I have a 2004 F250 CCSB 6.0 diesel. The problem I'm having is that vacuum is bleeding off when the control is set to OFF or MAX A/C. I also have no vacuum at the MAX A/C level to close the heater valve. Looking for a vacuum schematic for an 03 or 04 truck with manual controls or how to know what the malfunction is?
View 2 RepliesI found out by accident that my vacuum pump is now running all the time. It's not the gray line to the heater valve and it's not the vacuum canister as I already checked the easy stuff. I need some direction where to start looking under the dash as I have never been under that part of my truck. Any common issues or where to look?
More information: The pump only runs all the time when the HVAC control is set to OFF or MAX AC.
I have recently developed a vacuum leak on my 2002 F-350 V-10 under the passenger side of the dash. It is only audible when I am accelerating moderately to heavily or when the truck downshifts going up a hill. None of the vehicles HVAC or ESOF functions seem to be affected by this leak from what I can tell, but it's rather annoying to listen to this loud sucking noise every time I hit the gas moderately hard such as climbing a hill or merging onto the freeway. I don't know how I could search for this leak since it only happens when I'm driving and accelerating and not at a stop. What might be going on or where I should begin my search?
View 2 RepliesLong story short, I have a small vacuum leak in the 4wd system. I disconnected the lines going to the hubs to prevent grinding them to pieces as they are brand new. This, of course lock the front hubs in and disengages the X-fer case in 2wd.
It is not engaging in 4wd unless I select it, so I don't imagine it hurting anything in the X-fer case or anything. Other than the extra rolling mass, is this okay to operate at until I resolve my vacuum issue, provided I close all openings and places for trash to get in?
I have a 2004 Ford Escape 3.0 V6 FWD, and the air conditioning has been blowing only to defrost for a few weeks now. After many searches online, most sources seem to agree it is a vacuum leak, as the selector switch is vacuum driven if you want anything except defrost. I popped the hood and within one minute I found one open vacuum line that looks like it has been worn in two.
The line in question goes from the vacuum canister towards the passenger side of the firewall, then goes to a T connector, then a line (the one that is broken) continues towards the heater core lines to where the break in the line is. I found a picture online of what it should look like, but I am having trouble accessing the line that goes through the firewall and behind the glove compartment. I am pretty sure this vacuum line continues through the firewall between the two heater lines, but after that I am stumped.
I popped the glove box down out of the way and I see two thin vacuum lines and a small metal "can" nearby. The black line goes from a fitting and into the A/C bundle, and the white line goes from the top of the metal canister and down into the same bundle. My main question is which line controls the AC selector, and how do I pass a replacement line through that part of the firewall to make a good connection, as it seems the break is at the firewall itself with no extra sticking out for me to connect to.
I tugged on the little hose on the back pass. side of the engine,(5.4),...
and I could hear the vacuum leak that is apparently causing the erratic idle, and PO171 & PO174 to come up.
I know this hose is hooked to the Charge motion Control Valve on the back of the manifold,..I can't imagine what it does, as it terminates with some kind of plug or check valve??? Haynes say's to remove the entire manifold to get to the CMCV.
I can see it with a mirror,. I am thinking maybe long needle nose from Harbor freight,...bend the tip short,..maybe be able to change it out?????
The dash brightness dimmer pot. The roller doesn't have much tactile feedback or resistance, so when I rolled it just beyond maximum brightness, the dash lights flickered and went out. [Of course this could also be a feature I'm not aware of... ] Fortunately, dash lights came back on when reducing from max. Best to just find a comfortable setting below max brightness and leave it alone. - IMHO.
View 14 RepliesMy transfer case will only pull vacuum to the hubs when floor shifter is in between 4 low and 4 high. as soon as the dash light comes on for low or high it looses vacuum. Is there a switch that tells it to pull vacuum? Any good breakdown of the transfer case?
View 6 RepliesI have an exhaust leak that has gotten worse and is quite loud now. I have been under the car and a mechanic just checked what he could without a lift and didn't find any leaks. Yesterday, I had it up on ramps and looked under and think the sound is coming from where a heat shield is. When I'm in the car the noise sounds like it's slightly in front of me.
