![]() The proper adjustment is to set the spring-loaded linkage so there is minimal clearance between the arm and the throttle linkage at curb idle. It indicates that, for whatever reason, someone has tightened the adjustment on the linkage. Even better, the fix is both quick and easy. It’s common to find the throttle linkage moves 10 to 15 degrees before the accelerator pump linkage begins to move. The instant the throttle linkage moves, the accelerator pump arm to the cover should also move. A prevalent issue with Holleys is excessive clearance between the accelerator pump linkage and the arm extending from the accelerator pump cover.Ī quick test to determine this is to remove the air cleaner and move the throttle linkage slowly while watching the accelerator pump arm. Older Holleys that have been around for a long time tend to suffer abuse from “tuners” who like to fiddle with a carburetor with no realization of the consequences. Making the proper diagnosis is a little bit like detective work, looking for clues. ![]() Limber up those wrench-turning fingers, and let’s get started. We’ll run through a basic setup so you can at least start with something close to what your carb needs, and then get into some more extensive tuning exercises. What makes this even easier is that Holley offers a phalanx of parts to help with the tuning process. This story will focus on how to avoid these Holley carb-sneeze issues. You are on your own with social blunders, but we can help with curing those accelerator pump problems. It’s embarrassing, especially if you’re friends are nearby, like the party foul nobody wants to make. The classic off-idle stumble causes the engine to hesitate, or worse, sneeze into the air cleaner. You both look at each other and nod knowingly… ![]() The engine stumbles, coughs, and then accelerates. ![]() All the doors and windows are open when you hear the sound of some distant small-block losing the battle to accelerate. It’s an early July evening, and you’re in the shop with a buddy working on your car. ![]()
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