Ford 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 :: Loud Shrill Varies With Engine RPM - Gas Smell And Vacuum Line Leak
Recently I have been having a strong gas smell coming from my 1997 F150 Supercab 4.6L 2wd. It is not happening all of the time. I have also been hearing what sounds like a vacuum line leak. A loud shrill which varies with the engine rpm. This also does not happen all of the time.
View 1 RepliesFord 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 - 1997-2003 :: 2000 - Bogs Down / Running Rough And Shutters A Lot - Code P0171
I've got a 2000 f150 with a 5.4 and 135,000 miles. The other day it was driving fine then i stopped and got gas and after that it was boggy and running rough so i thought bad gas but i ran through that gas and got more at a different store. The cel came on i got it checked it was misfire cylinder 1 so i put new cop, spark plug, and injector. Unhooked the battery and then the light came back on so i ran the code and now im getting a p0171. I checked the pcv and sprayed around the intake and vacuum lines. I also checked the pcv hose and elbow in the back and i found nothing its a fairly new hose. So, it does run rough it shutters a lot.
View 2 RepliesFord F-150 - 1997-2003 :: Exhaust Leak Cause A P0171 Code / Idling Rough And Almost Stalling At Red Lights
It's been a long time since I have posted here mainly because my truck was wearing a bow tie for awhile. But my wife was nice enough to tell me the Bow Tie wearing truck was making a funny noise on New Years Day (seems a small drum corps took up residence in the oil pan). So anyhow now I am back in a real truck . My new to me 1998 F150 5.4 Liter ran fine until yesterday. It started idling rough and almost stalling at red lights. about halfway home the CEL light came on and is throwing a P0171 code.
So far I have checked for vacuum leaks including all the elbows on the PCV system' tried the spray test with a can of flammable break fluid and a can of starting fluid (man I love the smell of that stuff) could not find a leak. Cleaned the MAF sensor and the K&N air filter (not a fan of these) IAC seems to be working. Only thing I know that is leaking for sure is the driver side exhaust after the cat. But that is the wrong bank if I am correct on which bank is which.
So why only one bank running lean and why does it act like it is only firing on 4 cylinders?
Ford F-150 - 1997-2003 :: Vacuum Leak When Engine Is Under Load
It has been since the 80's that I have attempted to do any work on a vehicle. How do I find a vacuum leak and where is my vacuum canister. I am assuming that it is a vacuum leak for anytime my engine has a load on it the air stops coming out of the dash vents and goes to the defrost vents. I have an 2000 F150 with the large engine with about 112,000 miles.
View 11 RepliesFord F-150 - 1997-2003 :: 1998 - Air From Defrost Only - Vacuum Leak?
This has been on going for the past year. The blend works fine. Fan speed works correctly. The selection for ac, max ac, etc., will only allow air through defrost vents. Vacuum leak?
1998 4.6 auto super cab
Ford F-150 - 1997-2003 :: Vacuum Leak On PCV Hosing - P1131 Error Code
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?
View 13 RepliesFord F-150 - 1997-2003 :: Vacuum Leak - Error Codes Indicating Bad O2 Sensors
I am having problems with a 2003 Ford F 150 with a 4.2 L V6. The problem is that it is giving me code errors that would indicate bad O2 sensors. I replaced both the upper and lower O2 sensors, and still I get the same codes. I was told by the mechanic with the computer reader that this usually means a bad vacuum seal. He suggested looking for bad hoses, but did not offer much more than that. How to proceed?
View 2 RepliesFord F-150 - 1997-2003 :: 2001 - Truck Tries To Stall Almost Sounds Like Vacuum Leak And Really Bogs Down
So.... here's my issue. I have a 2001 supercrew 5.4 and runs great all day long, no problem starting or anything. After I have driven it for a while and turn the AC on it cools off very good then after about a 1/2hr. the truck tries to stall. It almost sounds like a vacuum leak and really bogs down. I can wait about 2hrs and then with the AC off the truck starts and drives like it should. I am steering to the IAC valve but would like to know if this is it.
View 9 RepliesFord F-150 - 1997-2003 :: Vacuum Leak / Bank 1 Is Slightly Higher Than Bank 2
I am in the process of trying to chase down a vacuum leak on my 2003 F150 with the 5.4. I have checked all lines and cannot find it. I decided to check the long term fuel trim and noticed that my bank 1 is slightly higher than bank 2 (screenshot attached). Is this enough to assume the leak is on the bank 1 side?
View 14 RepliesFord Excursion :: Vacuum Leak - AC Is Blowing Through Defrost And Pump Is Running Nonstop
Ok, I know I have a vaccum leak. I have manual hubs now and those lines are capped. The AC is blowing through the deforst and the pump is running non stop. I have replaced the vac pump a couple of years ago and it worked fine then. any other places to look?
View 1 RepliesFord F-150 - 1997-2003 :: Transmission Line Running Under The Radiator Has Started To Leak
The transmission line running under the radiator has started to leak. I took a piece of rubber trans. hose and buy passed the cooler. How much does the cooler support the trans. temperature. I don't tow with the truck. And for the most part drive it around 14 to 20 miles one way to work. Is this something I need to replace now or after the temperature hits the 80s.
View 5 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 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 :: CEL On With Two Codes - P0705 And P0171?
Ok, so this past week i towed my 72 f250 to IL from CA. 2100 Miles. 6100#s with the trailer. No problems at all. Got about 9 MPG too the whole way. Ok, so here is my problem now. As some of you may know, IL just got about a foot of snow. Its all slush at this point. I am living in the country right now so i drive thru alot of it. Ok, now you know the back story, today i drove the truck to my brothers house, put it in park and bam! check engine light came on. About a half hour later i drove it to AutoZone and had them check the codes. Here is what they pulled.
P0705
P0171
Need to know what to replace. I have to drive it back to CA in 4 days.
Ford 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?