Ford F-150 (2004-2008) :: Code PO306 Which Is Misfire On Cylinder 6
Dec 10, 2011
I have a 2004 f150 with the 5.4 and was wondering what would cause a spark plug to do this. Its on cylinder 6 and i have pulled the codes off of the truck before and one was PO306 which is misfire and can't remember other one but it was saying system was too rich. I have only has this spark plug in maybe 500 miles. but was getting a misfire code before that. Do you think it could be a coil or the injector?
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I have a 08 E250 4.6 getting code po306 misfire #6.. What should I check or change first and where is # 6 looking from the front of truck looking at the seats the driver's seat on my right # 1 is where and #6 is where oh 57,342 miles...
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I know there is a tun of info on the spark plug problem on the f-150. Here is the problem I have and I don't know where else to look.
Cylinder #3 misfires
1. swapped coil with #2 cylinder and still throws #3 misfire code.
2. Changed the plug on #3 and still the same code #3 misfire.
Where to look next?
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This happened xmas shopping with the wife. Started misfiring on the highway,took the 1st exit to find a garage as I am 20kms from home. The vibrations were worse at stop, but made it to a garage. They gave me the p0301 misfire cylinder 1, said they don't touch 5.4 plugs, told me to go to ford 2kms down the road. NICE. 4 in the pm, FORD dealer worse case scenario. Nope gave me a loaner told me come back at 930am. Truck was just waiting for an injector when I arrived. Plug & coil were good injector was shot,changed the fuel filter & oil change.
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Having a misfire problem I can't track down. First issue was random cylinder 8 misfire code. Checked everything, nothing obvious. Cleared code, problem stopped and engine ran fine. Then came back, cylinder 8 misfire. Swapped coil with #5 but problem did not return. Since I assumed it would come back, I went ahead and bought Accell supercoils and new Motorcraft plugs and replaced them all (120k miles, no broken plugs ). Truck ran great on the test drive! Then it sits overnight and bam, cylinder 5 misfire as soon as I start it next morning. Then after messing with it I get cylinder 5 bad coil (code 355 I think). Put one of the Ford factory coils back back on #5, no change and still misfiring. New plug, new coil on all cylinders... Why did it move from #8 to #5? If it was an in injector, seems it would still be #8 since I did not mess with those.
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Started as I was warming up the truck,a slight vibration/shudder. First thing that came to mind was F150. Torqued words of wisdom that it might come back, I had a p0301 before. Had no CEL, so decided to drive it to see if it got worse. Turned onto the main road and on came the CEL. Pulled into my FORD dealer, told him about my problem. Code P0308 misfire on #8cylinder was the read out, COP was done and the plug. 40 min of labor. She's even quieter than when #1 got changed.
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I have a 2006 F150 with a cylinder #1 misfire only code p0301. I have done new spark plugs, new coil packs, and new fuel injector on cylinder #1 with no luck. What to do next?
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Having 3 new codes coming up. P0306-misfire on cylinder 6, p0158, p2272. Use my truck as a daily driver for work. Driving along before 80km/h is not to bad but can still feel a little loss of power. If i step down on gas the truck has no power and sounds like maybe cat converter is plugged. If truck is pushed to limit she will make it to her 4000 rpm and will change her gears. So i'm just glad its not tranny.
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06 F150 fx4 has cly 7 miss fire cly 6 has oil on plug .Check engine light comes on only if you step into the gas, The oil was low. If you drive normal the check engine light does not come on, but you can fill the miss when in gear. Change the plugs an coil add oil still no change.
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2004 F150 XLT 5.4l (3v)... Problem started with misfire on No.4 and then I went through the tedious job of changing every plug (all 8 broke) and coils in an attempt to resolve the problem. After the changes I had misfire on no.1 and no.2, so I changed the injector on no.2 and coil on no.1 again + had broken pigtail wires on No.4 and No.1. Now I remain with a P0301 misfire on No.1. The problem won't go away, its fine idling, but misses bad when driving. The Snapon scanner reads fine for all injectors and compression reads ok also. The mechanics are baffled and what else could it be? (rail? computer? intake gasket?)
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I have a 2008 Hyundai Accent that is giving me one heck of a headache. I keep getting a code for number 1 cylinder misfire. When you start it up it runs fine for a while then the CEL will flash and it will start running rough. As soon as I shut it off and restart it, it runs fine. I even experimented with it this morning on the way to work. It started running rough doing 60, I put it in neutral, turned the car off and then right back on, put it back in gear. It ran fine the rest of the way to work. I have swapped coil packs, fuel injectors, spark plugs, and have even hang tested another ECM. Still number 1 cylinder misfire.
