Ford F-150 (2004-2008) :: Running Rough With Code P0171 - Engine Light Stays On?
I just started to have this problem yesterday. Engine light comes on and stays on. Engine shakes and truck won't go over 50 MPH. Autozone code checker came up with P0171.
Truck has about 95K miles and I had the spark plugs replaced at 75K miles.
Transmission was rebuilt at around that time also.
I only drove it to Autozone and back today to post the code and see what everyone's opinion is as to what's wrong.
Here's what the printout says : P0171 "Fuel Trim Bank One Condition"
Passat (B6) :: 2008 2.0T CEL With Code P0171
Car was purchased new and has been great (O2 sensor was replaced a few years ago and something to do with breather valves due to it making a high pitched scream when the turbo wasn't trying to kick in) for the past 80K miles. Got a Check Engine Light yesterday and took it to Autozone to have them pull the codes (I was really hoping it was the "Hey idiot, time for your 80k maintenance") and they found a P0170 Bank 1 Cylinder 1 Too Lean (by their version of reading it at least). Probable causes: MAF, Vacuum or O2 Sensor.
Nothing that seems immediately life threatening so off to work in the morning. I noticed that it was running a little rough at idle and at speed when coming off the gas. Plus it did the old 2 or 3 extra turns after shutting it off.
The Probable causes line up with what I'm reading so I'm planning to pull and clean the MAF sensor when I get home tonight. Next up is probably replacing O2 sensors from what I gather. Although If i have time tonight I may pull the airbox(?)/Engine cover off and eyeball every hose I can lay eyes on as well as the Air Filter, etc.
What am I missing? Does the rough running and running a second or 2 after shutting it off add anything to the potential diagnosis?
Ford - Focus :: 2008 - Engine Cranks But Hard Time Starting / Code P0171 - Low Fuel Pressure?
My Focus has 102,000 miles. It has thrown a p0171 code and I have been attempting to fix it. So far this is what I have done:Changed MAF, air filter, PCV Valve, plugs, Valve cover gaskets, Bank 1 O2 sensor and fuel filter. All new. I have cleaned the throttle body, fuel rail intake manifold. Cannot hear vacuum leaks and tested for leaks with carb cleaner.
Symptoms: engine cranks but has a hard time starting, usually on second try. When tank is about half full I get Rough acceleration, higher RPMs (doesn't change gear) and engine stalls on hard left turns. Idle gets rough at times but usually stabilizes at around 700 rpms.
At the beginning, #1 spark plug chamber had a lot of oil in it. It's been a few months and no oil after Valve cover gasket and PCV change. Tested coils and the plugs get a spark. Before I start messing with the fuel pump, am I missing something else that I can do?
Ford F-150 (2004-2008) :: 2006 V6 - Got Codes P0171 And P0302
I'm lost. Got P0171 and P0302 ... 2006 4.2 V6 5-speed 220K ... Got bad miss ...
Compression check was good.
Replaced plugs.
Replaced wires.
Replaced coil pack.
Cleaned MAF
Miss remains. What do I do next?
Ford F-150 (2004-2008) :: Got Codes P0174 / P0171 / P0345 And P0349?
My truck have 4 codes p0174 and p0171 system too lean bank 1 and bank 2, and p0345, p0349 camshaft position sensor bank 1 and bank 2.
View 3 RepliesFord F-150 (2004-2008) :: 4x4 Doesn't Engage - Codes P0171 And P0174 When Switch To 4LO
Just recently replaced the driver side 4wd actuator. When testing the system to see if it was working, I noticed that in 2wd everything seemed to be in order (wheel spun without the half shaft, no grinding noises on test drive, seemed good to go).
However, when I switched to 4hi, the dash light "4HI" would come on but the wheel still spun freely without the half shaft. When the truck was off, the wheel and half shaft spun together as they should when vacuum is released from the actuator. When I switched to 4lo, the dash light did not come on and the check engine light came on. Pulling codes revealed P0171 and P0174.
Could these codes be caused by a bad solenoid? Is the solenoid not switching the vacuum off and that's my issue? Are there other possibilities?
Ford F-150 (2004-2008) :: 2005 2WD - Misfire And Hard Jerk When Going Uphill - Codes P0300 And P0171
I have a 2005 F-150 5.4L 2WD 90K miles. I started getting a misfire and hard jerk when going uphill. No codes for a few days but misfire got a little worse and more jerking at full throttle acceleration or level throttle up a hill got codes p0300 and p0171. I replaced the fuel filter cleaned MAF and changed plugs Motorcraft plugs (none of them broke during replacement). Miss got worse. Missing at idle and no power 3K rmp to get to 40. Only code pulled was p0171. Replaced upstream O2 sensors and COPs. Will barely idle now. Dies when put in gear. Full throttle barely moves forward a few feet just sputters. Checked vacuum lines cannot find anything. Only code I get is P0171. Fuel injectors next? Or shop?
View 3 RepliesFord F-150 - 1997-2003 :: Got Code P0171?
I have a 2003 F150 4.2 with 155000 miles. What may be causing this?
View 6 RepliesFord - Explorer :: 2003 - CEL Came On - Got P0171 Code?
