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How to find a vacuum leak.......

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 84CUCV, Nov 4, 2004.

  1. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    I have a 1405 carb on my 80 p/u. It has been suggested to me that I have a vacuum/timing problem. When it get on the gas it shuts down. I thought it was a fuel problem. So what to look for so I can get her running right.

    Thanks for the help

    Mike
     
  2. alec78

    alec78 1/2 ton status

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    Have the engine running. Carefully and slowly spray it with carb cleaner. Listen to the engine. When it changes tone (speed), go back to where you just sprayed. Spray that area again, even more carefully and paying more attention. This will help you zero in on a leak. /forums/images/graemlins/thumb.gif
     
  3. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    Thanks i will give it a try. Mike
     
  4. K5MONSTERCHEV

    K5MONSTERCHEV 1/2 ton status

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    Or use a smoke machine.
     
  5. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Propane works too. /forums/images/graemlins/thumb.gif

    I usually use carb spray or wd 40.
     
  6. crawford

    crawford 1/2 ton status

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    Or use a peice of hose. Put one end up to your ear and check suspect areas with the other end for a hissing/sucking sound.
     
  7. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    Cool thanks more ideas. mike
     

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