Ford Explorer 4.0L SOHC Rough Idle P0171 P0174 Lean Codes
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- Опубликовано: 4 июл 2024
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In this video I go over one of the most common causes for these two codes on this engine and luckily it is an easy fix!
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Thank you so much! My 2002 Explorer would not run on its own while idling and found the problem in less than a minute of having the hood up. My elbow was disconnected from the hard tube. Popped it back on and put a hose clamp on it for now. You're the best!
Well, You saved my ass again! 4 years ago I followed the 4 part video of timing chains in my 1998 Explorer 4.0 SOHC motor and its still going strong. Now I went back to your videos because I had the P0171 & P0174 codes. Been working on it for a week. Tried the relearn strategy, Still ran up and down. Watched your video and sure as shit that was the problem. Changed out the hose, Test drove it and no more racing engine or dying at a light. It was so bad that sometimes coming to a stop light the tranny would bang so hard. And yes I did do something stupid, I changed the IAC motor thinking that was the problem. Your the best!! Subscribed to you for 4+ years now!
I had a rough idle in my 2003 Explorer. One of my best friends, who is a certified Ford mechanic, pulled the codes and insisted that it had a cracked intake manifold. After checking the video, I located the rubber elbow and sure enough.. It was the exact same split. Since it was a Sunday and I am 2 hrs from a parts store... I cut a piece of washing machine hose and Voila!!!! Fixed!!! I then disconnected the battery for 15mins and the Check Engine light reset itself. Thank you very much.. All is good again!!!!
Nice thanks for letting us know!
Can you help me to find the number of the motor on the ford explorer 1993 i cant find this number localization, thanks for yours help
FordTechMakuloco i have a 96 4.0 acting the same way but im not finding it on the side you are in the vid is there a different set up also? I found something similar on the other side
Thank you Todd Picklyk, That was very helpful info, disconnect the battery for 15 minutes and it will clear the check engine light.
i am hearing the air ,why i havent gotten to it yet ,lol. ,reset the code pull neg ground off battery place a piece of cardboard under clamp to insulate from reconnection.using a wire w/alligator clips on both ends touch the ground cable to the hot cable and battery post 5 seconds.only way to erase memory according to one video .good video i havent gotten to the leak truck is gonna be fixed soon i am sure of it now cause i heard real air leak and my idle mostly is problem almost like gurgling
Changed out the valve gasket on my wife's 2008 Ford Fusion today. Did exactly what you said in your video, felt very confident. The job took me close to an hour. Took my time taking everything apart and cleaning/ inspecting. Waited for about 4 hours for the RTV to cure, then ran the engine to operating temp, found no leaks. Went for test drive and double checked the valve cover for leaks. Wonder how much a mechanic would charge me for this job! Excellent job on your video!
Thank you so very much, your advise enabled me to locate the elbow and find that it had completely detached from the engine, reconnected and idles perfectly.
i recently was into egr replacement and afterwards ive been hearing that air ,youre video is great now i know where to look .
OMG. I had gotten a diagnosis of intake manifold leak. I was prepared to just scrap my '03 Sport Trac. YAY! $120 fix from my shop and I'm back in business. THANK YOU!!
I Have this exact problem and been trying to fix it for a few months now. Thanks for the Great video
Did it work my friend?
Thank you. I had to clear 4 error codes so my GF's 01 Ford Explorer Sport would pass emissions and I did not notice this cracked tube when I was diagnosing the last two 0171/0174 error codes until I watched your video.
Great tip. I've had my '03 SportTrac since '05....Pretty decent and dependable vehicle. Replaced this a couple of years ago. You're exactly right, from my experience dealing with mine, really just small components fail from regular wear and tear. The most annoying things were the emergency fuel shut off, and that darn t-stat housing (X3), With regular maintenance the hard stuff been held at bay so I've been happy. My wife just bought a '14 Explorer 3.5 V6. We'll be lucky if it's any where near as good of a vehicle.
