Ford F-150 (2004-2008) :: Rough Idle And Hard Miss Under Load - CEL Code P0306
May 13, 2014
2005 f150 5.4.
I have a slightly rough idle and can feel a miss at 1600 to 2000 RPM. Sometimes running about 65 MPH up a slight grade I can slowly press the gas pedal and the engine will begin to miss much worse, causing the truck to shake pretty bad. When it gets this bad it will slowly flash the CEL and I get a P0306 code (Cyl 6 missfire).
The truck has 148000 Miles on it and the plugs were replaced at approx 120000 by the dealer.
In the last week I have replaced the plug in cylinder 6 (looked ok) and have replaced all the COP's along with the fuel filter and the injector on #6.
I haven't been able to get it flash the CEL light or throw a code since replacing the COPs though and I am at a loss at to what to try next.
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I developed a significant miss on my '00 Excursion 6.8L yesterday and threw a P0306 code. Since the engine has 178K showing and I bought it used, I am planning to replace all the COPs and plugs.
Recommend one COP over another; motorcraft over Accel, etc.? Any preference for spark plugs?
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2005 Ford F150 lariat 5.4
I had a misfire under a bit of a load (acceleration) and up hills. I changed spark plus with OEM Motor craft ones, truck ran super nice for a couple week.
Had the engine light flash, slow down and the RPM go up a tiny bit then back down and the light goes off
Now I'm back to miss fire different location, and a rough idle. I've swapped coil packs around and the miss fire stayed on cylinder 4.
Spark plug screwed or injector or ?????
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I have a 2004 150 with 165,000 miles I sometimes pull a 5 by 8 trailer. when pulling trailer in overdrive and excelorating the engone will cough several times. I took it to a mechanic and he told me that there was nothing he could do that I needed a new engine. I can pull trailer out of overdrive with no problem. don't undrstand why I need new engine....
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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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Just did the timing chain, phasers, oil pump and lash adjusters on my 05 5.4 s-crew. Always had a bit of a rough idle but now it's worse. If the truck idles for an extended period it sets a p0300. Just off idle the misfire is gone. It does seem a touch down on power but otherwise runs great. I did have the plugs out during the work. I cleaned them, applied anti seize and re installed. The previous owner had the plugs and COPs changed 10k miles ago. Plugs are motorcraft and coils are aftermarket.
I monitored with oreillys crappy scan tool and the miss only happens at idle. It is not a dead miss; unplugging COP on each cylinder still makes it worse.
Truck idles warm at like 570 rpm and if I hold my foot on the pedal to raise rpm a bit miss goes away.
Each cylinder is logging misfire counts with no rhyme or reason. The only thing odd during the timing job was 4 spark plugs were partially loose.
I'm sure the timing is correct; I used the OTC crank tool and for timing kit. Truck has 150k, front 02s are fairly new...
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I have a 2005 f150 5.4 3 valve with the p0012 code the truck runs good has a rough idle not sure if it is worth changing the vct or not the truck has 190000 miles....
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So I bought a 2006 F150 stx reg cab with the 4.6l motor with 90k miles on it a few weeks ago. It was in really good condition and I couldn't pass the deal up. All in all, I love this truck. However at idle the truck is a bit rough. No check engine light, but a bit rough non the less. So I hooked up my obd2 torque app and I see I have anywhere between 6 and 60 total counted misfires, but none detected by individual cylinder. So I ran a scan and have a B1360 code without the CEL on. So I changed the plugs and coil packs and cleaned the k&n filer (non cold air filter, just a replacement k&n) and I still have all the symptoms and the b136p code. So I Google the b1360 code and there's very little on it. Basically says open circuit ignition.
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My 2004 Rubicon has been having some idling issues. It idles kind of rough (+- 200 RPM) and is hard to start. I tried to start it recently and after 4 cranks, it started then the CEL came on, and has been on ever since. I have recently moved from Washington state to Houston Texas, and the problem starterd here in Texas. I checked the code and am getting a P0505 code. I had a mechanic replace the IAC valve, Checked for vacuum leaks, and cleaned the throttle body. The mechanic says the output from the main computer appears to have burned out, and needs to replace the main computer(for $1000). The mechanic can clear the CEL, but after turning the jeep off then back on it reappears. The mechanic says he verified the computer was the problem by installing a known good computer and it cleared the problem. Does this sound right to you? If my computer is bad, wouldn't my whole operation be affected?
