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Slow throttle response?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by nau81blazer, Mar 11, 2005.

  1. nau81blazer

    nau81blazer 1/2 ton status

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    Hey,

    More carb questions. When I press on the gas pedal is take about a half a second for the engine to get power. Is that leak or bad mixture or what? Also, how do you tell if your carb is getting too much/not enough fuel. I was always told that you shut the fuel all the way down then slowly back the screws off until is idle's smooth? Anyone else? Thanks for the help and the patience,

    --Adam
     
  2. southernspeed

    southernspeed 1/2 ton status GMOTM Winner

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    The lag sounds like an air leak at the manifold to me. If it's the idle mixture screws you're talking about then yes, you can do it that way. In till it stumbles, out till it stumbles, then set it about half way between the 2.
     
  3. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    a bad or sticky accerator pump will do the same thing, mine does and its sticky.
     
  4. Paxx

    Paxx 1/2 ton status

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    Also if your running a bigger carb you will notice more of a delay before you get the acceleration. I went from a 750 to a 600 and the throttle response was immediately noticable but the top end was lacking.
     
  5. nau81blazer

    nau81blazer 1/2 ton status

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    Thanks for the info guys! I'll make sure to check all of the manifold bolts and carb bolts. I'm running a 670cfm eldelbrock with a 350 engine. Is that too much? What do you think? Thanks again guys!

    --Adam
     
  6. southernspeed

    southernspeed 1/2 ton status GMOTM Winner

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    670 should be fine. Big 83 is right about the pump though so check it out too!:grin:
     
  7. nau81blazer

    nau81blazer 1/2 ton status

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    Cool, so the accelerator pump is something in the carb right:crazy: ? Not the fuel pump right? Thanks for the help guys!

    --Adam
     
  8. southernspeed

    southernspeed 1/2 ton status GMOTM Winner

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    Yeah, the pumper is in the carb and puts a shot of extra fuel into the venturi when you hit the gas pedal.:)
     
  9. nau81blazer

    nau81blazer 1/2 ton status

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    Cool. Thanks!:thumb:

    --Adam
     

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