I own a 2008 fx4 4.0 ranger that I purchased about four months ago and im just trying to get as much information as I can about these motor, I'm a new subscriber, thank you for your helpful videos
More Explorer vids please. Trying to keep mine on the road it's a 94 Fort Explorer Eddie Bauer 4x4 4.0L it has 312,000 miles I love it and I learned a lot about motors
Is that thing still on the road?? You have the OHV or the Dohc like he does? I got a 97 ford explorer OHV and im at 366xxx km and just replaced the head gasket but now im getting engine too lean codes but im hoping its just my hoses or a broken o2 sensor
Lmao they don’t make ‘em anymore and Amazon doesn’t sell them. Just called Ford and it sells for $160 for the whole assembly. Found the rubber elbow at Napa for $30. This video helped a lot. Thanks dude.
Here is one on this problem that no one that I have watched covered. I had rough idle a PO171 code and stalling when put in gear, I check every sensor looked high and low for a vac leak watched over a dozen video and could not find my problem. everything checked out as good final we figure it out a clogged fuel filter was not allowing enough fuel to get to the engine a long day of pulling out our hair ended with the very simple and cheap fix of a new fuel filter. The one important lesson I learned was start with the basics and branch out from there.
Great channel, great tip. Thanks so much for the help you are providing to your viewers.
I have an '03 Sport Trac, My truck was wanting to die while sitting at idle for a long time. I came across your video, while searching for how to change the O2 sensors. I went and checked the elbow, and low and behold, the elbow had a split in it. The only thing I was hoping for in this video is showing the exact placement of the complete hose, removal and install. This video just saved me $300. Mechanic didn't even check the elbow, just went by the codes and insisted it was the O2 sensors.
Thank you for posting this. I have a 99 explorer sport I'm having some issues with currently
Your awesome man! You have helped me out countless times! Thanks for sharing the knowledge, it is much obliged.
Thank you very much for this info. I have a similar setup on my 2002 Ford Ranger XLT 4.0L. One design I don't like is how the PCV has to be mounted to at port at the end of the Left Valve Cover. A Mechanic had cracked that PCV mounting port off the valve cover and it cost me plenty to have that valve cover replaced.
So, for me that PCV can be very costly to changeout, if I have to change the valve cover too. I changed lots of PCV valve, but I don't want to change this one.
Thanks for taking the time to give us this FREE information.
mcnamee30 No problem.
OMG you just solved a problem for me that I have been looking for for about 4 months now. Although I am a female I know a little bit about cars just not enough and I've done everything but that! wow, I wish I would have found you sooner, I have found you now and yes I subscribed, thank you so much you was truly a godsend for me right now and thank you so much for the great detailed instructions, us women truly appreciate that!
ill try not to be long winded here but in a nut shell, every thing you stated regarding the codes, symptoms cause and repair were exactly what i found, so thank you,
+Aztec “Aztecblu” Blue Nice thanks!
Keep the vids coming
Great channel.
Well done
Rob
p0302 2001 ford explorer sport trac
Encountered this exact same problem on my cousin's C5 Corvette. Very similar design, and it collapsed in the same way. Idle was hunting and rough, stalling occasionally. Was hard to find because the intake tube opening is pretty close to the throttle body on those and it masked the sound. Replaced the broken elbow with a scrap length of fuel line I had in the shop as a temporary fix. That was about a year ago. Still running fine that way.
Do you think an imperfect valve cover gasket could cause the codes also? I know it needs to be replaced but I’m hoping the codes will go away after I change it.
Thank you for your videos, they are very helpful. Ok,,, 2 things here. 1st, this is slightly different info here. I have a Ford Explorer 1998 4.0, my PCV valve is way in the back of the engine. It took me a while to locate it. It's also very hard to get to it.
Also, Thank you Todd Picklyk, That was very helpful info, disconnect the battery for 15 minutes and it will clear the check engine light.
My 2003 Ranger 4.0 never had a rough idle just a sudden CEL for P0171 and P0174 lean codes. I checked my PCV elbows and didn't see any cracks or holes. I pulled the front elbow, the one in your video, and found a small hole on the underside. I replaced it with a elbow I had, cleaned the MAF and cleared the codes. I hope this fixes the issue.
