Ford F-150 - 1997-2003 :: P0401 Code - Vacuum Lines?
Jan 23, 2015
So here's the background. I recently bought this truck. It's a 97 Ford f150 4x4 4.6l 99w vin code. Anyway Driving it home got a p0401. No problem. I Applied vacuum from other vacuum source to EGR engine stalls. So to me passages are clean in the throttle body. I checked to verify and indeed passages are clean. No while doing so I noticed no vacuum was making its way to the dose valve thing. Strange.... So took the line that runs to the passenger fender to dose off and it was impossible to blow air through.
So I cut out the clogged section found solder in the line. I filled the gap I now created using some 5/32 vacuum line reconnected to test and to my anvil still not vacuum. So I disconnected it again. Went directly to where the yellow/orange dose vacuum line connects to at the passenger fender and to my surprise no vacuum there either. No my question is. Am i suppose to have constant vacuum to the dpse or I'm I just being an idiot. And two if I am suppose to when the vacuum line runs into the passange fender where does it go from there and could I have a major issue in my hands?
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I've had a 0401 code on my truck for the last two years. I've replaced the EGR valve and the dpfe sensor a couple of times, with fomoco parts. Ive also cleaned out the egr tube that comes off the exhaust manifold. In this time I also discovered a couple of vacuum leaks and replaced those. I changed the pcv valve, tried running 93 octane gas, and had a mechanic friend run a special smoke through the vacuum lines to find more leaks. Also put a brand new gas cap. I have an obd computer and cleared the code repeatedly but the light always returns.
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I have a 1997 4.2 and when i got it the big vacuum reservoir under the passenger fender had the lines broke off. Where these lines go or have a diagram...
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I got a question, what is after ac hose vacuum left side on a 10 th gen 4.2l engine bay by the firewall, to the right of the blue thing, right of that on that line their is a 2 end diameter rubber vacuum line? What is that called, I need a replacement.
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On my 98' f250 4.6L 4x4 .. My check engine keeps going off and on, I finally pulled the code and its the P0401. The truck pings and knocks now and than and idles a tiny bit rough sometimes but overall runs good and gets the same mpg it always gets.....is this a bad egr valve?
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My 2001 F-150 came up with this code and I changed the EGR valve cleared the code and it returned 15 miles later. The truck only has 30K miles and the warranty expired 24 May.
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Have a p0401 code which I need to diagnose and solve. However, I don't believe the symptoms are indicative of the EGR system. Its a 1999 4.6L auto approximately 200k miles. Truck runs fine until it warms up, and then occasionally it begins to act like its missing under load. steady state on the freeway it may have an occasional miss, but put a load on the motor and the miss becomes real bad. This doesn't seem to me to be symptomatic of a P0401 code, but I don't really understand the EGR system enough to be sure. Searching on the forums for other p0401 codes doesn't seem to have the same symptoms.
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Dreaded insufficient EGR flow. I've read I should clean the EGR ports.
I can't really find where these are? I took the throttle body off.
What I should do with this thing? I also get a hesitation on initial take off.
1999 F150 4.2 V6 ... 160k miles on it. Runs good otherwise.
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Has a P0401 code EGR unSufficient flow. Ive read several things that it could be, from a DPFE sensor to the EGR valve it's self our that the port going into the TB could be plugged. Truck drives fine does not have a miss or anything noticeable when driving other than the CEL, trucks a 4.6 with 200k on it. Forgot to mention it sometimes gets a P0455 code but i assumed that is gas cap. or could it be related?
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I have a p0401 generic exhaust gas recirculation flow insufficant detected code on my truck I was wondering what would be the first thing to check to get ride of this code? my truck hesitates from a stop while excelerating to several thousand rpm. should I try replacing the dpfe sensor? what does dpfe stand for? do they sell this sensor at oreilys or do you half to get this a the dealership?
