Ford Excursion :: 4x4 Selector Switch On Dash Lights Up Properly But Auto Hubs Don't Actually Engage
Jan 4, 2014
My Excursion is having an issue with the 4x4 system. The. 4x4 selector switch on dash lights up properly for 4x4, but the auto hubs don't actually engage. The hubs will lock only if I manually lock the hubs. I can hear relay click, so I don't think its electrical. The hubs had new o rings installed when I did front ball joints a few thousand miles ago, and the 4x4 worked fine up until today.
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And the vacuum pump was replaced.
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After reading the book, I'm afraid I still don't understand. When the hubs are in AUTO, & the shift on the fly selector is turned to 4X4 high, or 4X4 low, is the truck in 4 wheel drive. What happened to free or lock.
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I was using 4x4 High the other day and it was working just fine. Now today, I was at my first parking lot to plow and used the ESOF to shift into 4x4 High and it did not engage with the hubs being in auto mode. The lights on the dash show up indicating that I am, but I am still in 2wd.
If I manually lock the hubs, it engages 4wd high. I tried the same thing using the ESOF to switch over to 4x4 low and it does NOT engage either.
I also noticed that heater blower was switching over to full defrost even though I had it set on the floor setting (manual heat climate *****).
Does this sound like a vacuum leak? I haven't had a chance to test the lines yet. Btw, this is my second work truck and not the one listed in my signature below. It's a 2006 f-350 6.0 xlt.
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I know this is going to sounds lame, my wife can't turn them, they have cover over it that has to be unscrewed to get at 'em. It would be nice to shift in and out "on the fly" as weather condition change.
Is it a difficult change?
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I bought a 2001 Excursion Ltd 4 years ago. A previous owner put Warn Premium hubs on it, which I would have eventually done myself.
I got stuck a couple of weeks ago and tried to use my 4wd. Nothing.
A friend suggested I replace the Transfer Case Motor as it can go out if you don't use it. I got that done today but I still don't have 4wd.
I can hear the transfer case shift and see the drive shaft spinning, but the front tires don't spin.
I thought it was the PVH solenoid, but discovered the Warn locking hubs don't use the vacuum and it has been disconnected/plugged.
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After a lot of reading and troubleshooting, I have come to know that it takes vacuum to engage and vacuum to disengage the automatic locking hubs on the Ford F series and Excursion. Most indications is that ~ 15" hg is required to engage and approximately half that much to disengage them. The mechanism that either engages or disengages them acts similarly to a ball point pen. The full amount of vacuum causes the mechanism to travel to it's limit, where the hub is engaged, whereas half the amount of vacuum applied only causes the mechanism to travel to its midpoint, which is where is should be for disengagement.
In my case, I have tested for vacuum leaks, none are present. I have installed new Ford OEM hub assemblies, a new locking hub solenoid and have tested the function of my vacuum pump. It draws about 13.5" hg of vacuum on the system. I do not have any issues with HVAC controls in the cabin of the truck. When installing the new hubs, I ensured that they are unlocked, the inner spline assy spins freely and once installed, the wheel shaft spins freely by hand. When I shift to 4WD on the dash, the hubs engage and all is well.
Problem I am having is when I shift back to 2WD, the hubs remain locked. I can tell as the wheel shafts are not able to be spun freely by hand. I have tried backing the vehicle, etc. No luck. Furthermore, when monitoring vacuum while engaging and disengaging 4WD, I can see that the full vacuum (~13,5") is applied when engaging. What concerns me is that only 3.5 - 4.0" hg is applied when disengaging. This is certainly not enough to operate the mechanism to the point of disengaging the hubs.
I have considered replacing the vacuum pump as I am only getting 13.5" hg of vacuum, however, when I research the replacement part, many have indicated that a new one only draws about that much, so I do not see the value in replacement.
Have any of you dealt with the same or similar problem and if so, what was your resolution?