Thank you for posting this. I was having a rough idle and noted the P0171 & P0174 lean codes, When I looked at the hose, I was surprised to see that it looks almost identical to your cracked hose. You have saved me some major headaches. Thank you.
Love the channel it's already saved me a butt load of money!! I'm not a huge Ford fan but seems I'm always stuck in one😫so this is really helping me out I'm having a code come up for 02 sensor bank 2 that I suspect is a bad cat or 🐈 🐈 🐈 I'm really wanting them deleted but don't want the bad sounding exhaust or codes still looking for a good cat delete video where everything turns out ok!!
You're the man thank you for this tip awesome channel love it and subscribed
I recently bought a 96 explorer. It appears as though I either don't have the same elbow or I am struggling to find it. My engine scavenges at warm idle and I believe I hear a faint hissing, it also is throwing a P0133 code. Tried spraying carb cleaner around the entire intake manifold and vacuum lines and didn't detect any change in idle. Any help or ideas would be great! Thanks.
Thank you Brian, With 2003 Sport Trac V6 4.0L what must I do to re-tune or adapt for flex-fuel...?? By "flex fuel" I mean using any combination of Gasoline, E10, E15, E30, E50, E85, or pure straight ethanol....{in a just pump and go fashion}.
Since or local stations now put in random amount of ethanol I never really know what I am running.. E85 might be E50 .. Pure Gasoline does not really exist at most stations in Missouri {due to government mandate to add ethanol/alcohol}.
great easy explanation of this repair... Question.. I have a 01 explorer 4.o sohc and I am getting a jumping tach needle. I can not find anyone who has a answer for it.. it will sit at idle then start bouncing around... Any clues?
Another reason it could be hunting for idle other then PVC or TPS or IAC on cold starts is the Timing chain tensioners, there are 2 of them an upper and lower..this was my case.
Hi. I have a 2000 Mercury mountianeer 4.0 soho engine. I have a pretty rough idle. No DTCs. Fuel trims are ok, long term is adding a little more than normal. I checked my pcv and it's not leaking. My PCv is in a different location than this video though. Any thing common with these? Sort of hunts. Only rough at idle. Minor contribution hits on most cylinders.
I have a 2008 Mercury Mountaineer and I just replaced the thermostat housing and the intake manifold gaskets. Now that it is all back together it I am having a very rough idle/misfire. I took the intake back off to investigate and there is now oil in my intake at one of my cylinders. Could this oil be caused by a manifold leak, which would be causing the misfire/very rough idle? Tricks on getting the intake manifold to seat well? thank you
My explorer does the idle up/down surge only in the winter, but not the summers... Would this be the problem? I'm not near it right now so I can't check it... but I was told it was the IAC also. Before I get parts and drive to it could you reply?
Great video...mine runs great when warm but a pig when gcold...and worse in winter
I have an 2001 ford explorer sport track 4.0 v6 I have replaced maf, idle control. It sits at idle then dies, check engine light on. I went and had it checked it said running to rich.
i have a 2001 explorer sport trac with lean codes. ive inspected the hose you mentioned and checked for loose hoses everything looks good. then i reset pcm and while at idle my fuel trims started at 0 but quickly went up to about 19 or 20. what else should i do
Great Video I have a 2000 Ford ranger 4.0 with it showing a P0171 lean condition bank one Check Lite... once every 300 or 600 miles .. The truck is running good... only one time it would not idle . Could it be a Fuel Pump going bad? Over all the truck is running great .
Have you ever replaced the fuel rail pressure sensor on this particular vehicle-in the video? I'm trying locate the sensor on my 2003 Sport Trac (4.0 OHV) but I can't find any videos covering my model year(2003). Any help is greatly appreciated---thanks.
I miss my OHV 4.0. 174,000 miles and still didn't have to do any repairs. Still ran like new, ran better than my cousins POS chevy s10 4.3 with 180k. White smoke, crusty oil residue, ran hot even with a good cooling system. Burnt oil too and started getting rod knock.