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97 4.6.. So it would appear that I have the wild goose chase of codes. The major symptoms are rough idle and very poor performance. I started off by cleaning the egr valve and ports. Then I checked the egr valve itself and watched the valve open and close under a vacuum. I was suspecting the DPFE sensor but I wanted to trying something else first. I was under the Impression that if at idle you apply a vacuum to the egr valve it would cause the engine to "stumble and stall". I did this and there was no change in the way the engine was running. So now I'm lost as to where to go from here.
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Owned my 2001 Windstar almost 3 years and this is the first time the CEL has come on.
I just finished some big maintenance early last month. Trans fluid, engine oil, cabin filter, fuel filter, rear brakes, fuel injector cleaner additive.
While driving a short trip, a few blocks, we noticed the van shudder a little bit. I thought maybe something to do with the trans. It wasn't very noticeable but enough to cause the sensation of moving forward and back slightly. Sort of like experiencing a 4.5 earthquake that triggered 50 miles away while you are on top of a 4 story building. Enough to feel the sensation, but that's it.
Upon starting the car up again on our way home the CEL/MIL came on right away. Got home and ran my scan tool on it and here is what I got.
P0401 Exhaust Gas Recirculation Flow Insufficient Detected
Freeze frame data
Calculated Load: 32 %
Coolant Temperature: 178 F
Engine RPM: 1320 r/min
Fuel System Status Bank One: Closed Loop
Fuel System Status Bank Two: Not Reported
Long Term Fuel Trim Bank One: -1.56 %
Long Term Fuel Trim Bank Two: -0.78 %
Short Term Fuel Trim Bank One: -1.56 %
Short Term Fuel Trim Bank Two: -2.34 %
Vehicle Speed: 28 MPH
Could this be related to a vacuum issue? I had the top intake apart a year ago and the EGR ports seemed ok, maybe a little clogging.
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Ok, I have 1997 Ford Ranger, 4cyl, manual transmission, and more miles than I'd like to admit to.
Yesterday, I noticed that one of the vacuum lines was coming dangerously close to hitting the serpentine belt on the front of the engine. The clamp that normally holds the vacuum line in place rusted away a decade ago, so I decided to use some velcro ties to attach the line to the positive battery cable. I didn't twist or pull on the cable in any way and the vacuum line isn't applying any force to the cable.
I get in the truck a few hours later, hit the key and I get >click<, but nothing out of the starter. One click when the key is in the start position, nothing more (as opposed to click-click-click).
Not thinking about my repair earlier, I went down to Autozone and had them test the battery - 12.8V and 550CCA, no problem there.
So then, I thought well since the click is coming from the starter relay, maybe that's where the problem is. I read on another forum that sometimes the starter relay can be resurrected temporarily by hitting it with a hammer. Which I did. And it did work! Now the truck is starting up normally every time, but I'd like to replace whatever was bad.
My questions :
1. Did I prove anything by hitting the starter relay with a hammer and then starting the truck?
2. Should I still be looking at the battery cables?
3. Should I stop hitting random parts with a hammer and take this truck down to a real mechanic before I do serious damage?
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Time to replace the aging vacuum lines to the 4wd and probably anywhere I can find the old rubber stuff.
What is the size of the lines and are they mostly the same?
I'd like to order a roll so I can make ones like the front hubs longer, stuff like that.
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I had my fuel system cleaned by the dealership last weekend and I feel like I gained 50hp+ ... Now its throwing a P0171 about a week and a half later. My computer also listed P0174 under the pending codes or whatever the section was.
2003 F150 5.4L ... I cleaned the MAF sensor a couple weeks back which stopped a rough idle and I have put some 300+ miles on it since. about 200 miles since the fuel system cleaning.
I got home and popped the hood and it sounded like a vacuum cleaner. Guess it is a vacuum leak. I might need to stop using this ford house. I swear this is the second time there was a vacuum leak(I think, first time they said it was spark gap issue). I'll be heading back in the morning now.