My Explorer CEL just came on today, when checked it only brought up a code P0171. I have read through a bunch of the post and it seems most people get two codes where as I only get one. Also most say their vehicles run rough, mine runs great, so I am at a loss as to what to check or replace first. There does seem to be a slight ping when under load.
View 7 RepliesFord F-150 - 1997-2003 :: SES Light Is On - Code P0171
The "service engine soon" light on my 2003 F150 Supercrew 4.6L (225k miles) just came on. The code it's throwing is P0171.
View 3 RepliesFord F-150 - 1997-2003 :: 1999 XLT 5.4L - Getting P0171 Code Only?
1999 xlt with 5.4 lt p0171 only. it started with what felt like a misfire or hesitation and rough idle. Extremely rough at 40-45 mph. but with no misfire codes just p0171 so all 8 coils and plugs and sparks replaced twice in one month. and still same code tested fuel pump pressure 28 psi.... removed clogged cats, still same code... new pcv valve and elbow.... checked for air leaks around intake and intake manifold and nothing.... cleaned mass air flow sensor...I can unplug any coil on bank 1 and it wont make a difference. But if I unplug any bank 2 coils and engine makes a difference.
View 2 RepliesFord F-150 - 1997-2003 :: Code P0171 - Fuel Pressure?
I am still battling a p0171 code on my 2000 f150 5.4. I checked the fuel pressure at idle it sits at 31. I remove the vacuum line off the regulator it goes to 41. When i give it throttle when in gear it will maintain at 30. And when I shut the vehicle off completely it will maintain 38. Just looking to see if this is correct numbers. I was trying to determine a weak fuel pump.
View 9 RepliesFord F-150 - 1997-2003 :: Throwing Code P0171 And P0174?
97 F150 4.6 200xxx on recent rebuild. My truck is throwing P0171 & P0174.
I think I tracked it down to leaky IAC and EGR gasket. I sprayed both with carb cleaner and the RPM's dropped.
My question is, wouldn't the RPM's rise instead of drop? I was under the impression that they would go up if the gaskets were leaking. Or did I use the wrong spray?
Ford F-150 - 1997-2003 :: Rough Start Then Dies - Code P0171
97 F150 4.6 Vin 6, 5-Speed Trans, 200,000mi, Rebuilt recently. I was on my way to get my truck smogged, but she threw a code, P0171. I read somewhere to clean the throttle body elbow, which I did (needed to do it anyway). After I had everything put back together, I start her, and it's rough and immediately dies. If I keep the RPM's at about 1.5k for a minute, then let off, the truck will run fine for about 30-45 seconds, then die again. I just replaced my IAC and the problem persists.
View 8 RepliesFord F-150 - 1997-2003 :: Code P0171 And P0174 - Vacuum Leak
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.
Ford F-150 - 1997-2003 :: 1998 4.6L - Misfire On Cylinder 6 / Code P0171 And P0174
P0306 (ok #6 missfire) with P0171 & P0174 --- Do I chase electrical or fuel or both. Afraid to assume anything but probably would normally address the misfire electrical first.... Don't want to go down that 'primrose path' if others have been there first!
View 4 RepliesFord Ranger / B-Series :: 2006 - Got Error Code P0171 - Rough Idle?
I have a 2006 Ford Ranger with the 3.0L v6. The check engine light came on and the code it is blowing is a P0171. It runs rough at idle or when I let off the accelerator and "fine" at speed.
The code told me to check/clean the MAF which I have done. Next on the list that I saw was the PCV valve. I disconnected the electrical to it and then disconnected the hose. Some oil poured out of it... not a lot but some... The valve still seems free, it clicks when I rotate/shake it and I can blow through it (I know, highly scientific). I can replace this (if I can find it, Napa and Advanced Auto don't have a part that looks like it...) but I'm wondering what else could be wrong.
Ford F-150 - 1997-2003 :: 2000 - Idling And Running Rough On Acceleration - P0171 Code?
My daughter returned from college with her 2000 f150 4.2 idling and running rough on acceleration. It is throwing a P0171 code only. I replaced the isolator bolts/plenum gaskets four years ago because of a P0171 & P0174 codes.
So far I have replaced the MAF, new PCV valve and elbow, checked all obvious lines for vacuum leaks (though I suspect a leak somewhere still). Also, a quick check of the plugs show some lean color/deposits on the drivers side only. Any thoughts or troubleshooting I should try next?
Ford F-150 (2009-2014) :: Intermittent Check Engine Light Due To Same Code Every Time - P0171
For the last few months my truck has been throwing an intermittent check engine light due to the same code every time - P0171. The dealer has allegedly checked everything and has given me the "We have done all we can do" speech. Lead tech even suggested that since today's fuels have alcohol in them, that a check engine light would be normal. The truck has been in the shop 3 times with no success or even remote possibility of what the problem could be.
The check engine light has since gone from intermittent to constant and comes back on after 5 drive cycles after clearing with an OBD2 scanner. Also, I'm now getting a P0174 code.
Personally, I think they're trying to blow me off because I'm a few months and about 2k miles away from being out of CPO warranty.
Truck is a 2013 F150 Super crew 2wd 5.0 with about 45k miles.