Better go back and get that 4.0😂
Brian do you have any explorer 4.0l v6 timing chain replacement video invoking removal of the engine to get to the rear cassette?
So I just got my check engine light for these codes on last night. And this morning I was looking around my engine and I realized the part that you showed me that had the hole in it was actually just disconnected from the tube so I reconnected it but my engine light still on?
I have a, 07 explorer, 4X4, 4.0L with just over 80,000 miles, that runs rough idle and dies after I have driven her for a while gotten her up to running temperature and shut her off, resting for 2 - 30 minutes and then try to restart her. I have changed my throttle body, MAF, intake manifold gaskets, (caused they leaked) and still have the same issue. Codes come up with a p1000, but that is no big deal, and had a B1676 error pop up, but I do not know if that has anything to do with the engine running rough, I have no idea. The only thing I can think of after this is spark and fuel. According to my scanner my fuel is now with in normal range, which leaves spark. I was thinking about changing out my ignition system, Spark plug wires and spark plugs.
What do you think.
hey this video helped me with a start to my problems. I have a 2001 ford explorer sport Im also throwing codes p0125, p01121 im having a hard time with these can you help!?
I have a 1999 for Explorer with the same P0171 and p0174 codes but my truck turn off while driving and then did not want to start. It popped a couple of times from the exhaust. Had it towed but when it was dropped off it turn back on with no problem. Do you think it could be a bigger issue than PCV?? Say fuel pump?
Thanks Brian your a good man!
When I startup my 1995 ford explorer it over idles like it idles almost to 2000 rpms and then it would go down and when I drive it over idles to what could be the problem?
Hey! Good evening. I have a 2002 explorer 4.0 with a new engine with no more than 4K miles on it and my rear timing chain has a bit of a noise, I’m wondering if I can get away with replacing that external tensioner. Not sure why my new engine would have any noises at such low miles.
Good man.. I love your videos.. Keep up the good work..
I have a 2002 Explorer with the same problem. I bought the PCV elbow tube {Motorcraft KCV190}. The other problem I am having is, I can't seem to located where it goes.
Great video, i got a ranger 4.0 and in park it won't rev over 3000 rpm, is that normal?
Thanks López.
Hey man I have this issue but I have the sohc 98 Ford Explorer 4.0l but my motor don't look like this one any clue were it is on mine because I have same codes and everything u are saying is what my truck is doing
I just searched 4.0 Ford got this video solved my problem.
I have the exact size motor in my Explorer, but its 2000 model. My oil pressure gauge is going haywire and there is some ticking in the motor. I love my truck. So I parked it. Do I need to just replace it..or is there a not too expensive resolution...??
Hey Brian, I am most likey off topic here, but I'd like to know how to get a good front end alignment, repair/replace child door locks and headlight alignment. was given 2000 explorer XLT. You could say a rolling dumpster, it was and still is in need of a lot of TLC. Yesterday the engine ran erratically, and died when wife drove to work. She thought it may have been overheated. She added 50/50 mix antifreeze and it appears to be ok. However, after viewing video, I will check that tomorrow. I am unable to drive, and apprehensively must ride in it to Dr.office. It seems squirrly on the road, one slight overcorrection scares me a bit, much like a willis army jeep. Is this because of the wheelbase being short or incorrect tire size? All 4 are the same, just smaller. Thanks for videos, and your time/expertise.
I have a 94 ford ranger rough idle problem replaced fuel pump filter and Pcv valve same issue Any suggestion on it new plug and wires also
Our '06 Explorer runs fine, but the CEL just came on. 2 weeks ago, the MAP sensor was replaced for a different code and now this popped up yesterday.