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I'm getting the p1131 error on my 2000 xlt f150 5.4l. I know it's usually a vacuum leak on the pcv hosing, which I did have at the back and replaced as well as other softer joining sections(3 to be exact lol), but I'm still getting this error. Changed out my plugs and cops(as they needed it) and the back two plugs on both bank 1 and 2(plugs 4&8) were both white! Since this is an obvious indication of a lean burning cylinder can I make the assumption my most likely problem is dirty fuel injectors on those cylinders?
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My truck, the aforementioned 01 f150 5.4 has been running fine but has had the codes p0401 and p1740. I know what they both mean I just haven't fixed them yet. Today I went to move my truck and it wouldnt start. It turned over fine and would hit some but wouldn't start. Would the tcc solenoid be the cause of that? Also the reason my egr is throwing is because there is a line that is not connected but I have no clue where it connects to... Where is the best place to get diagrams for the egr system.
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This is what I have done I have 5.4 168,000 on motor . I have codes p0401 p0701 p0704 and some others .I can run truck for about 15min and it starts to lose power .I can't go over 1500 rpm . I have changed egr cleaned throttle body checked for vacum leaks changed the dpfe . new plugs . I have had a misfire code on number 1 but that code has stopped . I have put new fuel filter .I have a cheap scanner I use and it probably won't give me what I want also I changed down stream 02 sensors .
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My 97 F150 4.6 4x4 threw a P0302 and P0401 the other day, I traced the miss fire to a loose injector plug. I reset the codes last weekend, I got in the truck and went to the Dump and to town to pick some stuff up. It threw the EGR code again, so this morning I did a little checking on the EGR I cranked the truck and disconnected the FPR vacuum line and hooked it to the EGR valve and the truck died down but didn't completely die.
Now the green line that went to the EGR valve felt like it had a slight bit of pressure coming from it. Is this normal? I did pull the white feed line from the EGR Regulator and it had good vacuum.
The regulator also makes a humming sound when you cut the truck off. Ill be pulling the alternator this weekend due to it going out last night, while I'm in there if Ive got to pull the throttle body id rather do it while I'm elbow deep in it. So does it sound more like a Clogged Throttle body or a Faulty sensor?
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Blew a hole in the 3/16 inch line to the rear on the left frame rail, behind the gas tank. Lost all brake function.
Got the truck home and inspected. The line was rusted bad about 6 ft long from the connection at the rear hose to the axle, up to the rear seat area ( crew cab). From the drivers seat forward, the line looks very good. The line across the rear axle from left to right looks very good. I bought two 50 inch standard lines 3/16 inch. Started at the rear hose connection 6 inches behind the gas tank and ran forward to the rear seat area.
Cut about 32 inches of the other 51 inch line and connected and ran forward to below the front seat area. There is a metric connector at this point. I cut an inch in front of it to eliminate it. NAPA sells a high psi compression fitting ( steel , 10,000#) that you can connect two 3/16 inch lines together. I did that under the drivers foot area. I have done two different 2002 F150s in the last year due to this failure. Something to look into. Not nice to loose brakes in traffic.
If your worried about the steel compression fitting, don't. I have used these on several cars and trucks over the last 15 years. Make sure you get the STEEL high pressure compression fitting. Total line replaced on CREW cab, 51 + 32 inches. Pops right back into the original plastic clamps.... I might mention, that is where the failure was, under the plastic clamp at the rear end of the gas tank area.......... crud must collect on the clamp.
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I have a 1999 Ford F-150 4X4 w/4.6L V8 W code, I recently lost all brakes. The primary line from Master Cylinder to ABS Pump rusted out completely. Replaced them but the other lines from ABS Pump to wheels are looking real bad. So I need to replace them, however I have no idea what the routing system looks like. Looking for a 97-03 F-150 Brake Line Diagram? I live at the jersey shore... so yeah rust is extremely common.... unfortunately.Also, where to get line assemblies?
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