Car dying when idling

Slant 6 Engines

  1. 1971Kyle

    1971Kyle New Member

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    I recently replaced the accelerator pump diaphragm on my 1920 Holley. I drove it for a while and it worked good, but the car was a little slower then it used to be. The next day, the car will start but will die shortly after when at idle and will only run when the car is being driven. Stopping at lights or stop signs causes the car to die abruptly. Is it related to the accelerator pump?
     
  2. RustyRatRod

    RustyRatRod Weenie idiot loser. FABO Gold Member

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    Probably not. Sounds like maybe a vacuum leak. Make sure all the carburetor fasteners are tight. ALL of them. The base plate nuts. The screws that hold the carburetor together. They are all notorious for working loose over time. That could be your issue. I've grabbed a slant carburetor before and twisted it probably 1/8" in either direction before because all the screws holding it together were so loose. It was running like you describe, too. Tightened everything up and it ran great. lol
     
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    • paulclark

      paulclark Early A fanatic FABO Gold Member

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      ^^ this. sounds like a vacuum leak. grab a can of starter fluid and spray around the base and areas where a leak might be (dont let it get in the top). if the engine races, theres your leak
       
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      • RustyRatRod

        RustyRatRod Weenie idiot loser. FABO Gold Member

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        I agree 100% except I don't recommend using anything flammable to check for vacuum leaks. I always use water in a squirt bottle. It will do the same thing without the risk of fire.
         
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        • Lefty71

          Lefty71 Well-Known Member

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          This kinda goes across the board but...... anytime you disturb something there is a possibility that dirt/scale/light corrosion/etc. has been broken loose and moved on down the line. So, maybe the carb needs taken down and cleaned/checked to see if maybe dirt got somewhere it cant get through. Also, if you loosened anything that disturbed a gasket, or replaced any gaskets, maybe an air leak started there, or possibly a tiny piece of gasket material stuch to a flange is now creating a gap??
           
        • paulclark

          paulclark Early A fanatic FABO Gold Member

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          hadn't heard that, I like that idea a lot better
           
        • Rainy Day Auto

          Rainy Day Auto Princess Valiant FABO Gold Member

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          Hair spray works too. It is flammable but when and If it does go up flames, it's more of a flash fire and doesn't get to near the high temps as starter fluid or even carb cleaner
           
        • RustyRatRod

          RustyRatRod Weenie idiot loser. FABO Gold Member

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          I'll take your word for it. lol
           
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