Ford F-150 - 1997-2003 :: 2002 F150 5.4 - CEL Came On For Code P0174 - Misfire On 7 Of 8 Cylinders
Mar 18, 2013
So the past few weeks my truck has been sputtering a lot. It seems to do it more so in low RPMS but when I lay on the throttle I didn't really notice it. I haven't had time to look into the issue but yesterday the issue got drastically worse and the CEL finally came on. Registered P0174 as well as a number of other codes including misfires on 7 of the 8 cylinders.
So far I have replaced the fuel filter. Spark plugs are only a few months old. I didnt think it would make sense for all of the coil packs to go out at once so I was thinking either a fuel issue or vacuum leak. Why would it only spit out P0174 (Banks 2) and not show P0171 (Banks 1) along with it? Fuel pump? Vacuum leak? Where should I start? 2002 F150 5.4L...
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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!
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Here is my situation : I have a F150 1999 4x4 ext cab with 326 000 km. A little while ago I got a P0401 code so I decide to clean the TB first and at the same time change plugs and wires since they were overdue. The same code came back and a misfire. Ordered EGR valve, DPFE sensor and selenoid. Realize that I had ordered crappy plugs by mistake. I change all plugs. Had to wait for the EGR valve and others to arrive. I drove the truck for a while since I did not have the time to change the valve and others, during that time the misfire did not come back. Yesterday I change the EGR and others. Today I get a truck that runs really rough and got new codes , P0305 and P0174. I'm really confused now on what should be my next step, should I change the coils, can a P0305 cause a P0174. Should I change vacuum hose going to the EGR , selenoid and DPFE.
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My 97 F-150 has 208,000 miles on the original engine. It started misfiring originally on just 2 cylinders, 1 and 8, after pulling the codes. I also get a P0420, catalyst system below threshhold bank code being thrown, but I think it is because of the misfires.
To remedy this I've done the following:
1. Spark plugs are relatively new and were changed completely a few months prior to issues.
2. Coil Packs were changed on both sides. Additionally, Cylinders 1 and 8 are on separate coil packs.
3. Spark Plug wires were changed
4. Did a resistance test on each fuel injector and they all passed.
None of this has worked. Am I missing something obvious? From my friends I've heard everything from my exhaust is plugged to I need to change all my injectors. Injectors are costly and I'm not even sure how to check if my exhaust is partially plugged, but it seemed to be flowing fine. Also, I pulled plug one since it was simple to get to and noticed it was slightly brown, like it had oil on it.
I got frustrated and continued driving my truck until the problem degenerated into severe misfiring and now I cannot get it started at all (Wrong move). I bought a car and haven't drove it since, and have it sitting behind my house. Now the cops want to tow it because the registration is has expired so I've decided to move it into my garage so I can work on it. Part of me wants to junk it, but I've put a lot of time, money, blood, sweat, tears, and curse words into this truck and am motivated to get it back up and running since the transmission and front suspension had been replaced recently.
What to do!?!?
1. Go to the Ford dealership and have them diagnose the issue and then try to fix it? (I have little confidence in them from the stories I've heard)
2. Pull the engine, tear it apart, and rebuild it?
3. Drop a used/rebuilt engine in?
4. Call me crazy and say junk the truck and buy a different one?
Currently leaning towards option 3...
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My truck was running fine the past few days minus a cylinder misfire and a lean code the misfire was due to a coil pack being out no big deal on that part but yesterday on 7/30/13 my temp gauge turned off my truck wouldn't go below 1k rpms and then the over heating light came on. i drove the one mile home and turned it off an hour later i went back out to my truck to get to work and it refused to start.
I decided to just hold my foot down on the gas and crank it and it eventually started drove it to work with the same symptoms. now today its doing the same thing except now the truck is broke down in the parking lot at my job the engine is flooding cause i can smell it last night i changed the thermostat. I can get so that i can get my truck up in running its a 2002 f150 5.4L 4x4....
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I started out with misfires in cylinders 1 and 7. Replaced all spark plugs (used autolites, i know i know). While replacing them I found that the boot on coil 8 was beat up with a chunk missing. It was working before I replaced plugs. After I changed everything out the 8th quit working completely and I still had a miss in cylinder 1.
Replaced coils on both of those and put a new wire connector on for 8th cylinder because it no longer clicked in correctly anymore. Truck runs infinitely better than it did prior to this, but according to OBD2 I still have misfires in 1 and 8.
Mostly in the 50-60mph range. What else could be causing this??? Injector maybe or is there some other sensor or timing problem? My dad has a compression test kit, but he lives several hours away so I can't just get to that right away.
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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?
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I was coasting down a steep hill yesterday when the CEL came on. I pulled the code this morning and got code P0174, system too lean bank 2.
I cleared the code. Should I just wait to see if it happens again? The truck is running great. There is no sign of a problem. BTW, it's 99 F150 5.4.