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My boss drives an '08 F-150 with a 5.4. The other week he had a horrid shuddering issue, misfire, and some known transmission issues so he took it to a shop. Supposedly the heads were pulled, heli-coiled, #7 coil was replaced, new plugs, trans rebuilt...a whole laundry list of stuff was done. He comes to me with complaints of a shudder in OD in low RPM primarily and a flashing check engine light with a #7 misfire code. I popped the hood to find no coil had been replaced (mechanics around here are REAL sketchy) so I told him to change up a new coil and I would throw it on to see if that fixes the issue.
Other than that, smooth idle and decent power with no shuddering except once in a while just coming into OD in low RPM...so around 40~ish and not throttling it hard. If he gets into it and blasts through the gears it has no shudder. I said the miss could be the whole issue, starting with the plugs and known misfire coil (#7) would be a good place to start.
A quick inspection in ~10 degree snow showed me the heads do not look like they were removed. The mechanic steam cleaned the engine, so looking for smudgy prints won't work. I know on older Fords the head gaskets stick out a little past the heads...do they on these too? He is questioning if the engine was even touched, and rightfully so in my opinion. Pulling the plugs would be the next step, but I need heat and tools for that.
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I sea Foamed the truck today. I will be pulling my heads most likely and am doing a few things beforehand just in case. History: low compression and misfire on #2. Have changed plugs and swapped out cops. Paper against exhaust pipe sucks in and pops against the pipe intermittently. Seems like intake valve.
Anyways, poured in a whole damn bottle through the brake vacuum line. The engine sputtered a bit but never stalled. I saw almost no smoke after a whole bottle!! I thought with 156000 miles it would smoke like mad. I have taken very good care of this truck and changed oil every 3 to 5 with synthetic 5-20 since new. Could it be that clean???
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2004 Ford F150 5.4 Triton 3V Vin5.....
How this started, Drove through a lot of water as our City was in a flood on my way home and and the truck started running rough and got worse over time, I can now barely get to 40 mph as it starts to ping and sputter with no power.. the truck has been parked and not driven while in the shape it's in.
The truck keeps giving me error code P0303 Cylinder 3 misfire detected, P0174 System too lean (Bank 2) and at times another error P0300 saying multiple cylinder misfires detected.
After clearing the codes, I got new codes stating Misfire on Cylinder 2, 3, 4, 6. System too rich (Bank 1) System too lean (Bank 2)
Cleared the codes again and I'm back to Cylinder 3 misfire and System too lean (Bank 2)
What I have done so far... All repairs with in a few days...
1. Changed all spark plugs.
2. Changed all Coil Packs.
3. Changed number 3 fuel Injector.
4. Changed the Oil and Filter. (no water in the oil)
5. Changed the MAP Sensor.
6. Changed Bank 2 O2 Sensor 1 and 2.
7. Loosen the Catalytic Converter on the drivers side to re-leave back pressure thinking the Cat was plugged, still loss of power. I also drilled a small hole in the exhaust at my lowest point to see if it had water in it and it does not.
Checked for vacuum leaks using starting fluid around the intake manifold, no change in idle.. I also checked to make sure the vacuum line was still connected on the back of the intake manifold, I have found nothing leaking.
I also had cleaned the throttle body and changed the throttle position sensor.
Repairs within the last 6 months or less...
8. Replace passenger side cat.
9. Replaced both Bank 1 OS Sensors
9. Replaced Timing chains, Gears, Guides, Guide Tensioners, Oil Pump and pickup tube, Water Pump.
Cam Phasers are fine.
And number 3 coil is getting spark I changed the Ignition Coil again thinking maybe another bad pack.
Still #3 misfire and System too lean (Bank 2).
I am at a loss and not sure what to try, except for a compression test on cylinder 3 but I honestly don't think it's compression or a burnt valve.
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I am getting cylinder 2 misfire and lean fuel bank 1. change the coil and didnt fix the misfire.
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i just picked up an 06 f150 with 5.4l 4x4 xlt package. Love the truck as it is my 1st Ford HOWEVER..... the truck is running super rough at idle and keep getting code for cylinder 5 misfire and bank 2 lean (which i am assuming is from cyl 5). here is what i have done so far...
New Coil packs
New spark plugs
New fuel module
New fuel injector on cyl 5
Still has a "stumble" when accelerating around 45 mph and shows code for cyl 5 misfire then will then throw code for bank 2 lean.
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We've got a 2006 F150 with a 5.4 in it. One of the new kids was told to change the spark plugs, then when I went to start the truck the next day it was missing bad. Plugged in the Ford IDS, number 7 cylinder is dead. Only codes are for that cylinder misfire, and random miss on startup. So, I double checked the kids work and it was all fine. Tried putting a new plug in, didn't work. Moved the coil to a different cylinder to see if the miss would jump, stayed on number 7.
