Ford 6.0L Power Stroke Diesel :: Stuttering And Hesitation Starts At About 1500 RPM / Go Away At 2000
Sep 6, 2017
I've only owned a 6.0 for about 10 months now. I have a 2005 SCab FX4 with 125,000 miles on it. It has an Airaid cold air intake and MBRP exhaust without a muffler, everything else is stock. The stuttering/hesitation starts at about 1500 rpm, is worst at 1600rpm and seem so to go away at 2000rpm. It also seems to hesitate when I barely press the gas pedal while driving. Based on other fuel issues with other vehicles, I would assume this is a fuel problem, but am not well versed in the 6.0 engines. Fuel filters were said to be good by the dealership about 10,000 miles ago. EGR valve was replaced last week. I'm not blowing smoke of any color, even at WOT. I was thinking an injector may be the issue, but I show no other symptoms besides the hesitation/vibration. I don't feel any lack of power when I give it full throttle. I would like to know a definitive way to diagnose the problem without going to the stealership.
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I'm having a problem with my 6.0 back in September I started to notice a little miss with some black and white smock while accelerating so I took the truck to a power stroke specialist near my house to have it diagnosed they said my number 5 injector was starting to go bad so just this last week I finally got up enough money to get the injector changed I got the truck back yesterday from the mechanic. While driving I get a lot of shaking right around 1500 to 2000 rpms when I let off the accelerator it smooths out if I mash on it and keep the RPMs above 2000 it smooths out the truck still has a lot of power no check engine light has ever been on through this whole ordeal and there's a rough idle I guess the best way to describe the shacking would be if the truck was a standard shift and you were pulling a hill in to hi of a gear.
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I fear my truck may be stuttering on acceleration.
I hooked up a fuel pressure gauge tonight and the fuel PSI at idle and under acceleration... barely moved. Stayed between 60-62PSI.
I'm thinking this isn't normal... shouldn't the PSI be reduced especially when I accelerate hard ?
I'm thinking the "delivery" fuel line... perhaps there is a bottle neck somewhere which is causing constant PSI at the fuel housing ?
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2005 6.0 133000 miles... Truck has been stuttering and running rough for about 2 weeks, warms up and is somewhat better. Would stutter in the RPM range of 1600 to 2100 RPM, can push down on accelerator and power through it with no problems. Checked codes and got PO269 Contribution Cylinder 3. Changed all filters and oil change along with a bottle of hot shot secret in the oil. Truck is now blowing blackish grey smoke under throttle and when idling that smells like fuel. No coolant in oil, and no oil in coolant.is the injector shot, or injector sleeve bad?
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I recently picked up a 2000 Excursion with the 5.4 V8. Engine has 150,000. I got it cheap because it has a surging problem over 1500 RPM. This problem is intermittent.
I have 1 DTC. P1000 which is OBDII checks not complete. I cannot clear this even using the factory procedures. FYI..I have a snap on solus scanner. I think this is a voltage problem, If you try to start the engine with the scanner plugged in, the scanner shuts off, so I'm thinking the PCM loses battery power supply when the starter engages, resetting the PCM.
This problem is NOT a miss.... something isn't opening or shutting off above 1500 RPM. This truck doesn't have an EGR system, it has the EVAP system. This may be the problem, thats why I'm here. OK. heres a list of what I've replaced since I started working on it.
Engine oil and filter
air filter
fuel filter
8 COP's
8 plugs gapped properly
cam position sensor
IAC sensor
MAF sensor
Removed throttle body and cleaned.
Vacuum checks. 22" at purge valve,fuel dia, and vacuum canister
Checking with the scanner at 1500 RPM with problem
SFtrim1% bounces between5-15
SFtrim2% bounces between2-0
LFtrim1% bounces between11-13
LFtrim2% bounces between 5-6
O2S11(mv) bounces between 200-781
O2S21(mv) bounces between 200-800
Ssystem is in closed loop holding throttle at 1500 RPM... Note engine surges when at the RPM or above. I'm thinking the engine is lean, not sure how to read the trim numbers...
Idle is fine ... Problem is intermittent ... Also noticed that engine will only advance spark to 30 degrees @2000 RPM during this problem. I have seen it advance to 38-40 degrees when I do not have this problem, so I kind of understand the power loss,knock etc due to the timing, my question is whats causing it to do this?
EVAP question.... The purge valve should open according to PCM command a certain value, correct? I can monitor the duty cycle % but cannot activate and check proper duty cycle through scanner . When I try to I get an error message of module error -unspecified.
