Ford F-150 (2009-2014) :: Vacuum Falling Off To The Hubs When Driving And Light Throttle
Mar 19, 2014
Having issues with the vacuum falling off to the hubs when driving and light throttle. I know makes no sense,but kept fighting this thing making vary harsh rubbing sound since I bought it used and I know its the little collar on the back side of hub that engages to hub to make the 4x4 connection but it looses vacuum when driving and very light throttle/load.
I verified using a vacuum gauge ran inside vehicle when driving. Checked all lines and hubs,everything good. Solenoid has vacuum when running but seems to quit when light load or throttle and as soon as vacuum falls off then the collar starts to engage and rubs but doesn't fully engage. I don't get it. Unless there's something on the computer side of it shutting off the solenoid or something.
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2009 f150 4x4. My front hubs are ratcheting, I probably have a vacuum leak somewhere. Any trick to find it? I had to drive about 90 kilometers to get home, hope I didn't ruin anything. I don't have a vacuum pump, but I have a vacuum gauge.
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I just picked up my new 2011 F150 SCrew with Ecoboost on friday (pictures soon). I noticed after driving it a little, there is a noticeable burning smell...almost like an oil smell. It is even more noticeable after I had been driving with a little more throttle.. i.e. getting the turbos working a little. I attribute this to the normal coatings of oils on the parts but it still is a little concerning at times. I'm sure I'm worried about nothing and this is normal...
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On my '11 5.0L I've noticed at light to mid throttle if I get into 5 or 6 with the rpms down near 1k or so it will have a light but noticeable to me shudder type sensation. At first I thought maybe it was a converter lockup effect or possibly road noise but the more I drive the more I notice it. Very indistinct and mild with no check engine light and mileage was 17mpg mixed so I'm pretty convinced its not an engine shutter- but I have no experiencing dealing with these coyotes yet...
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Front hubs are making a clicking noise pull in 4x4 and it quits also when pulling camper or boat quits make noise when you let off the gas could this be a vacuum line issue or automatic hub issue?
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My 2010 f150 stx 4x4 fails to lock in the front hubs...
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2011 F150 SCREW FX4 6.5' box Ecoboost... All of a sudden I had no power assist for the brakes.
In a "unit down" situation waiting for a replacement vacuum brake pump assembly from Ford? My truck has been stuck at the dealership for going on three weeks now waiting for this part. No one seems to be able to say when the part will be available, which suggests to me that Ford is waiting on the supplier to produce more.
They're paying for a rental, but the 2013 Escape isn't anything near my F-150. A week maybe, I could understand, but on 6/11/2013 it's going to be three full weeks since my truck was towed into the dealership. How many of these things are on the road? How do they not have this part readily available?
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I have a 2010 F-150 FX4 SC 4x4 5.4l w/ automatic that has 52,000 miles on the clock give or take, unmodified with the only exception of a remote oil filter relocation unit.
I bought the truck with 48,000 on it and did not have this noise, I've had it back to the dealer and their best mechanic went for a ride with me and the noise was duplicated and the mechanic had the deer in the headlight look on his face and said he'd never heard anything like that before. I've searched the net for anything similar like this but have not found anything. The noise rears it's ugly head after the truck is warmed up and it first started around 55mph and went away at 65mph , then re-emerged at 75mph and left again at 82mph.
Tried the usual test things while noise was present first loading and unloading the steering left and right, (wheel bearing) no change. Next I applied the brakes (caliper rubbing) no change. Then I tried shifting to neutral (transmission or carrier bearing) no change. I also tried shifting into and out of 4x4 (transfer case) no change. If I speed up above those speeds or slow down below them, the noise disappears.
Recently... the noise seems to be more consistent and when it's present at 80mph and you let off the throttle, the noise is present all the way down to 55mph then magically goes away. The noise to me sounds like a vacuum leak in a rubber hose or a dry spinning shaft in a bushing, sort of a low hum that sounds like it's coming anywhere from the motor to the transmission area.
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I am having a strange issue with my truck. It is a f150 2009 xlt ext cab 4x4 5.4 liter
For the past 2 weeks I've had this light thump about 1 or 2 seconds after the truck starts driving,not really annoying but it kinda got me wondering
Since last week it makes a weird scraping noise from the rear end when coming to a stop (10-0 kmh) it doesn't do it all the time though
For a couple days now it makes this terrible squeaking/scratching/whatever(very loud) noise from the rear end when i accelerate from a dead stop, the one time when i crossed a highway, last night when i backed out of a parking spot (again not all the time).