Used a noid light to verify COP harness was working, and it was. Put a new coil on it anyway since I had one, still missing. Used noid light to verify signal going to injector for the cylinder. Signal was good, replaced the injector for the cylinder. Still misfiring. Ran a compression test and the cylinder has good compression. The threads for the plug are fine, not cross threaded or torn out. The only thing I can think is that the PCM has gone bad in a way that its firing the injector/COP, but doing so at the wrong time some how.
Every other cylinder is running fine, O2 sensors fine. PCM isn't trimming anything back to account for anything, and if it was it would do it to multiple cylinders to keep the engine balanced. Cant think of any more tests, and I don't believe there is anyway that the airflow could be restricted to only 1 cylinder, but I could be wrong. Wanna try and solve this to keep from sending it to the dealer.
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I have a 2005 f150 with 96,000 miles. Long story short, last August I was headed to the mountains going up a steep long hill and the engine light come on. once i was over the pass the light went off. During my 4 wheelin' trip it never came back on until I was headed home and going over another pass and then it stayed on for a couple of days. I had it checked and it was a cylinder 5 misfire. I did some research and found that replacing the coil cover might fix the problem and if not the spark plugs would need to be changed.
I changed the coil cover, problems solved... until I headed to the mountains. light came on and then eventually went off later that day. I didnt think much of it. then a few months later i was headed to the mountains again and the light came on in the same place on the steep incline hill. I. took it back to the shop, same reading. I decided it was time to replace the spark plugs anyways so I would invest. I have new plugs and everything is good however, I had no plans to go to the mountains in the near future. Now, a few months later I headed to the mountains and crossed my fingers it would not come on but it did.
I've done the research again and it seemed like the coil cover and spark plugs are usually the cause of the problem...however I have changed mine. The light is now off again. I don't understand what is triggering the problem and what is really happening and if it is safe to keep taking to the mountains with this happening. I did notice that everything was fine at 60MPH but once i hit the hill and steeped on the gas to go 65 and hit 4-5RMP that is when the check engine light came on...
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I am getting a cylinder 5 misfire and this has been a "on again off again" situation since last August. I took it around to a few places and the general solution was to get new spark plugs. After doing a bit more research I was advised to change the coil cover. I did that and it fixed the problem. Then about 4 months later the light came on again. I happened to change the air filter and the light went off. I though great, problem solved! not so much, when i went to the mountains the other day the light came back on. I did my research again and I have decided to get the plugs changed. Its a 2005 f150 with 94,500 miles on it.
I am told its time to change them regardless. I started calling around and getting quotes and have been told by multiple shops that ford made the plugs in my truck in a bad way. They have been telling me to change them and breaking them is a 50/50 shot. THEN, when they quote me they charge a rate to replace them plus the plugs themself. If they happen to break one then the customer pays for the new one. Do the plugs would really break that easy and should I plan on replacing some of them?
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I posted this problem several months ago about a p301 code that my 2007 Prius has been generating. I eliminated all the easy stuff... plug, spark unit, fuel injector. Over the past year since I've had the car, the CEL light has gone on for a couple months then shut itself off for a couple, then back on ... probably has shut itself off 3 times in the past year, each time staying off about a month or two before coming back on. Some background on the car, supposedly the PO hit a rock and damaged the motor about 2 years ago and had the short block replaced.
Anyway, the CEL has been on again for about a month, and I got a notice for Illinois emission testing, so I decided to take it in to the dealer and have him do a diagnostic so I can get the emissions passed. After an hour and a half of testing they told me that the best they could ascertain, the car has been submerged in water, as there is a lot of rust in areas that never get any rust, and they think there's a short somewhere.
The service manager at the dealership said if it was his car he wouldn't spend the money for another 5 hours of trouble shooting, and if the car runs good he'd just drive it as is. They cleared the CEL and the service manager just charged me for an oil change as they caught a recall on the steering that hadn't been done and figured he'd let me slide on the hundred for the diagnostic.
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I have searched but with no solid answer..
What I got - 04 Camry, 231K, never had issues, do all my maintenance myself, brakes, plugs, oil etc..
#3 Cyl misfire..
Possible causes
Plugs, - Has been about 2 years since I replaced
Coil - Bought car new in 04, never replaced
Cat - never gave it a second thought
fuel injector - put techron by Chevron just about every oil change, I know I missed one here and there..
burned exhaust valve - say it aint so...
poor compression - I have to rent a tool...
defective computer - I don't think so..
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