Ford 6.0L Power Stroke Diesel :: Vacuum Leak Under Dash?
Sep 25, 2015
I 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.
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Haven't found any other useful info on this, but local dealer says that's where my truck is leaking oil from, and since it's considered brakes not powertrain the repair won't be covered under warranty ...
Backstory goes : dropped my truck off at local dealer Thursday to repair an oil leak from near front main seal area of the engine discovered while inspecting to initiate a bumper-to-bumper warranty through Ford ESP- their platinum warranty. I figured with all the electronic widgets and non-powertrain stuffs on this beast I wouldn't mind paying for 3yrs/36k miles of trouble-free motoring, y'know?
Apparently it's the O-ring on the brake vacuum pump that's allowing engine oil to leak. I can't even find this thing, just looking for some further explanation. I'm keeping an open mind so far, I don't suspect the dealer's just trying to get one over on me, just trying to be good and educated before I go plunk down for the repair.
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In the past, I've had the common issues of vacuum leaks causing issues as evident from the defrost/ac and then finding busted vacuum lines. Changed out and everything fine for a few years. Now, i dont have 4wd but i dont have the tell tale vacuum leak signs. Also, even if i manually engage the hubs, still no 4wd.
I try to listen for the transfer case to engage when i switch from 2wd to 4wd, I think I hear it engaging, but to be honest the 7.3 makes so much racket Im not positive that Im hearing it, or at least not hearing it the way I "think" that i heard it in the past. I seem to recall a distinctive clunk when engaging, now its barely audible if at all. Now when I switch to 4-Low, there is the distinctive sound, and it does goes into low drive, just that its only 2wd-low, still no front wheel action.
I have never had any issues before other than the vacuum leaks, have never had reason to dig into the transfer case for any reason. The only time it has ever been touched was last summer when i had the BTS installed and all they did was remove and replace.
Do I finally need to either rebuild or replace my hubs? Is it possible not to have 4wd even with hubs manually engaged? Or is there an issue with the t-case? Or is there something else going on? I have access to a lift to attempt "driving" while all wheels off the ground, its just not mine and its a tight fit and a pain to get my truck on it.
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How to diagnose a vacuum leak without a vacuum leak diagnostic tool.
My ESOF won't engage, AC/heat blowers default to defrost - classic symptoms. And while we can leave without AC/heat, we really need the ability to engage 4x4 low, especially as we get higher into the Andes and the roads become rough.
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Checked all fuses in fuse box, any other fuses or relays. The pump works when I jump it with a 12volt battery, so I know its good!
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What this part it is? It sits over the alternator on the driver side and looks like a couple vacuum hoses plug into it. Mine is making a very loud buzzing noise.
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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 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?
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I have a 2004 E350 6.0 with a bad vacuum pump. I tried looking on Youtube for a video on replacing the pump but no luck. Looking for a video or instructions on replacing the pump? It looks fairly easy but you need to be a snake to gain access to the pump bolts.
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Brake booster failures on 2011 and newer F-250's? I purchased a 2011 last august and the mechanic at the dealer I purchased the truck from stated that he had replaced the vacuum pump, vacuum brake booster and brake master cylinder on the truck just before I bought it as they were bad. Since then I have had two factory Ford vacuum Boosters fail on me. That makes at least three new factory Ford booster assemblies in this truck within the last year. What could be causing the problem? The truck is out of warranty and I am at a loss as to what could be causing them problem. Too much vacuum? Luckily the last two boosters have failed while sitting in a drive through and at a stop light, otherwise I may have had trouble stopping.
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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?
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I have a 2013 6.7 and i cant seem to get my 4wd to work in auto position on hubs i think i have it narrowed down to the solonoid for it but cant seem to find location on it.
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Ive changed all relays underhood cause i could not find info on which relay is which, checked all fuses under dash. Checked to make sure up stream on 4x4 fuse position has power. And i checked for power at 2 wire on transcase no power at 2 wire, i am also finding no power at back of dashswitch.. Looking for a wiring diagram that shows complete esof schematic
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Stopped at the store, came out, started truck, ran for two seconds, shut off, hasn't run since,had no codes,or any other issues. I have checked all the fuses,breakers,main power supply off of passenger battery, still nothing. I have head and taillights, power points on dash, dome lights, chime for headlights. 79674 miles.
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I am looking for a source for switched power under the dash. I am going to wire up power to my TST507 TPMS but I would like to have switched power. I have a bundle of wires all capped off under there but no idea if any are switched power. I thought I would ask before trying to probe each and every one.
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Got a Decreased Power message across the dash info center today and was limited to only around 5lbs boost. I stopped and pulled the codes and here is what I found:
P054E - Fuel Quantity lower than expected
P1249
P1247
P0471 - Exhaust pressure sensor range/performance
P02D7 - Injector learning @ max
P0402 - EGR flow excessive detected
I dumped the trailer and limped home to change the fuel filters. I could only go 35mph on the flats and 10mph on any kind of up hill slope. I switched out the filters, purged the air, fired her up and cleared the codes, all seemed well. I backed out and went for a test lap around the neighborhood, as soon as I turned the corner and rolled on the throttle and reached 35 the message came back and the codes returned. I will be towing it in to the dealer tomorrow for diagnostics.
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I am having a heck of a time finding this coolant leak. It drips off the power steering pump. I replaced the upper radiator hose and the heater "y" hose that goes to the bottom of the Degas bottle. I recently replaced the lower radiator hose as well. So the truck runs normal. When the system is under pressure I do not see any leaks. But after the engine is completely cold it starts leaking a small puddle of coolant. Its appears to be coming from the power steering pump. But I am sure its something above or near it. This is on my 2005 Excursion with a 6.0. Can the water pump be going bad and leaking this direction. I would expect a water pump to leak straight down the middle of the engine. What to look for? The thermostat seal stays dry. but it has to be in that area. What is really messing with me is. When it is hot and pressured up It does not seem to leak. Only after it has been sitting for hours and cools off..........What the heck!
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2015 F350 6.7L, 43,000miles
My family and I were driving into West Virginia this morning when the reduced engine power message came up on the dash and the truck died. I coasted off to the side of the road as best I could and got out. Immediately I smell diesel fuel. I look under the truck and there is fuel all over the passengers side frame and when I keyed it back up fuel started spraying down by the right front wheel.
Pulled the fender liner back and saw a small rubber hose that looks like it came off of a tee fitting down by the egr components. I tried to get it back on but wasn't able to get it seated 100% and when I tried to restart it blew off again. Truck is completely stock and ran perfect right up until it died.
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I had my truck at the dealer a while back while it was still under warranty and I told them that it was leaking around the oil pan. It was bad enough to coat the pan in oil, but no drips on the floor. They claimed no issue and sent me home. Well now my warranty is up and it's dripping on my shop floor. It is weeping out around the bolt heads.
I'm going to call the dealer in the morning and see if they will work with me since I did have it in under warranty for this same issue.
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Crawled under the new to me 13 super duty last weekend to see this. Where it's coming from? Over tightened oil filter maybe? The filter in the picture is the new filter fyi. Old filter had a little oil on it. It's all the way across the back of the oil pan.
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2007 F350... I noticed I have a small power steering leak where the master cylinder bolts onto the hydroboost. Is there a o-ring or seal between the two? or do I have to replace the hydroboost? Been looking online for a schematic but can't seem to find one.
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