My fiance 99 exsplorer 4.0 has been fixed twice and still runs rough so any suggestions if I check the tube and it's not that. I've worked on cars years ago but not these often. I'll check the line soon and hope it's this since she's paid the guy over 300 already once a tune up and today 200
I have a 1999 ford explorer sport, does its spudders when you make a complete stop it will spudder here and there like it wants to turn of but doesn't the idle barely moves when it spudders , put it in park a leave it for a while like a minute and it tuns off byitself?
need your help. what is the piece called. on a 2004 Ford explorer. not the radiator but behind it. there are 2 hoses that connect to it. right above the drain plug of radiator. It's the one right behind the radiator, thank you.
Can you make one of the diferent SOHC 4.0 motor?? My motor has the other tipe of PCV tubes/lines
I just did a top end job on my '99 Explorer 4.0L SOHC (heads replaced, every gasket and o-ring, timing cassettes, tensioners, chains and sprockets, etc.) and now my brake booster is leaking vacuum. It's running rough at idle, but no codes. Whenever I disconnect the line running to the booster and put my finger over it, the engine continues to run rough. I did have 90 psi compression on #1 cylinder, but I believe it was a stuck ring. Compression is now around 150+, so I know it isn't that. I haven't checked the PCV yet, so I'm going to give that a shot next.
Any tips on what else can be causing that?
gotta 98 ranger 4.0 been babied and is mint 100k miles, I just started getting 171 174, checked pcv valve hose fine, I smoke tested , sprayed brake clean, and tried propane when cold and warm and no change to engine speed but short and long trim stay in 25% range when I take it and and give it gas long term dives to zero. Fuel pressure 65psi, new fuel filter
I dont want to change intake gaskets Unless I have sure reason to. Or is that the only option for vacuum leak in this engine, Maf reads fine, and so do O2 sensors, no exhaust leaks, what would you try next.Your the best on the net!
I have a 2008 ford ranger 4.0. , I'm replacing spark plugs with motorcraft plugs that originally were in. Is it recommended to provide anti seize compound on the plugs , if so what brand ?
what about on the later model with the electronic throttle?
can you find this leak if you spray carb cleaner .. wouldn't the make it change how it runs
hey buddy i got a 03 explorer... all sudden started to idle rough and died.. now when i start it ...just ideals rough and dies and or dont get much rpms out it when stepping on gas peddle
Thanks for all your helpful videos! I have a 2000 Explorer Eddie Bauer 4.0 SOHC would this be the same design and replacement part as the sport track? I clicked on your ebay link and it claims the elbow fits my vehicle but I just wanted to double check. Wasnt sure if the design was different in the prior gen 4.0 SOHC. Thank you again!
Richard Gawronski Yeah all the engines are the same so it should work.
hi i have a 87 bronco 2 with 40 psi fuel pressure and good spark. it starts then quickly dies what should i do? thanks
Would this be the cause for rough idle on a 4.0L 2010 Ford Ranger XLT?
I have a 1998 Explorer 4.0sohc and on cold starts the RPMs go up and down. This only happens for about 30sec and then stops. I checked the PCV, it looks fine. Any other ideas ?
Really enjoying your videos. Ive got a 2006 4.0 explorer with rough idle as well as when cruising at around 1400 to 1700 rpm the engine feels like it misses which is an annoying uneven ride and no problems when foot down on the gas. Could this be a vacuum issue??
Paul Seaman No once your at speed the vacuum leaks are null you have a secondary ignition fault causing the misfire.
I have a v6 05 mustang, is it possible this is where my coolant leak is coming from? It's hissing in the gap right in between the two rows of cylinders. I'd really appreciate a professional opinion seeing as I'm a broke college student who loves working on my car :)
i have 1995 ford explorer xlt it does crank just dont turn over when i spray into the exhaust where the air filter it starts up but will bog out wen u stop what is the problem cuz it wont start again even the cable had seemed to disconnect on the gas peddle and is jus laying there idk?????
Thanks for the information. Great video
trying to remove a 2004 Ford Explorer Engine 4.0L SOHC VIN E upper manifold. Do you have a video with that engine tutorial?
i have a ford explorer 2002 xls and out of nowhere stared shaking when im on a stopping idk could it be is there anything you can tell me to check cause feels like it wants to turn off the engine when the car is on a stop light or when its park
Is this common in Ford Rangers? I have 02 Ford Ranger Edge at 17000 miles. It idles rough and dies sometimes or won't start at all.
