4X4 vacum trouble - Ford Powerstroke Diesel Forum

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post #1 of 13 Old 12-09-2012, 09:50 AM Thread Starter
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4X4 vacum trouble

So I just bought my 2005 F-250 a few weeks ago and during the test drive I made sure the 4X4 worked. I just got my truck back from getting the studs/egr/etc work done and now it won't engage 4X4 without my locking the hubs manually.

I dont know too much about the vacum system but I did find this spot under the hood that looks like something should connect to. I dont see a hose laying around anywhere though.



Could this be it and if so where should I look for the other end?

Thank
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post #2 of 13 Old 12-09-2012, 10:27 AM
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Nothing connects to that. Did they pull the cab when the work was done?

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post #3 of 13 Old 12-09-2012, 01:57 PM
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On the passenger's side of the engine compartment there is a round looking item about the size of a football. If the cab was taken off they unplugged the vacuum pump, which is the football looking thing, they probably forgot to plug it back it. I would start by looking for any unplugged electrical connections on that side of the engine compartment. Although, if it's unplugged your hvac controls might not work right.

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post #4 of 13 Old 12-09-2012, 06:29 PM Thread Starter
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I found the problem, the line was broken where it goes under the engone from the right to left hub. I could not find a small enough fitting to fix it so I bought a piece of tubing with an inside diameter about the same as the outside diameter of the stock tubing. I stuck both ends of the stock tubing inside of the it and put heat shrink around the whole thing. Seems to be working now.

Thanks for the responses.
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post #5 of 13 Old 12-09-2012, 07:09 PM
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Quote:
Originally Posted by frdbronco8 View Post
I found the problem, the line was broken where it goes under the engone from the right to left hub. I could not find a small enough fitting to fix it so I bought a piece of tubing with an inside diameter about the same as the outside diameter of the stock tubing. I stuck both ends of the stock tubing inside of the it and put heat shrink around the whole thing. Seems to be working now.

Thanks for the responses.
Nice

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post #6 of 13 Old 12-10-2012, 05:18 PM
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Quote:
Originally Posted by frdbronco8 View Post
I found the problem, the line was broken where it goes under the engone from the right to left hub. I could not find a small enough fitting to fix it so I bought a piece of tubing with an inside diameter about the same as the outside diameter of the stock tubing. I stuck both ends of the stock tubing inside of the it and put heat shrink around the whole thing. Seems to be working now.

Thanks for the responses.
Glad it was an easy fix. I am going to be doing ARP studs here in the next month or so and reading about small issues like this helps. Thanks..

Joe

2006 F350 XLT CrewCab 4X4
325/65R18
EGR Delete
Zoodad Mod
High-Idle Mod
Sinister Coolant Filter
ARP Head Studs W/ OEM Gaskets (Installed myself)
Upgraded Fuel Spring
Updated STC Fitting
Updated Oil Cooler Screen
Updated Dummy Plugs/Standpipes
6.4L Banjo Bolts
PHP Ficm Tuner
1/4 Mile 14.2 @ 93MPH

SCT Custom Tunes: MKM, Looney, SRL, SRLXX, Wildman and SPD w/ Early Lock up
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post #7 of 13 Old 12-17-2012, 03:25 PM
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Sorry to hijack but my 4wd won't work right now either. I know it's vacuum, I did the studs and gaskets (cab on) this last summer and now it's not engaging the front hubs. 4wd works when hubs are locked. I'm not sure if I connected all the lines back properly. Does anyone have a diagram or pictures of what the pump and all the hoses should look like? I think I hear the driver side hub do something when I turn the switch to 4 .

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post #8 of 13 Old 12-17-2012, 03:39 PM Thread Starter
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A diagram would be nice, until then I found it easiest to start at the hubs and work my way back looking for the break.
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post #9 of 13 Old 12-17-2012, 03:42 PM
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Originally Posted by frdbronco8 View Post
A diagram would be nice, until then I found it easiest to start at the hubs and work my way back looking for the break.
Yeah, that sounds like my best bet too. I just hope I made all the right hose connections at the solenoid and pump.

05 EX Cab Short
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SCT Innovative tunes
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Offroad MBRP Stainless 4.5 " and up pipe.
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Blue spring , bored 3 hole banjos.
ARP Studs
OEM Ford gaskets.
EGR Delete, cooler delete.
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post #10 of 13 Old 02-04-2013, 03:35 PM Thread Starter
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Well mine is not working again and this time I cant find the break... Guess I will have a new truck with 1960 4X4 technology...... Starting to wonder if I made the right choice.
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