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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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My wife and I received her father's 2002 F150 4.2 5 speed 2 wheel drive truck after his passing. He purchased new plug wires and wanted to replace them. So, this weekend I put in new plugs, plug wires, changed the air filter, and changed the oil and filter. Started up and ran really rough. Threw my code reader on after taking it around the block and found the following codes...
P0316 Misfire detected in first 1000 revs,
P0302 Cylinder 2 misfire,
P0305 Cylinder 5 misfire,
P0306 Cylinder 6 misfire.
New plugs were Motorcraft plugs, but had skinnier center compared to the ones that came out of truck.
Where do I start? What do I do? I am really confused as I have changed plugs and wires before and always had vehicle run better or same as before change.
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Recently bought 98 f150 xlt 3 door 5speed 4x4 4.6l 230k miles for $1k was throwing misfire codes on 1,8,4,3 cylinders. Usually throws two cylinders at a time and never the same cylinders consecutively
Parts replaced:
coils...msd blaster
belden wire
motorcraft plugs...when i did these it ran perfect for a tank of fuel...18mpg no stumble
two cans seafoam through the tank
tank was dropped and drained
fuel filter
one can seafoam intake cleaner
3" exhaust from the Y pipe back
MAF cleaned
Previous owner said to have tested and cleaned injectors but I am not positive it was done... I don't think its mechanical because it wanders through the cylinders and when i changed the plugs it ran spot on. it gets worse the warmer the truck gets also.
injectors?
clogged small cats?
sensor?
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I have a 1999 F-150 with the 4.2L engine. I recently did a motor swap as the original motor was bad. I bought this truck as a project truck and have enjoyed working on it.
When I did the engine swap back in May of this year, it took a while to work out all the little bugs and quirps. However, after a while of running the truck it threw a few codes. I replaced a lot of the emission components and no more codes for several months until last month the truck started throwing the infamous P0174 "too lean bank two"... I have replaced the pcv valve and all the hoses to include the little rubber boot under the front of the intake, all 4 O2 sensors, MAF sensor, EGR, DPFE, IAC valve, new wires and plugs to include coil pack, fuel pressure regulator, and all the vacuum lines that are under the hood.
The truck runs fine, has power, but about every couple weeks or so it throws this P0174 code. I know there are alot of threads on here about this problem and I have read many of them. It only throws the P0174 and not the P0171. I am wondering if there could be a problem specific to "bank 2" that I am over looking.
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I have a 2001 F150 XLT Supercab,4.2lt, automatic, 2WD.
I was able to start it about a month or so ago but it was really hard to start. I had to use starting fluid to get it started, and it was still tough to get it to start, but once started and warmed up it ran fine.
Now I tried to start it again and it kicks over and wont start. I tried the same with the starting fluid and it almost starts and dies. I think I used a little too much starting fluid because after a while of trying and spraying starting fluid, I got a hard backfire that sounded like a shotgun that was strong enough to pop off the MAF Sensor and throw it about 10 feet. I nearly crapped my pants! It looks clean and undamaged but I hope I didn't damage the MAF Sensor when if hit the ground.
The truck sounds like its starving for fuel, so I'm not sure if the fuel pump relay is going or has gone bad, or if its the fuel pump. How to check these items without making it a huge project to diagnose?
Once I can get it to start easily, I have a couple of questions about the trouble code that keeps coming back P0174. That was the original problem with it before the starting problem.The diagnostic says that it is lean in bank 2 but a mechanic friend of mine said something about a vacuum leak.
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2002 F150 - 5.4 ... So just bought this truck about a month an a half ago. No problems but the other day the SES came on. It is showing P0171 and P0174. And P0000 (almost forgot that one) was told that's generic though. Haven't really noticed a difference in the way it's running. Has been extremely cold here in WV but the only thing I can notice (or think I notice) is the gas mileage has gone down a little. After reading some on this forum I'm looking for a vacuum leak correct?
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I am at about my wits end with this P0301 (Misfire On Cylinder #1) code on my 2003 Ford F150 4.6L. I've replaced the coil pack on that cylinder, all the spark plugs, and replaced the fuel injector on that cylinder. We keep clearing the code and it keeps on coming back.
The weird thing is that it only misfires after the truck has set for a few hours and then it only misfires when I first put it in gear. Once I am out of the driveway and on the road it's fine for most of the day unless I let it sit for several hours and then it might misfire again.
We noticed that the connector to the fuel injector is wobbly and doesn't snap tight to the fuel injector (before and after it was replaced) due to the clips on the side not working well. We zip tied it together this afternoon to make it fit tightly to the fuel injector to see if that works.
What could be causing this? Other than that misfire the engine sounds great and the trucks runs very well.