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I just recently purchased a 2000 Excursion and had some questions up in another thread. After doing some diagnosing....I have a couple of questions about the auto locking hubs. The problem I have is that even with the vacuum line disconnected from the knuckle and no vacuum...the hubs won't unlock in auto/2wd. I confirmed that the knuckle and the hubs will hold vacuum when I hooked my vacuum pump up to it and it held vacuum (the fitting should be clear as I heard the hub making some sounds). I'm getting ready to pull the hubs to clean and re-grease them. My question is that being they are still locked....will it be any harder to pull them off the spindle and after disassembling them/cleaning them.....when I re-install them....will they be unlocked by default after putting them back on the spline as they have been pulled apart and reassembled?
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I have a 2001 f150 4x4 with the 4.6 Triton motor, the front axle is not pulling in when I switch the selector on the dash, I know the transfer case is switching so that part is ok. I know there are 2 solenoids on the fire wall, my question is which one is which ? every store I call says one has the nub at 9 o' clock and one at 6 o' clock which one of these does the front axle, don't want to order the wrong one ? I checked the vacuum and the blue line going to the axle always has vacuum and as I read the diagram the blue line is 2 wd and the red line is 4 wd so is the 2wd solenoid stuck and preventing the 4wd one from pulling in or is the 4wd one bad ?
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Is it ok to keep my front hubs locked in and the switch in the 2wd position for everyday driving? Only reason I do it is because in auto it doesn't always go into 4wd.
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I have a 2001 f250 7.3 powerstroke it is an automatic. It has the switch on the dash to engage the 4 wheel drive. When I turn the switch nothing happens.. no lights come on or anything. it has warren locking hubs. What my problem is???
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I have a 2003 f250 and I am unable to rotate the hubs from automatic. I have removed them and while I had them apart, I was still unable to rotate the selector. It wouldn't turn even with a crescent wrench putting pressure on it. I repacked them with grease and reinstalled and they still work when in 4 wheel drive. I am just concerned that when the vacuum does go out, I will not get the hubs to manually lock in.
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Should the indicator above reads "4x2, 4x4 hi, 4x4 low" light up when the driving lights (i.e. at night) switch is on?
If yes, how to change the light bulb?
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We got a ton of snow dumped on us today and for some reason my 4WD has decided not to work this year. I have a 2000 F250 4WD Triton V10. The hubs click into the lock position and the dial on the dash lights up 4x4 but I am definitively not engaging into 4WD. I'm pissed because this is specifically the reason i bought a 4WD and it's failing me. I can't find a fuse panel diagram to save my life however all the fuses in the interior of truck look to be fine.
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I have a 1999 Ranger 4x4. My 4wd does not engage when I turn the switch to 4wd lo or 4wd hi. The lights on the dash flash on and off. I disconnected the battery and now the lights are clear. But if I try again to engage it, the lights return. I feel I have a vacuum issue but would like to know more about locking hubs. If I convert them over, how do I know that my system will work? There has to be something else that changes from 4wd lo to 4wd hi. How do I check to see if this is working properly.
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Was about to buy a headlight switch with the Foglights option...realized I miss the auto lamps.
Is there a write-up on how to add these? Looked in the tech folder and didn't see one
What parts are needed?
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I am the owner of a 2009 Accent L (Canadian model) sedan. I have had this car from brand new and I have had two warranty issues with this car in the last 6 months. First at approx.36000 miles (60000Km) the stop light switch started sticking, so the brake lights wouldn't work properly. The second issue was the turn signal/ headlight combo switch malfunctioned and started to smoke. The dealer replaced these under warranty after some hassles.
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I have a 2002 7.3 4x4 truck. The 4x4 will not engage, the lights on the dash don't even light up. I took it to the ford dealer and they said the fuse box and gem module. (800.00 to fix). They said the windshield leaked and shorted then out, so I needed to be replaced? I have replaced the windshield and fixed the leak, my question is the fuse box and gem a plug and play and do different years work?
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2004 fx4, transfer case engages, but front wheels won't engage. I assume the vacuum solenoid is stuck, any other thoughts?
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My reverse lights and back up alarm will not engage unless i hold up on the shifter while in reverse the only thing i found was a adjuster for the indicator....
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ok first off my 4wd has no power at the switch. 2nd I have no dome lights or overhead console lights (but the lights in teh very back work) and the ac controls up top work. either of these common issues or just time to break out a test light and start checking wires?
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