Disconnected hoses at purge valve,Full manifold vacumn on one, nothing on other, no flow through purge valve, but scanner shows 30% duty cycle. I would think the should be a little flow at 30% Maybe my problem? Troubleshoot procedure for the EVAP would be good.
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So I changed my oil with T6 and archoil and immediate miss at around 1500rpm then it clears up. I can stomp on it after that and it's fine. I know this has happened to others. My last oil change was also T6 and archoil. 2005 F250, stock, atlas 40, 216,000 miles.
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Me and the wife just now noticed this issue after about a week of owning this 6.0 f350 auto 4x4. Leaf spring front and rear. Long bed. Listing all this stuff because not sure if it matters.
Around 50mph if we drive normally about 1500rpm the truck seems to jerk a little as we climb in speed. If we get the truck into the 2000rpm range it goes away.
Not sure if it's suspension, transmission or engine. Any clue what it could be. ???
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Well, last night I took my F-350 up a wheeling trail. I'd been up quite a few times in my old Rover, so I knew I could go a ways in without damage. Just uphill, muddy, and ruts / rock steps.
One thing I notice is that when you engage low range in the diesel, the transmission starts in 2nd gear. My previous gas Super Duties always started in 1st. I'm assuming this is to protect the transfer case from torque overload. Also, the throttle response seems to change when low is engaged (the pedal becomes less responsive, which is nice).
I've had the gas Super Duties off road before, and all of mine have had the locking rear diff. The diesel lugged along perfectly. My biggest fear was crunching the DPF / SCR / DOC canister on a rock step. In that respect, I'd rather wheel a gas. The manual shift function makes a lot of sense in low range - you can force a start in 1st, 2nd, or 3rd. And prevent meaningless up / down shifts since the grade can change quickly.
These trucks' biggest hindrance is their size. However, if you have the trail room, they are actually excellent off road. Many people look at a Super Duty and see a vehicle good only for pulling or hauling. Not so, these trucks are as good as a Jeep off road, again with trail room being the only concern. The locking rear diff was never really needed, but I engaged and disengaged a few times to keep the mechanism free. I really love this feature.
One thing that happens frequently for me in north-east wheeling is water crossings. Could be a simple brook but mostly it is mud holes encountered on tight trails. In some cases these are only a foot or so deep; in other cases they are 4 feet deep. Ford states to "try" to keep the water below the level of the hubs, which amounts to about 15". Aside from possible front axle contamination, my biggest concern would be the electronics on the diesel which are mounted to the frame or floor pan (transmission module, NOx module, etc.) The gas Super Duties don't have these concerns. In the old days, as long as a diesel had air, the engine would run under water. This engine requires electronic control of many things, including the injectors...so it won't. There are also some axle / transmission breathers which run about floor pan high to be concerned about, but these can be easily extended.
Maybe it's due to the twisty frame which GM loves to insult Ford about, but these trucks have excellent wheel articulation. I'd be surprised if a coil sprung power wagon flexed more, at least in the rear. I'm impressed.
Finally, the traction control. I experimented a bit on a slippery rock step. This was the only step which required the rear locker - sort of. The front wheels climbed the step, but the back flexed to the point of one rear wheel basically almost off the ground and severely unloaded. With 4x4 Low engaged, and traction control "off" as much as Ford will allow, the truck could not pull itself up. Turning traction control on allowed the truck to very nearly pull itself up. A little more throttle / finesse probably would have gotten the truck over, but lots of ETC operation glazes the brakes and spews brake dust everywhere. Being able to start in a higher gear manually really adjusts the torque control. Locking the rear end and the loaded wheel bit right in and she went up and over.
When doing some off-road driving, the "off-road" screen for those of you with the LCD message center is kind of fun and informative to watch. It's nice to see how far your wheels are turned left or right when spinning in ruts or what crazy angle your truck is on. Howie Long could probably document the exact up / down / left / right slope angle a Super Duty needs to be on in order for the tailgate not to open. I never had an reason to open the tailgate while in these crazy angles, of course.
Overall, very impressed. It's not as good as my old Range Rover, but I would say more talented off road than ALL other Ford vehicles except the Raptor.
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Very weird thing happened on the way home from work. When I left work (not to full temp) at about 1500 rpm and 30 mph (had to be at 30mph--seemed to be the key) the whole truck felt like it was rolling across rumple strips (the ones one the shoulder of the road) all vitals were normal and it was gone once on the interstate and up to temp (I did gon on it to blow out anything that may have needed to be) it felt more like drive line but honestly can't say. 2006 F350 4X4 ....
