Compression Ignition Addict
Join Date: Mar 2008
Location: Santa Rosa, CA
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from the pump there is only a red line, it's tee into the 4x4 solenoid and somewhere into the dash. My vent works fine when I'm not using 4x4. Also is it normal for the vent to blow thru the defrost when i first start up my engine. It only blow threw the defrost for a second or 2 during when i first start up.
Since your vent setting works fine in 2wd then your vacuum leak is somewhere after the 4x4 solenoid.
It could be one of the hoses going down to the front hubs, or it could be a bad hub seal. Either one of these will cause the issues that you are having.
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2005 F-250 CC/SB 4x4 medium wedgewood blue
5" lift, 5" Donahoe rear springs, 35x13.50 MTZ's, 18x12 Fuel Hostage wheels, 4.30 gears, Banks 4" exhaust, Airraid intake, SCT from Innovative, ARP headstuds, Bulletproof ficm, Bulletproof EGR cooler, Scangauge II, Randy Ellis Design lightbar, Street Scene flares, Harpoon mod, Zoodad mod, LED 2010 taillights, Switchback LED front turn signals