Also when driving through a parking lot,hitting a few bumps and dips I can hear a rattling noise coming from underneath the truck.
Transfer case due for replacement? I don't know what this could be.....
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I have a 2011 Fx4 super crew and my advance trac warning light comes on and off periodically while driving, I have taken my truck to the dealership about 6 times to have the problem fixed. For some reason they can't fix it, I have tried everything I can to get it fixed but still having the issue.
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Plugged in my SCT when I got home, P1450 code. "Unable to bleed up fuel tank vacuum" I did a search here but nothing in the 09-up section.
P1450 Error Code Excessive Fuel tank Vacuum - Ford F150 Forum - Community of Ford Truck Fans
I'm still googling but it seems I need to start by cleaning out the lines and evap which I'm not sure where its located. I'm going to get on a creeper tomorrow morning and have a peek but just wanted to see if any of my brothers ( or sisters ) here have had this issue. I just turned 35K miles.
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When I park over night while in 4x4, the next morning my hubs are disengaged and I have to manually lock them. There is an apparent slow/slight leak in the vacuum system. What would be the usual suspect, so I can start at that point?
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I am thinking on installing a shutoff in the vacuum line that supplies the hubs so I can use 4LO for backing uphill with a trailer without having the hubs engage. Its either that or a switch to disable the PVH solenoid.
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I have an 04 F150 (4.6, auto, 4x4, SCrew) with 300,000 miles. Any success modifying existing 4X4 IWE actuators so they are always locked in?
My last set of actuators didn't last long My vacuum is too low under hard acceleration... Actuators partially engage leading to early failure.
I'd like to take an actuator apart, modify it so it's always locked in. Some loss of mileage? Other ramifications?
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Title says it all come to a stop, step on throttle nothing, let off and step on it again it goes, does some one have to be killed before Ford knows there's a problem, it's happened to me 3 or 4 times in the last month, dealer checked said there's no codes so nothing wrong. OK I forgot the good info 2014 eco screw 4X4.
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I am in the process of replacing the complete front end on my 02 CC 4x4. Im replacing the hubs the lockers all seals and spindle axles. complete brakes with power stop and stainless brake lines ......I am going to switch back to the original automatic lockers. I am curious if has a simplified one line for the vacuum routing from the pump to the hubs?
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I have a 2005 f350 with the power stroke I went through the hole vacuum system all new hubs, seals, vacuum actuator and fixed it all now I'm having the reverse problems everyone has my hubs are locked all the time as soon as I plug in the vacuum actuator the transfer case is still in 2wd and will switch 4x4 and work and disengage but the hubs are always in unless I unplug the actuator ...
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I recently picked up a '99 F250 Super Duty with the 6.8L V10 for a song.
The 4 wheel drive hubs are not working with the vacuum. If I use the manual lock on the hubs all is well. I ordered the Innova 31703 CarScan OBD2 + OBD1/ABS/SRS Scan Tool. It says it does Trans codes. I am hoping it will cover the 4 wheel drive too.
Maybe related, the heat is always on. Meaning I feel heat at my feet when the temp dial is cold and fan is off. I can't find the heater control valve to check the vacuum line.
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I have 2011 f150 5.0 with 38,000 miles and the throttle body seized up tight.
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I recently purchased a '13 FX4, i love the truck, the Ecoboost power is incrediable. Recently while passing someone it made a horrible grinding sound, the dealer advised that it was known turbo issue that should have been corrected before we took delivery of the truck. When we took it in the dealer called and said they have Ford corporate involed because when the truck reaches WFO the four wheel drive tries to engage. Said it might be soem sort of vacuum issue.
Specs : 2013 Ecoboost Screw FX4 short bed. No mods, 6500 miles.
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Resetting Throttle Response. I came across this video, bored and just playing around, and tried it on my 2013.......and it works! Turn the ignition key to the run position, then slowly press the accelerator pedal to the floor. Then let the pedal up fast, then turn the ignition off. Do this 3 times, and on the last time, also turn the ignition off. I was amazed that that the lagging pedal response was almost completely gone!
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