Ford Super Duty (1999-2016) :: Stalling Under Load / Intermittent
My current truck is an early 99 F250, 7.3L diesel, CC 4x4(manual shift transaxle) auto transmission. It is basically stock, with the exception of a hutch/harpoon and a new fuel pump over the winter, an AIS intake. I have a magnaflow exhaust kit in the garage along with bellowed up pipes but have not installed them yet.
Here is my issue. Several times over the last 2 years, the truck will pull a load, or long trip, and with complete randomness, the engine will feel like it has shut off, there is usually a jerk or two, and the truck "restarts" itself and continues on like nothing happened. Last year we drove 1.5 hrs from home with the boat in tow, driving up Snoqualmie pass, and it died completely, no restart. We had to be towed home. It started right up at the shop, so no real clue of what happened.
When this happened, I had the fuel system checked for pressure and replaced the engine fuel filter, and all was good. I also had the Cam position sensor replaced/updated to the new grey sensor. Shortly after, I had the minor jerk/stall occur again, so I replaced the fuel pump and did the hutch/harpoon mod to ensure there wasn't an intermittent fuel pressure loss and that the in tank filters were not clogged.
Last weekend, i pulled my boat to Oregon, and the same "hiccup" happened as I was about 1.5 hrs into my trip. it was fine after that the rest of the 4 hr trip. We also drove back the same route and had no problems.
Ford Super Duty (1999-2016) :: 2008 - Overheating Under Load
I have a 2008 powerstroke. Dpf and egr have been fully deleted. SCT tuner seems great and have had no issues since installed 6 months ago. I recently hooked up to my camper and headed up a mountain pass. As soon as I started uphill the engine overheated. I allowed it to cool and tried again with the same result. Eventually had to unhook and have another 6.4 (this one being a 2010) pull the trailer the rest of the way. Haven't had any heating issues since unhooking.
View 7 RepliesFord Super Duty (1999-2016) :: F250 - Skipping / Surging Under Load
I have a 99 f250 that seems like it has a bad coil, under a load it starts surging or bumping ( like it has in the past and I found a bad coil), I went through and unplugged each coil one by one while idling, couldn't find a bad one, so I bought a new coil and went through and rotated the coils, nothing worked, no check engine lights on.
View 9 RepliesFord Super Duty (1999-2016) :: Vibration When Starting Out In First Gear Under Load?
I have begun to notice a vibration when I am in first gear starting out with a bit of a load. The vibration goes away as I gain speed and the load reduces. None at any of the higher gears. If I take off real easy and allow the truck to gain speed without pushing it, the vibration does not exist. The truck is the one outlined in my signature. It is equipped with a 3 speed auto with overdrive. I am thinking this could be a U-Joint that might be starting to go out.
View 9 RepliesFord Super Duty (1999-2016) :: F250 - Whistling Turbo Under Load
Just bought a 1999 7.3 f250 w/71000 miles and took it to a diesel guy and under load he said that the whistling was normal..is this correct?
View 3 RepliesFord Super Duty (1999-2016) :: 2003 F250 5.4 - Starts Cutting Out When Under Load
About 20 miles into it, and it starts cutting out on me under load, over about 1/4 throttle. I baby it a ways further, and park at a wal-mart. Idles fine, but once again, after 1/4 runs like crap, acts like it's back firing through the intake spit and sputtering. Have the wife come pick me up since I was heading to work. Decided to shut it off, and restart, and it acts like its never had a problem.
Was messing with it today, and let it warm up in the driveway. Once it got hot, same story good 1/4 throttle, past that, not so much. Shut it off, started it back up and drove it to see if there's any codes at vatozone. Drove good (laying into the throttle) for about 2-3 minutes, back to same behavior. Hooked up code reader, no current codes, and no historic codes. Although I did notice (actually since I bought the truck) that the check engine light never comes on, even at initial start up. Looking at my spare cluster, it's an l.e.d. So no bulb out I guess unless the led is bad. Truck has around 130,000 miles on it. Everything is stock.
I'm leaning toward a fuel pump, a clogged cat, or a fuel pump relay or cutoff switch problem.. It doesn't have any other issues than that, and has been a good truck for the 10k miles I've owned it... 2003 F250 5.4...