View 3 RepliesMy ford's 4x4 will work if I manually lock in the hubs. If i use the auto option it will not engage. I can feel the rear end diff lock when I put it in 4-low so I know the switch is working. I think it is a vacuum actuated system. How to find the leak or diagnose the problem?
View 7 RepliesI know all about vacuum leaks and such causing this problem, and I tend to think that is my problem. But isn't the temp change dial also vacuum controlled (in my case of an 06 f250 6.0) by that valve near the oil fill tube on the passenger side? I ask because, while I am stuck on defrost i can change the temp of the air that comes out still, telling me there is enough vacuum in the system to at least control that.
I also know everyone talks about checking the ESOF system for cracked lines/leaks, but this shouldn't come in to play unless I have 4WD selected or if the EFOF solenoid is bad, right? I just got done tearing the top end of this engine apart, twice, for oil temp problems and am about done working on this POS!!!
I did this years ago in my 04 Mini Cooper, although there were no vacuum lines, just about a 30 wire wiring harness. simple enough, extended each wire 1 by 1 so it reached where i needed it to be for the new location.
How hard would this be to move it? i haven't even taken the control panel out of the dash yet, i will do that tomorrow and see what's back there, it's been a while since i removed one so i don't recall what the wires were like, if there were vacuum lines, etc.
Until tomorrow when i can look for myself, if there is enough slack in the entire harness/vacuum lines/etc to move it slightly up/down/left/right, but in the same general area? I don't really want to move it, but here's the reasoning. my Joying android double din head unit doesn't fit. it fits in the opening in the dash behind the bezel:
And I've trimmed the little "lips/tabs" on the bezel radio opening completely off, there's nothing else to trim, and the plastic trim around the face of the radio prevents it from sliding in flush with the bezel, so the face of the screen is parallel with the face of the a/c controls, like the stock radio is.
kind of hard to tell but if you look close where the sanding marks are, it's completely flat with the main part of the bezel. normal double din installs in 99-04's i believe you only have to trim either the top/bottom, or the side tabs depending on the unit/stereo installation kit/trim pieces, but usually double dins will fit after trimming these tabs. this android unit is slightly larger due to the plastic trim around the screen (not removable, it's part of the actual screen) so that's why i'm having a hard time.
The only thing i can think of is to completely remove that plastic "bar" that's right in between the radio and the a/c controls, the one that's sort of rounded on the front. if i remove that, the radio will fit, but then it will cut into the a/c controls. now i'm not sure if i can maybe trim more bezel off directly under the a/c (there's not much of the bezel left directly under it to even trim) and move the a/c down just enough to allow the radio to fit right above it....or do something more in depth, and relocate it completely, either somewhere else on the dash, maybe in my future full length custom console i plan to build to house a subwoofer or two, as well as cup holders etc....or, which i think would be my favorite but the most work, and probably not even worth it because i THINK there's vacuum lines on the controls, is to move it to the overhead console like the same exact control is mounted in my excursion (which controls the rear air). i think i even have a spare excursion console that i could use so it houses the controls like stock and looks 100% factory rather than fiber glassing etc...i'd really like that option, it'd give me more space in the bezel to mount my clarion 1/2 DIN equalizer near the radio (which i probably can't if i leave the a/c in the dash) and it would keep me from possibly putting the a/c in the console, that's a last resort for me i think.
This is sorta neat how they moved it, i'd assume there may be enough play in the harness to move it here without having the cut/extend anything? that's what this thread is for essentially, so i can find that out .. I also don't know if i want to even put the a/c there because I'm not 100% sure yet, but i may bring my console (at an angle/curve) all the way up to that point on the dash where my console build will meet the dash. Not sure if I'm going to stop it below that point and retain the stock pull out cup holders and little cubby, or just remove that completely and bring the console to the bottom of the actual bezel. Looking for any pics of the back of the a/c controls (again, 2004 f350, non digital controls, same as in that last picture above). As well as info on how to go about extending things if it's doable without being over the top work to complete it.
I have an Accel Gen vll EFI setup on a 59AB and plan on using a pressure regulator but it has a vacuum inlet fitting. I'm assuming it's to allow for more pressure on acceleration. When the vacum drops more fuel will be allowed into the fuel rail is my guess.