Hi I have 2006 Mercury Mountaineer, recently I am facing a problem with shifting of gears, loose /free shifting, and not engaging to the selected gear, some times gets engaged after a minute. Power train malfunction indicator shown in instrument cluster. could you suggest the real cause of this issue and how we can tackle it. thanks in advance.
I'll give mine a look. I have been finding a leak here, and a leak there. Its insane.
I have a 04 explorer with a 4.0 v6. Service engine soon codes are "p0171 bank 1 system too lean" and "p0174 bank 2 system too lean". I already replaced the two upstream O2 sensors and still have the codes. The motor idles fine and does not appear to be running rough at all. Before I got these two codes i did have an egr valve code and replaced the egr valve. That code has not come back since. Any suggestions?
Thanks in advance.
This exactly wat I fixed on my 03 but it’s still idling rough, any thoughts?
We have 2004 explorer 4.0 put NE timing chains in it now when u start it it has little bit of rough idle and no power can yall tell me what this is.
Awesome!
thank you for this!
Had this same thing on a 99 3.0 dohc taurus.
I have the same question, I have a rattle (sometimes) in my 04 explorer 4.0 but I think its the starter hanging up? Can sit for weeks and not do it so it can't be a tensioner leakdown.
iamherenotheretobe Yeah the rattle would be after sitting so you are wise to look elsewhere.
I have a 98 explore sport I ran it outta gas and now when I start it up it idle really low and dies all the time so I went and the codes Read and it was reading the po171 and po174 can you kinda walk me threw on how too fix it?
Ok, so, I've got 4.0 SOHC... 03 Explorer. I get a jerking idle... And a jerk or a buck (sometimes multiple) at sustained throttle. Acceleration is no problem, doesn't feel like its lagging so I'm leaning away from plugs... But its a sudden jerk and dip on the tach at idle, then resumes normally for a bit, then a jerk that only takes me down maaaybe 100rpm...
Weird thing is, No check engine light (dash bulb works, as it turns on when I turn my car on), and the engine wasn't throwing any codes.
Possible PCV? or o2 sensor throwing off air/fuel?
had a similar problem with my mercury mountaineer (basically same SUV as these explorer, just a luxury version)
I got a 2004 Ford Explorer white smoke come out under the manifold it’s over heating no leaks I change the water pump new housing and thermostat flush it bleed it it’s over heating help if u may
Is there a video on the actual replacement?
what's the name of the PVC part and is it possible to link a how to replace instructions
Thanks for the informative vid!
Where's the link to resting your PCM figured? You mentioned it be posted in the video description, only see part links : (
Thanks for the help buddy
Hey FTM does this apply to the 06 Explorer with the 4.0 as well? Having a random misfire on all of bank 2 and a bunch of other seemingly all related issues (02’s stuck rich/lean etc). Truck runs rough when pulling out from a stop or pulling up a hill but at a higher rpm/speed it’s running fairly well. Only 117k on the truck but this ones quite frustrating to track down for me.
Monkey Wrangler hey man my truck has the same issue. What did you do to fix yours ?
I've cleared my lean codes 171 and 174 using bluetooth OBDII scanner and Torque Android app. How do you reset the PCM computer you mentioned in the video so it relearns the fuel trims, etc? Thanks!
see my pcm reset video
Great tips. Question for you I had a 2010 F150 in my shop the other day with a p0130 and a P0150 I found it odd that I would get codes for both 02 sensors I was going to replace them but customer didn't want to spend over 500 bucks on 2 sensors, I read in a forum that there is a TSB for that truck and could take it to the dealer and download a update to make the ECM less sensitive, can you tell me if that's true? I called my local dealer and they wouldn't say, They told me to bring it in for a 90 doller diagnostic and programing is extra
JOHN HUFNAGEL Yes there is a pcm update that will likely be covered under emissions warranty for him for just this issue, have done many.