Compression Ignition Addict
Join Date: Feb 2010
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4x4 wont engage (yes i searched)
so to start off yes i have searched and couldnt find how to test and find out which part isnt working. my a/c and heater all work fine, both the 4x4 switched on and without. i can change where the air comes out with no problem. also i can hear my vacuum pump coming on. when i undo the two vac lines that run to the solenoid i can hear the air for a sec then it fades away. is the pump not pulling enough? with the line connected to the solenoid and in 4x4 i can undo the vac line that leads into the knuckle and i feel/hear nothing. i even tried bypassing the solenoid and got nothing coming out of the vac line by the knuckle. when hubs are locked im golden so transfer case, transfer case motor and drive shaft are all good.
how much vac is needed to engage the 4x4 and how can i test that?
is the vac pump and all or nothing thing or could i just not be pulling enough?
does bypassing the solenoid and still getting nothing eliminate it as the culprit?
any help would be appreciated. thanks
06 f350: 8" ICON 2.5 resi's, ouo ala's, pmf track bar, dual stabilizers, custom 5" exhaust, 37" BFG km2's, 4.30s, 08 tailgate w/step, 08 tail lights, coolant filter, BPB oil cooler w/p 58v ficm and radiator, ARPs, 175cc, MTW s1 billet, ported intake, egr delete, onboard air and gearhead tunes
All the above just to haul the 900hp street mustang