View 3 RepliesI have a 2005 Ford focus. I haven't even had it 8,000 miles. THREE times it has overheated, and I've had to replace over a gallon of coolant. The first two times, the cause was a leaky 'vacuum' cap. The third time it was a different cap that was leaking. This radiator has two (that I know of) unused ports on it. A 3/8" one on the top left, and a 5/8" one on the bottom left. They are capped off with little rubber vacuum caps, which are quite simple to replace. But, these things don't last long before they start to weather and crack and leak. I just replaced them after 2,000 miles (before they started to leak), and they're already cracked. But oddly, only on the OUTSIDE. Inside they're still smooth and unbroken.
I've asked for advice at auto parts stores, mechanics, and even at a radiator shop. They all say they've never heard anything like this before?! I just got some silicone vacuum caps which are specifically rated for high temps, but they're so thin I'm not sure I wanna install them.
Ok, I have capped off the vacuum lines to the front hubs and replaced the vacuum solenoid on the passenger inner fender. Still stuck on defrost. I know there are several options from this point what would be the next step after what I have just recently done. Going away on a ski trip and would like to have it working properly before I go.
View 14 RepliesSo I was was tired of trying to tune my Holley 650 and finally threw in the towel and got a 600 Edelbrock. When the holley was on there the engine had the slightest surge but I was never able to pin down a vacuum leak. The PCV valve made quite the racket while running.
Now the edelbrock is on there and no matter what I did I could not get the idle below 750 (4 speed truck). I checked the carb, manifold, hoses, and boosters and no vacuum leaks. I disconnected the PCV port at the carb and plugged it and it immediately stalled.
I went down to the local speed shop and got a new PCV grommet that has a small opening (restricting) and some foam filter material in it. Got home and popped it in and the idle dropped right down to a near stall. Adjusted the screw and she's running fine.
Now for the question. Did I fix the problem or just band aid it? Has anyone heard of having to restrict the PCV circuit?
My truck has a vacuum leak or something. it will not start no mater what i do until i take off the vacuum house that goes from the back of the throttle to the right side of the valve cover. and when it running if i put it back it stop.i have changed that vacuum hose and the connector on the valve cover. What is going on here?
View 10 RepliesI'm having a little bit of trouble finding the cause of a minor problem on my 06 Explorer with the 4.0 V6 engine. When the engine is running cold at idle, it runs a bit rough and idle speed is high as well. When fully warm, the engine runs and idles fine. I hooked up a scan tool and there are no pending or stored codes. The live data looks ok except the long term fuel trim which is at about +10% on both banks during idle, indicating a lean condition. Short term fuel is right around zero. The MAF and TPS values seem to respond fine when applying steady throttle.
So I assume there must be a fairly small vacuum leak somewhere that the PCM is able to compensate for since the long term is only at 10. I didn't see anything obviously wrong, the vacuum lines look fine along the passenger side near the firewall. I sprayed a bit of throttle cleaner along the hoses, intake manifold and gasket area, but could not spot any vacuum leaks. Any other common areas to check for leaks on the 4.0 V6? Perhaps there is something I am missing?
I popped a code this morning PO442 emission control evap [small leak]. Would this be a vacuum hose leak? I did both heads about a month ago. Any way to narrow down the troubleshooting on this problem?
View 6 RepliesIt has been since the 80's that I have attempted to do any work on a vehicle. How do I find a vacuum leak and where is my vacuum canister. I am assuming that it is a vacuum leak for anytime my engine has a load on it the air stops coming out of the dash vents and goes to the defrost vents. I have an 2000 F150 with the large engine with about 112,000 miles.
View 11 RepliesSearched several times over the winter. Finally tore each hose out one at a time and went carefully over it before returning or replacing.
Turned out to be the long formed semi flexible vac. hose that runs from the gas fumes purge tank control valve group to the throttle body across the top of the engine. Ripped it out, on one of the bends was a small crack all the way thru, apparently would open up wide when stressed and cause problems. Mainly on hill pulls or hard acceleration but not every time. NO hair left after this one.
Replaced, deleted the codes. Runs like a top.
Still amazed at how much power these 4.0L V6 OHV Fords have from low speed on an uphill on ramp drag race.
stirs the old hot rodder blood.