Step 1: Get ready to fine-tune your idle. After your Ford F150's engine has been running for a few minutes, shut it off. Turn the ignition key to the "off" position. Do not remove the key from the ignition switch. Step 2: Determine the location of the idle adjustment screws. With a wrench, disconnect your vehicle's negative battery cable. To adjust the idle speed on a fuel-injected car, you'll need to locate the idle air control valve (IAC) and the idle speed adjustment screw. The IAC valve controls the amount of air entering the engine when the throttle is closed, while the idle speed adjustment screw determines the idle speed. Wondering why your motorcycle engine doesn't sound quite right? Does it feel like it's revving too high or too low when you're not giving it any throttle? This article has you covered. We'll dive into a step-by-step guide on how to adjust your motorcycle's engine idle speed. #1. My timing is correct and need to adjust the idle speed. It is low at about 615-620 rpm. How do I adjust it up? Is there an idle screw in the throttle body or is it not that easy..lol The FSM says that I do it through the IAC but dunno if this is it or if it is how do I adjust it at the IAC. thanks of any help. Open the hood of your vehicle and locate the idle control screw on the throttle body. Turn the idle control screw clockwise to make the engine idle faster or counterclockwise to make it idle slower. If you turn the screw too far in either direction, it may fall out. If this happens, turn it back one full turn and try again. KVdoJ.

how do i adjust idle speed