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knocking type sound

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by scrappyk5, Apr 22, 2002.

  1. scrappyk5

    scrappyk5 1/2 ton status

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    hey , i was getting freaked out starting saturday morning when i pulled up to a light and heard a faint
    knocking sound. i popped the hood , and i was relieved to hear that its actually coming from either
    the powersteering pump or compressor. i cant tell which though . anyone have any ideas?

    on a positive note. i went down to n.c. this weeekend and picked up my s15 truck that had a tranny
    blowout. towed it with a car dolly and my k5, 250 miles , no problem.
     
  2. Blue Meanie

    Blue Meanie Registered Member

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    you can always use a long dowl rod or peice of wood, screw driver, etc and hold it on the component that you suspect to be making the sound and hold the other end to your ear. works like putting your ear down to train tracks. you should be able to isolate the knock that way. or buy a mechanics stethascope(sp). good luck
     
  3. Blazer_Boy

    Blazer_Boy 1/2 ton status

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    Does the knock go away when you rev it up? If it does, then I'd be scared. Try taking the belt off one or the other to isolate the problem.
     
  4. NoShow84

    NoShow84 Registered Member

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    I had a problem like that; thought it was my power steering pump come to find out what it was, was my hormonic balance had split in to two part. look at that, that might be it and it might not be it
     
  5. weisel

    weisel 1/2 ton status

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    I like to use a long peice of heater hose to isolate the noise. Same idea as Blue Meanie, but different equipment. Seems to work a little better for me.
     
  6. MudbogAD

    MudbogAD 1/2 ton status

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    Maybe it's an exhaust leak. Sometimes when they leak there at the head it sounds like a knocking sound.
     
  7. scrappyk5

    scrappyk5 1/2 ton status

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    thanks guys , well the knock did go away when i reved it , but it would come back. i also thought that it
    might be the engine , but it a spuratic knock , which means its not a constant beat. also this morning, it
    was gone. maybe the dampness in the air caused it , cause it was raining. dont know , but i am putting
    all new belts on this weekend becouse they are needed . if the sound is there again , i will see then , but
    if not , i guess i will have to wait till whatever it is breaks.
     
  8. Mudstud

    Mudstud 1/2 ton status

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    If it's a spuratic sound like a rock dancing around in the engine check the tork converter bolts. Don't drive it untill you rule these bolts out cuz if it is these and you shear the bolt head(s) off you'll really be hating life.
     
  9. reddog64

    reddog64 1/2 ton status

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    mine made that noise.. then i found out my BBC was toasted...

    Good Luck...
     

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