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So lately I have been having issues with my 6.0 smoking, hesitating, and chugging. It seems worse when the vehicle has been idling for a minute or two (as in at a red light) and when I depress the accelerator it starts to move, but chugs and sputters, spurting light gray smoke, then the boost hits hard, the truck surges forward, leaving a massive cloud of smoke behind, then seems to run fine until I come to a stop again. I got the usual EGR codes, so I cleared the codes, pulled and cleaned the EGR valve of all built up soot and carbon, and reinstalled it. It seemed to run okay again right after doing that work on it, but then started acting up again this afternoon.
Shot the same codes for EGR (P0404, P1335). I cleared them again, and it continues to drive like crap. Other than EGR that I can look into? Or will I need to pull and clean the valve again tomorrow when the sun is up? At first I was thinking I might also be having fuel injector stiction issues, possibly turbo vane stiction issues, maybe FICM issues, but it's only feeding me codes for EGR.
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I'm taking my new to me 2011 KR 6.7 I've had it 1 week, to the dealer tomorrow to get them to look at the hesitation on takeoff. I have read on here that not all trucks are doing it. There is 25500 miles on it and have been averaging 15.3 mpg empty, is this about normal for what people are seeing? I'm running the 3.31 gear ad I thought I would get better mpg. This truck was built in Feb. of 2011 would it have the 400/800 settings or would it have to be flashed?
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My truck is developing a hesitation or a miss when accelerating. It only does it in the beginning of accelerating like when just starting off from a stop. Seems like its more noticeable with the more I get on it. If that makes any sense. When just lightly accelerating it doesn't do it, like going slow through town from light to light. But when I give it more is when I feel it. It seems like it only does it before the turbo kicks in and it puts out a little smoke too only before turbo kick in. After that it runs good with no noticeable miss or anything. WOT runs feel good after it clears up. Its just when first starting out with anymore that 1/4 throttle I can feel it.
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I have a 06 f250 king ranch with 6.0 . A few days ago my scangauge showed a code P0405
I changed my egr and after it showed two codes : P0405 and P0404
It still has a hesitation and loss of power , although better than before the Change.
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i bought a used 2011 F250 and really like the truck and there is no comparison when towing the trailer.
1.) I've noticed the truck doesn't shift smoothly from 3rd to 4th. Under light acceleration the RPMs climb, then drop slightly, then climb, and finally the truck shifts into 4th gear. It's almost like the truck wants to shift but doesn't. I believe a selenoid was replaced on the truck.
2.) From a dead stop, when pushing slightly on the gas pedal there is a slight hesitation or unresponsiveness with the truck wanting to proceed forward.
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So I was turning into my neighborhood tonite, when I got a really loud thud and a major hesitation in the engine. Fortunately I was in my neighborhood and could basically coast to my house.
No CEL came on and I don't seem to have any leakage (only thing dripping underneath was condensation from a/c I believe). Obviously too late for service tonite, so have tow scheduled for 7am. What could have happened? The no CEL has me confused. I was able to restart it and it seems to idle fine, but give it has and it hesitates.
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When I am on the highway, my 2005 Excursion (6.0) will hesitate/sputter/buck intermittently, usually between 70-80mph/ 1800-2200 RPM, but especially triggered by hills and inclines. Each sputtering episode usually lasts about 5-10 seconds and then will go away for minutes at a time. Does not sputter upon take off or initial acceleration. There is no smoke of any kind. Just got it out of the shop where the mechanic replaced ALL 8 injectors and the fuel pump, as well as flushed the fuel lines, and new fuel filters, and oil change (2 injectors were bad, but there was metal in the fuel filters, so to be safe I replaced all of them - ALL OEM PARTS for everything, including filters).
The week before, I had the IPR valve replaced. Also, recently had the back pressure sensor replaced and the EGR was deleted - and turbo cleaned when the EGR was deleted last month. I also tried unplugging the ICP sensor to make sure that wasn't the issue. Dropped $6k into this thing in the past month and about to lose my mind (and wallet). All research points to either clogged EGR or bad fuel injectors, but both have been addressed, so I am not sure where to look next. No current codes showing up. No signs of leaking oil.
