Join Date: Nov 2007
Location: Angelica, NY
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Yeah think of it as a butterfly valve (i think) type thing closing to warm the engine up faster. If you have a egt gauge you will notice it runs a little hotter when the truck is doing this.
2002 F-250 7.3L 4x4,6 Speed,Hyperpac, MBRP 4”dp5” K&N/DIY Intake, Foil Delete, Rough Country leveling kit, 305/70/16 Dunlop Mud Rover
Autometer Ultra Lite ll Pyro Boost- TW tunes
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