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My 04 F150 has started having a rough idle. While in park the engine will stall out with the A/C off. Also when in drive the truck will idle close to 1000rpm's. I had to the fuel filter cleaned and also the MAF sensor cleaned. Also did a vacuum check on it. Pulled the code and it's throwing a Lean Code. What else should I be looking for?
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2004 F150 5.4 3v. I bought the truck with 102k on it, it now has 124k. In the morning, when the outside temp is between 30-50, the engine starts and runs fine. When I get to the first red light ( about 1 mile away) within seconds of the engine at idle, engine starts to run rough and CEL. Every time the code is p0351. If I let it sit in the driveway to full warm up... no problem. If I start the truck, shut it off and restart...no problem. It only happens at the cooler temps. I have changed plugs, used motorcraft, nickel antiseize, torqued, etc. Ford changed the coil, I have changed the coil, cleaned MAF. As soon as I cross the intersection, light stays on, rough running clears up, and runs like a champ for the rest of the day.
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Have an 06 F150 5.4 3v with no power. spark knock. rough idle. wants to die while driving, and random misfire code. Have replaced fuel pump, filter, coils and plugs. What to check next? Already thought of EGR - it doesn't have one.
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2005 f150 Lariat 4x4 5.4
Had phasers, tensioners, chains, guides, and sensors replaced. After driving the truck, it started to get a rough idle at low speeds, primarily in reverse. Changed both vct solenoids with no results. Started to get p0022 code. Changed the oil with motorcraft filter and 5w-20 twice after the work had been done, thinking it might need it. Vct's were a little varnished, but not too bad.
After a couple days of light driving, got a misfire on #3. Replaced the coil and it hasn't been back since. I am stumped at this point.
The computer show the timing to be at +13 when sitting stopped and in drive. It fluctuates a little, but not much. When the truck goes into a rough idle. The rpm's fluctuate wildly. It seems to be happening more frequently, the more I drive it.
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I bought a 04 FX-4 a couple months ago with 102k on it. Brought it back to selling dealer, they replaced #1/#6 coils, its ran great till this past week. Again it has stumbled a couple times this week. It only seems to have the miss at idle (comes and goes) take off from light, within 50 feet its running like a champ again. I cleared the codes (disconnect battery)and now it seems my idle is not steady, it fluctuates. Is the idle a product of the codes?
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I have a 2005 5.4 F-150. First off it came to me on a rollback because the owner tried to replace his plugs after he noticed it missing and of course broke one off. So after I extracted the plug from #8 cylinder and installed a new plug I cranked the truck and it was idling very rough and had a terrible miss around 1200rpm. I pulled the codes and got several misfire codes and ignition coil faults on #5,6 and 7 cylinder. Popped in 3 known good coils in these 3 cylinders with no difference.
On Mode 6 on my diagnostic software you could watch the misfire count steadily increase on #7 and every now and then there would be a single misfire on #5 and 6. It also had several codes for O2 sensors biased, stuck rich on that bank. Well since it had a brand new plug and coil, I popped an injector in #7 and havent had a single misfire on it since and it also started idling alot better and all the O2 codes went away. The problem I am having now is #5, 6 and now 8 will randomly misfire, sometimes build up a steady count on one of them, sometimes just skip around between them.
The truck has brand new plugs in all 8 and new coils on this bank also. The truck has 115,000 on it and does have some cam phaser noise on the bank causing the problem, but its not too terribly bad, I have heard alot worse. My problem is something on that bank only as the passenger side bank is fine. I am wanting to say cam phaser now since this is the side with the noise. I have changed them before but have just experienced the noise, never one running like this because of it. Possibly jumped time a little?
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I have a 2004 F150 5.4L 2WD auto. I had the cam phasers and timing cover done at the end of 2014 and the truck was great. Back in december, I parked the truck and when I started it the next morning, there was a horrible miss. I left it parked a month or two, then tried starting it up last week. Nothing.