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Have just about 1,600 miles on tuck born on 12/14/11. Love it, but.. When going slow in subdivision I am getting some hesitation/bucking when going in the upper 20s/lower 30s. When I feel it I look down and I am usually in 3rd. Is this the transmissible thing? When it happened Sunday it felt like it was going to die. If I start off with a quicker start (to get to highway speed) it shifts fine. It just started the last few weekends......
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Finally registered on this site after hearing good things from others who are currently on here. Been a 6.0 PSD owner since buying the truck since new in 2003-F250 CCSB. I have done regular maintenance on it and have had a good run until recently. Everything is stock on the motor and currently has 229 000 miles.
I will describe my current problem: I have borrowed my brother's tablet and have the following numbers from the Torque pro app. While trying to accelerate it now has a hesitation and seems to not have the power.
At idle: 630 psi HPOP, 24 % IPR, 47 volts FICM, ICP volts .1
Trying to accelerate on at highway speeds: 1230 psi HPOP, 83% IPR, 47 volts FICM, ICP volts 2.6
Also, sometimes when starting the truck it seems to rev extra high for a split second. My brother says I may have a high pressure leak on the system. What I should check first?
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Recently I replaced the unison ring on my turbo, EBP sensor and cleaned carbon out EBP tube/upper part of motor. After doing so she seemed to run fine but not like I remember when I first got her. Plenty of power but ever so slightly off, only an owner would notice. Few weeks later she hesitates a little bit while she's cold in the morning. I let her run 3-5 minutes b4 actually driving but as u know it's a little while to get up to operating temp. Temps seem OK 190-200 EOT/ECT. Fresh oil/filter, air filter, coolant, EGR was cleaned out a little while back and EGR valve replaced 25k ago. I'm not sure where to look at this point...the motor has about 30k on it.
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So it looks like my lift pump (low pressure fuel pump and sending unit) is going. Multiple low fuel pressure warnings over last two days and hesitation at low RPMs. Not hearing pump run when I turn the key all the time but no issues starting. About 16,000 miles since last fuel filter change but picked up new filters today at dealer.
Asked about a fuel pump and he quoted PS401 and none available in Canada and had to inquire direct to Ford - 30 day wait on a part that will turn my truck into a brick if not replaced. Can't find a PS401 but I can get a PS 402 out if the USA in 5 days.
Any difference in these? Dealer is an idiot and can't even determine if there is a difference or too lazy to find out for me. I don't even know if I can prime the truck if I change filters at this point and this is a quick change job for me if I had the pump. Going over the system from back to front in the morning.
Don't ask about warranty. Just hit 160,000 KM on my truck.
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Trying to troubleshoot a very intermittent (has happened on two different occasions during the last 1,000 miles) hesitation from a stop-light. I've been recording engine parameters (Torque application) on both instances as these have been during longer trips after a period of highway driving. 2004 Excursion, 112K miles.
This feels kind of like severe turbo hesitation (4 to 10 seconds trying to start out before it kicks in) but I don't think that's it. The turbo is a new PowerMax turbo replaced 5 months ago. VGT readings seem pretty normal. The EGR valve is new -- the first instance was with the old and the second was with the new. I've also recently replaced the EGR and Oil coolers (before this).
Here's what's interesting in the captured data though... Normally when I coast into a stop-light the indicated engine load stabilizes at about 40-50% and VGT moves to about 65% to 70% at idle. The two different times this happened (actually multiple times at stop-signs/light close to each other over 5 minutes or so for both of these), when I have coasted to the stop, the engine load increases from low values during coast-down (0% during freeway coast-down or 19-30% during other coast) up to 99.6% (or other similar high values) at idle and VGT seems to be full closed at 85%.
There is absolutely no response to the throttle in this situation for 5-10 seconds. I've either been goosing the throttle a bit or putting it neutral and revving it up first to get things going again. When it finally catches and starts accelerating with power, indicated engine load drops to 50-60% again and VGT opens up to 40-60% or so. None of the other parameters I've been capturing seem to read strangely during this that I recognize. No issues observed during cruise and power seems good. No pending DTCs or engine light.
Here's what the data points I'm capturing (once each second):
Boost
Calibration Input Volts
ECT
EOT
Fan RPM
FICM main volts
Fuel Injector pulse width
ICP
ICP Volts
IPR Duty cycle
RPM
Engine Load
MAP
Trans Temp
VGT Duty Cycle
EBP
EGR Commanded
EGR Error
Added today but not captured during these issues yet:
IAT
IAT2
Baro
Accel Pedal Position
Mass Airflow Rate
Mass Fuel Desired
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