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Need advice for idle problem with engine just installed

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by vegas76k5, Aug 30, 2003.

  1. vegas76k5

    vegas76k5 Registered Member

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    I finally got my freshly rebuilt 350 installed and the cam broke in. Now that I am trying to fine tune it, I can't get it to idle at the right RPM. It idles way to fast. After it warms up, the idle does drop slightly, but not low enough. I have the screw in the carb adjusted for the lowest idle already. I tried spraying carb cleaner at the sealing surfaces with the engine running and had no change in engine speed. I was told I will have to pull the intake manifold off and use RTV on top of the gaskets. Before I do all that, I figured I would see what you guys say.

    BTW - It is a 76K5, rebuilt 350, used Holley aluminum intake manifold, new Truck Avenger carb, new Accel HEI distributor.

    Thanks for any help.
     
  2. SUBFAN

    SUBFAN 1/2 ton status

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    Get out the timing light, and make sure that is set correctly....

    Use a vacuum gauge and shoot for the highest reading when adjusting the idle mixture....

    Look for a screw on the linkage that will back the carb off some and idle it down too....

    Good luck.....
     
  3. vegas76k5

    vegas76k5 Registered Member

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    Problem solved

    Thanks for the help. I got it working right early this morning. I have never had a vehicle with a carb before. When I hooked the throtle cable up I didn't realize once the choke comes off the linkage moved that much. The cable was holding it like I was pressing the pedal.
     

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