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My aunt recently gave me her 02 f150 for free because it got flooded and she didnt want to fool with it. she said it ran great before it got flooded. I flushed everything. oil, gas, and tranny. I blew water out the cylinders and replaced the spark plugs. I took the fuel injectors out and cleaned and cycled some b12 threw them. The truck starts and gets spark to every cylinder and is only running on 3. I can pull 3 plug wires off and the idle does not change. Idk what it could be but dead cylinders. I am afraid I am going to have to find a new engine. I am going to do a compression check later this week when I have time. I am new to fords so if there is anything I should check...
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Was looking for some advice on what my problem may be. I just replaced the slave cylinder on my 02 f150 4.2 and two days after I changed it on my way home from work my truck jerked when I was about to turn into my driveway. Then when I stopped I put it in neutral snd it started rattling really bad it stopped when I pushed the clutch in And when i let out it started again. It sounds really bad and im hoping its something I can fix my self and not terminal.
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I have a 03 F150 with a bi-fuel 5.4 engine an it has 195000 miles. I have had trouble for some time now with misfires. I bought the truck in october of 2011 with 125000 miles and replaced all the coils and spark plugs because it was misfiring badly will running on CNG. It was fine on gasoline and never had any codes. After I replaced the plugs and coils it ran fine on CNG and gasoline.
This summer 2013 it began missing badly at highway speeds only when running on CNG. If I accelerated the miss would go away until I was light on the throttle again.I checked the misfire count and found the bad cylinder and replaced a coil. Then a day later same thing on another cylinder. I swapped a coil from another cylinder and problem went away for a day. Eventually I chased the misfire around all the cylinders on the engine until I had ended up either replacing a spark plug or swapping a coil on all the cylinders. And I still had a misfire. It seemed to be worse on days with temperatures above 90 degrees. Eventually I got it to stop misfiring.
So now 5 months later I am back again with a misfire. This time it is misfiring on both gasoline and CNG and under any throttle conditions, except coasting. I have no codes. And the misfire monitor is sending me around the engine again. I have replaced a spark plug in two cylinders and swapped 4 coils.
I'm ready to buy all new coils, but I want to be sure that it is not a waste of money since the old ones only have 70000 miles on them.
Two days ago I had the misfire monitor saying #4 in the evening and the next day without me having done any work on it it was saying #6. Later that same day it said #7 and I still hadn't done anything other than drive the truck.
I checked the connections at the firewall on the drivers side with the three large plugs that are held in with a 10mm bolt, they looked fine, no corrosion or burnt pins. I checked the connection at the ACFM which also looks good. I will check the connection at the PCM in the next day or so.
Some other problems that may be contributing:
1. I occasionally get a U1262 code (scp fault)
2. Sometimes when I check the misfire monitor it only shows 7 cylinders, sometime 9 cylinders. I am using an Innova 3160 scanner.
3. I have either a leaking valve cover gasket or leaking head gasket, because I have oil dripping from the rear bottom corner of the passenger side cylinder head right above the exhaust pipe.
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I have a 2002 f150 5.4L 4x4 7700 and she was misfiring bad the other day I changed coil pack 1 and 4 because that's what my codes where reading and i changed all of my spark plugs just because the check engine light went away for a little over a day and boy was she running good she had a little hiccup with a misfire but it quickly fixed itself but later now my check engine light is back on and is miss firing again and this time it isnt fixing itself what is going on with my truck?
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So my 99 F-150, 4.2L started throwing a code a few weeks ago, P0306 #6 Cyl Misfire. This thing has got 238,000 and has been the most reliable commute vehicle I've owned.
Today I changed all the plugs and wires (they were due anyways) which didn't resolve the issue. After clearing the code, got about 3 miles out and it came back. Running SeaFoam through the system on this tank as well, but I'm leaning towards an EGR blockage like what is described here:
Sparky's Answers: 1999 Ford F150, P0306 Misfire Cylinder #6
I was about to buy a new coil pack but I'd rather not continue to throw parts at this, as I've read many others do with this same exact situation, only to end up with the same code. I've replaced the coil pack once already a few years ago when I lost a cylinder on the way to work.
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My 97 F150 through a CEL Tuesday night P0301 so I picked up a new plug because it's cheap and simple, but that didn't do anything. Spark plug wires are about 3 months old, I also swapped injectors between 1 and 2, and misfire stayed with cylinder 1. It also gained a tap when the misfire started but only above idle, but it doesn't sound like a rod knock.
I also noticed if you unplug injector 1at idle it taps/knocks 3 or 4 times, however if you unplug any of the others it doesn't do that. I checked and I definitely have good spark from the plug. I plan on picking up a new compression tester tomorrow since mine never was returned. If you take the oil fill cap off it doesn't have any blow by at idle, however if you rev it you get a quick cloud out of it.
I thought about picking up a kit to check the injector pulse.
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