Idle Up Valve
02-26-2010, 05:20 PM
#3
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That large black screw controls the idle-up for the power steering pump and the A/C compressor on some models. The purpose is to allow for a bump in the idle speed while the power accessories are running and placing a load on the engine at idle.
02-26-2010, 06:00 PM
#4
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Technically, it's called the "Idle-Up Valve", but for lame-man's terms, you can use carguygt500's definition 
It works in conjunction with a vacuum valve on the power steering pump, as well as a VCV on top of the valve cover that triggers with the AC compressor clutch (if equipped with AC)
You will not find one on a truck with no power steering and no AC, as there's no need for the valve then, and there's just a plug there
It works in conjunction with a vacuum valve on the power steering pump, as well as a VCV on top of the valve cover that triggers with the AC compressor clutch (if equipped with AC)
You will not find one on a truck with no power steering and no AC, as there's no need for the valve then, and there's just a plug there
Last edited by iamsuperbleeder; 02-26-2010 at 06:03 PM.
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