So I had it towed to the shop. They found the starter was bad, and the only code it was throwing was P0341... Cam sensor bank 2. I had it towed back to my house, replaced the starter and the grounds and fired it up. It had the worst miss on the planet and died shortly after being started. I replaced both cam sensors, and now it starts right up and runs... but still has a bad miss.
I used my scanner and its still throwing A P0341 code almost instantly. It sounds like a bad miss that slightly gets better when you give it gas... but its not throwing any misfire codes or anything.
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I have an 05 F150 with the 3v 5.4 with 170k on it. Last fall we changed the timing chains, cam phasers (aftermarket), plugs, coils (OEM), VVT solenoids (OEM), Cam Position sensors (OEM) and swapped in a GT500 oil pump. Recently under moderate load (fairly heavy acceleration onto the freeway, pulling a large camper) I get a pretty rough misfire. Tonight I pulled the codes and it was Cylinder 5 misfire. In the past I have also had Bank 2 Over-Retarded code. What are the next things to verify and check? I plan to clean the throttle body and change fuel filter but I'm not sure either of those would cause the misfire code?
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I posted a while back about my 04 5.4 having an issue at idle. I did all the normal things like replace coil, spark plug, etc etc. No change to the issue. It still acts as though it's misfiring on a cylinder and I get codes P0306 and P0316. Finally took it to ford and had a diagnostic check ran. Everything on the top end was in working order. The tech even put a known working coil on 6 and nothing changed. I was told that it's either an intake or valve issue on that cylinder. But no definite answer to problem.
Fast forward to yesterday. I got a wild hair at lunch and went out and started truck. Pulled injector plug off of 6. No change to the way it was running. I did the same for 5, 7, 8, 1, and 2. All of which made a big difference in the way it ran. It was obviously misfiring with no fuel to cylinder. This gave me the idea to swap 5 and 6 when I got home to see if the issue followed the injector from 6. I did NOT. I pulled the plug on 5 and got the obvious change in the way it ran. So there is definitely something going on at cylinder 6 that I cannot figure out.
PCM, bad intake, bad valve? I'm not rich so a trip to ford for repair is gonna have to wait. Truck seems to run fine when driving except for slight hesitation during acceleration.
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I have a 2004 Ford F250 with 174,000 miles the truck has a slight miss a rough idle one hot or pulling I have 2 codes nut no light when I go into the ford oem feature in my scanner a PO 272 and a PO404 .. Where to start?
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For the techs in here, I have a data logger (AutoTap) and the symptoms are low idle and sometimes it runs rough idling and driving. It had me thinking the fuel pump was going out. That is not the case. I did get into part swapping mode so I have new plugs and coils and new VCTs all in the last 24 hours. The engine has 85K miles on it (rebuilt ford long block), truck had 150K. I'm not sure what parts were replaced when the longblock was replaced but I'm guessing the 02's are original.
Data that looks odd to me in the Autotap real time data logging is this:
- STFT Bank 2, goes from 10-15% and climbs till its over 300% and then the truck goes into Open Loop due to an error (per the Autotap) but it never says what error and the CEL never lights. Idle goes up when its in open loop and then after a minute or two it will drop back into closed loop.
- Fuel pressure never drops below 37
- Idle will drop to 250rpm
- Engine load at idle is 25%?! With AC on and idling (at 550rpm) engine load is 42%? Seems high no?
Nothing else other than the STFT Bank 2 and the high engine load seems out of miss. No misfires, codes, etc. What else should I look at?
Other background/patient history:
- Alternator #3 was installed 2 weeks, It replaced alternator #2 that went in 4 months ago to replace the original alternator (144K miles). Both died and caused low voltage/battery dying symptoms and verified by volt meter.
- FPDM was replaced proactively 8 months ago just because I don't want it to break down when I'm towing my race car.
- I have not tried cleaning MAF, EGR?, IAC, nor have I replaced O2s. The only thing that leads me to believe MAF might need cleaning is the load?
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I have a 2000 Toyota Avalon XLS with 134k miles, engine is a v6 (3.0). It has a rough idle and a steady misfire. You can drive it sometimes and it will run perfect and you can drive it sometimes and it will misfire. I am getting codes P1150, P0300,P0302, P0304,P0306. Driving me nuts.
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