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Weird Noise. What is it?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by zach78k5, Dec 31, 2004.

  1. zach78k5

    zach78k5 1/2 ton status

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    I just got my blazer back from the shop. New tranny, new distributor, and my Holley projection was tuned up. The truck runs great but is sometimes makes a weird noise. I can only describe it as sounding sort of like a dirt bike. Not as loud and it goes away sometimes. Anyone ever heard of this. I can hear it from the engine area, maybe the projection, or something with the exhaust? The sound seems to be just as loud under the driver side. I am not sure what this could be. It doesnt sound horrible but weird. thanks for you help.
     
  2. Cricket

    Cricket 3/4 ton status

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    Did you lay underneath and try to pinpoint the noise? Possibly your trans inspection plate vibrating.
     
  3. Thunder

    Thunder 3/4 ton status

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    Check to make sure the fuel lines aren't hitting the metal firewall somewhere. If they contact the metal you can hear the injectors fire from inside the cab. It makes a weired buzzing noise. Increases in pitch as you rev the engine.
     
  4. JonV

    JonV Registered Member

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    When the shop pulled my tranny and I got it back, the gasket between the catalytic converter flanges on the exhaust pipes blew out as it came loose. It buzzed a bit on its way.
     

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