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2004 - 2008 F150 2004, 2005, 2006, 2007 and 2008 Ford F150's with 5.4 V8, 4.6 V8 or 4.2 V6 engine
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  #331 (permalink)  
Old 02-26-2014, 08:15 AM
scodill scodill is offline
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Originally Posted by ironbandit View Post
I've been thru the thread, all 22 pages of them, and I have a burning question. If the half shafts turn when the 4WD is engaged, but the wheels don't move, what is the problem? Is it in the IWE (what does that mean?) vacuum system or in the hub?

We put the 4 corners up today, and ran the truck with no wheels on the ground. With the 2WD engaged, the front wheels can be turned over with or without the engine running. When either the 4WH of 4WL are engaged, the same is true, and the the wheels can turned in reverse while the half-shafts are turning forward. We're still recovering from PAX and REX here in MD, so we have to clear snow from the place to do these checks and work.

Any ideas are greatly appreciated. I am just baffled...
Sounds like your Integrated Wheel End hubs are not engaging. Since Vacuum disengages the hubs, a leak shouldn't be your problem. You may have a stuck IWE solenoid like I do (see above post) or actuators that are simply stuck in the open position.

I suspect the solenoid. Disconnect the output line and see if it still pulls vacuum when the 4WD switch is engaged. If it does, then you need a new one. The 4WD switch is supposed to make the solenoid turn off the vacuum to the actuators.
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  #332 (permalink)  
Old 02-26-2014, 10:06 AM
ironbandit ironbandit is offline
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Thanks for getting back to me about this. I have 2 new Actuators on the way, and picked up a new solenoid yesterday. Now, we're just waiting for the weather to clear so the work can be done...
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  #333 (permalink)  
Old 03-17-2014, 08:52 PM
dorkenstein dorkenstein is offline
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Originally Posted by xjcamaro89 View Post
Possible. If water got in the system and seized up the actuator it could be holding vaccum but stuck in the engaged position.
I have a question. Forgive me for not going through every page of this thread to see if it's been answered but I'm really short on time. As you mentioned in your original post, a person could unplug the line at the intake and cap both ends to make the actuators lock in place until they could figure out what was causing the issue. Well, I did that and I STILL get the grinding noise from the front passenger side. Of course, I've driven this thing a while since my IWE solenoid went out but the sound wasn't very bad until just recently. So I FINALLY changed out the solenoid today, which fixed the issue of my 4x4 light not working but it didn't fix the grinding. Probably a dumb question now but could this be a sign my hub is screwed as well as the actuator?
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  #334 (permalink)  
Old 03-18-2014, 09:23 AM
ironbandit ironbandit is offline
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I've just completed replacement of both actuators and the solenoid, which did, in fact, cure the issue. As I found while taking it apart, the passenger side was engaged, but the driver's was not. Getting the 6 bolts at the passenger side transaxle out was fairly easy with my helper standing on the brake, but he had to use a pipe wrench on the half-shaft axle for the driver's side. Once I had the driver's actuator out, it seemed to function alright, but there may have been a leak in the diaphragm. Also, closer examination revealed the beveled edge caused by an actuator engaging only partially and spinning.

If you are only hearing the grinding on one side, I would replace that actuator. It took me the better part of 4 hours to replace all of the parts mentioned, so it should be a 2 hour task for the one side. Get the front end up on jack stands with the engine off, see if the half-shafts turn when the wheels are turned. Without the vacuum of the engine to pull back the actuators, they should both be engaged in the hubs.
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Old 03-18-2014, 09:24 PM
dorkenstein dorkenstein is offline
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Well, thanks anyway guys but if I would have just jacked it up and checked it in the first place I wouldn't have wasted your time with my question. Jacked it up today, actuators worked fine. So I decided to give the passenger wheel a jiggle. BINGO! That thing had quite a bit of wiggle to it. Replaced the hub assembly and it drives like a dream.

Plus, thanks to xjcamaro89 and a few others here, troubleshooting any future issues should be a LOT easier.
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  #336 (permalink)  
Old 05-01-2014, 04:30 PM
fdex43 fdex43 is offline
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IWE problem?

I have a 2005 Ford Expedition that is making a loud noise from the front passenger side. It's not exactly a grinding, but best description I can come up with is a washboard type sound. It only lasts a few seconds and is very intermittent, usually at higher speeds and sometimes when making a slight turn or curve to the right. After reading this, we replaced the solenoid which did not take care of the problem. The vacuum appears to be fine. We have it in the shop and they have replaced the wheel bearing and the axle shaft. The noise is still happening, again very randomly. This is our family vehicle and I do not feel safe driving it. Any suggestions?
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  #337 (permalink)  
Old 05-18-2014, 07:13 PM
Laddius_Maximus Laddius_Maximus is offline
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Gas mileage

So I'm pretty sure my solenoid is busted but how much will my gas mileage be affected? I'm moving out west from NC and I want my truck to as fuel efficient as possible.
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  #338 (permalink)  
Old 06-01-2014, 04:43 PM
sherwin johnson sherwin johnson is online now
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OK all just read this entire thread and still have a question...
I put my truck in 4hi last night just to keep things moving. Also went into 4lo for a bit. Dash lights work like they're supposed to. Ok so I try to put it back in 2hi and it won't go. 4hi light stays on. It'll go into 4lo and back to 4hi no problem but not 2hi. Tapped on tcase motor with a hammer, nothing. Truck stills puts power to all four wheels when switch is in 2hi (floored it on a gravel road).
What activates the dash light? The tcase motor or the iwe solenoid? If the tcase motor is shifting properly why do I still get power to all four wheels? Does the solenoid have to work before the tcase motor will shift??
Sorry for all the questions just need a bit of help here. Thanks in advance guys...
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  #339 (permalink)  
Old 06-06-2014, 10:40 PM
bmcgann bmcgann is offline
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Grinding Noise

have a 2007 F150 4x4. I have had some issues with the vacuum as I had that grinding noise going on from the actuators. I replaced them and the solenoid. The driver side wheel hub was bad so it too was replaced. After all of that I was still having vacuum issues because it was not operating properly. I found 2 check valves that were bad. Went to the ford house and bought replacement parts. I got them installed tonight.
Here is where it is confusing me. I jacked the front end up and started the truck. The wheels will turn properly without the shaft turning. So I go to drive it and it is like I am losing vacuum because I hear the grinding noise. It sounds like it is coming from the passenger side. Not sure why it turns fine and no noise when I am parked and have it jacked up turning the wheel but then it happens when I am actually driving it.
Any thoughts or suggestions?
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  #340 (permalink)  
Old 06-28-2014, 06:30 AM
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tjcprop tjcprop is offline
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Thank you for that write up. A typical 4wd problem I heard these trucks have is the vacuum line coming off at the wheel. Which occurred to me during a snow plowing run. So my handy mechanic custom made brackets to keep this from occurring again.
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  #341 (permalink)  
Old 07-04-2014, 04:15 PM
Bbss5293 Bbss5293 is offline
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I believe this is the same problem I am having with my 08 fx4 but the weirdest thing happens along with the grinding. My instrument cluster and my radio go out right before the grinding starts. Did this happen to anyone else? Can anyone explain this?
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Old 07-04-2014, 04:15 PM
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