop the belt off and run it for several seconds, and then Iíll check the oil.

  9. #9
    Join Date
    Dec 2007
    Location
    Salem, OR
    Posts
    6,285
    Did you check the crank pulley/dampener?

  10. #10
    Join Date
    Jan 2016
    Posts
    89
    How does one do this?

  11. #11
    Join Date
    Dec 2007
    Location
    Salem, OR
    Posts
    6,285
    Quote Originally Posted by smac View Post
    How does one do this?
    Engine off, grab the pulley and see if you can move it in any direction by hand. Eyeball it for fresh scrapes, warping etc. Inspect all the fasteners to confirm they're tight and accounted for. Check the belt for damage, fraying, etc.

    Engine running, eyeball the pulley to see if it wobbles.

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