Compression Ignition Addict
Join Date: Mar 2007
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A vacuum leak will not cause 4 low to not work. All they use vacuum for is to lock and unlock the hubs if its auto.
I have a vacuum leak, everything through defrost. I just have to turn hubs to 'lock' and 4hi and 4lo work like they should. 4hi and 4lo aren't tied the vacuum system, just the hubs like stated.
Question though, could you hear your vacuum pump running while you were in the cab before you started it or was the pump silent? How did you diagnose it as a bad vacuum pump? Thanks
2003 centennial edition f250 4x4 ccsb auto w/blackwater long block w/arp's, 4" exhaust, airaid intake, ODawg's manifold, itp's reg return, sap modified solenoid, DC power 185amp alt, motorcraft 850cca, Warn Hubs, RS 55w 6k hid's, harley headlights, bpd 58v 6 phase, bpd water pump, dieselsite coolant filter, elc coolant, php gryphon, Xcal2 w/unlimited tow, new hfcm, glowshift fuel psi gauge, icon level kit, 20" kmc hoss, 305/55 terra grapplers TOTALED