Ford F-150 - 1997-2003 :: P0401 OBD2 Code / Vacuum Leaks
Sep 6, 2009
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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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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Question. I have never used propane to find vacuum leaks. I always use starter fluid. I understand propane is better but how nuch do you use? Low volume, or a lot of propane. I just don't want to kill myself.
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corrected vaccum leak. Still high idle and obd2 code 1506???
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Where to decipher engine codes? I pulled a P0001 Fuel Volume Regulator Control Circuit Open code .
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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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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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I just picked up a 99 F150 for a song because it has an issue with the PATS system and the po doesn't have a clue on what to do with it. I bought a new ignition cylinder and Auto Enginuity to program the PATS. The problem I'm having is that I'm not getting anything from the OBD2 port and the #3 fuse is good. What else would cause the port not to have signal?
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My 03 5.4 the obd2 port isnt working i have tried 4 bluetooth adapters and a snap on scanner and nothing will connect to the ecm. im having problems and trying to read codes my check engine light isnt on but that don't mean anything. my truck is running really rich and blows a little bit black smoke when i rev it up after its been idling a few min and getting horrible gas mileage again. yesterday i went to start it and i had to crank on it 4 time before it finally started and then when i reved it up it almost died on the way back down but it caught itself. then today i go out and it starts right up and runs fine but its still running rich but i still cant get an obd2 adapter to connect to the ecm. I checked the fuse and its not blown my cigarette plug and the power port both work. i really dont know where to start in trying to figure out this problem. Right now iI don't really want to take it to a shop right now.
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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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I just bought a 2003 F250 from a used dealer. Unfortunately the service engine light keeps popping on and putting out the code P0401, I have replaced the EGR, cleaned the inside, and cleared the code. However it continues to keep popping up and then it will turn off after a couple of days. I mostly drive in the city and the code generally only pops on when I drive on the highway. I have also noticed a lack or delay of power, when I really hit it hard, I think its because the computer is keeping the egr valve open. What it could be?
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