Ford Super Duty (1999-2016) :: 2001 - No Power Under Load Or Full Throttle
This has just started this past weekend out of no where.I went to accelerate up a hill and when it got to around 2500 rpms it just starts acting like a rev limiter kicks in.When i let off throttle it smooths out and runs fine, seems anytime its past quarter throttle it doesnt not want to move anywhere.If you drive normal in city conditions or on a nice flat round with barely any throttle it runs fine.I replaced the fuel filter no change, removed air filter no difference.Its actually at the shop now and they say its a transmission problem, my opinion i disagree fluid is up, no burning smell, and shifts fine under normal (slow) driving. 2001 Super duty 5.4 triton....
View 14 RepliesFord Super Duty (1999-2016) :: Transmission Rattle At Low RPM Especially In Lower Gears Under Load
This is an early 99 f250 powerstroke 6spd manual 4wd, is it common or normal to hear a lot of transmission rattle at low rpm especially in lower gears under a load. Starting off from a dead stop it sounds awful until about 1500 rpm where it clears up (or load is reduced). I'm hoping it's just the power pulses going through splined shafts, gears, etc.
210k on the truck, just changed every fluid in it.
I've been a honda owner and mechanic for all of my driving years where shifting at 8500 rpm is common and now I'm having a hard time learning what this thing likes, rpm ranges to avoid, ect; even shifting I find difficult. At least you can heel toe with the pedal arrangement...
Ford Super Duty (1999-2016) :: F550 - Uneven Load On Rear Suspension
I have a new to me 1999 f550 w/ 7.3 and I have installed an aluminum service body with a crane on the passenger side bins. The crane itself weights about 650lbs plus the steel frame it is mounted on (superstructure in the aluminum service body). I'm concerned about the uneven load on the rear suspension. It does sag slightly to the passenger side - guessing 1" - I will measure tomorrow.
1) Should I be concerned?
2) What can I do to correct it? (without just adding weight to counter balance it).
Ford Super Duty (1999-2016) :: 2001 F250 - Slight Bucking Under Load
I have a 2001 Ford F-250 5.4L V8. 117,000 miles. The problem I have been relentlessly trying to diagnose is a slight bucking that occurs under load when the truck is in overdrive. When the truck bumps up to higher RPM's it is fine but when it is around 1500-1700 RPMs on the highway it does a small buck like I'm hitting a bump in the road. I know there are many threads on this but none of them have gotten me any closer to a resolution. It also seems to have a bit of power loss when accelerating. Things I have done so far.
-Spark plugs and COP replaced about 1000 miles ago
-New fuel filter
-Cleaned MAF sensor
-Cleaned throttle body
-New PCV
-Seafoam treatment in gas and through brake booster.
Ford Super Duty (1999-2016) :: 2002 F350 - Ticking Noise Under Load
I was having a ticking problem with the engine under load so I went ahead and did my manifold gaskets. I had a new 5.4 put in my 02 f350 last winter, and at that time I also installed gibson shorty headers. The tech had to plug the egr port with a pipe plug. But any ways, I pulled the headers last month and I used Percy's aluminum header gaskets. I also took the time to wire wheel all of the flanges and the mating surfaces. The one on the ball and socket flange was leaking on the passenger side, so I permanently sealed it with some 1800* epoxy.
The leak seemingly went away for a week or so, but it has returned. I sprayed down all of the mating surfaces with soapy water, but I can't find the leak. It only happens when accelerating or when i downshift to go uphill. So, at my wits end, I went to try and retorque my spark plugs. I've done half of them so far. Haven't driven it yet, but i was curious as to others thoughts on the subject. This leak cannot be heard at idle, nor at any RPM while in park or neutral. It is only apparent when driving. Definitely sounds like an exhaust leak to me.
Ford Super Duty (1999-2016) :: Vibration Mostly Noticeable While Under A Load Like Climbing A Hill
My current 08 duty was bought with what I believe to be a procomp 6" lift modified to an 8" lift. The 100 mile drive home after buying the truck showed a tiny "hop" in the rear. I ditched the 37s for some new 35s. Still a tiny hop, mostly noticeable while under a load like climbing a hill. I pulled the rear driveshaft and had it fully rebuilt with a new carrier bearing as well. Still gots the hop? The truck has a carrier bearing drop bracket but I think it may be insufficient for the lift.
The rear driveshaft still has a slight bend in the middle of where the two driveshaft pieces connect. Are the 2 piece driveshafts on your 8" lifted trucks sitting straight with each other or do they have this bend as well?? I am thinking if I get a bigger drop bracket it may cure this slight hop I have? Lots of lifted trucks where I live but they are dam near all shortbox with 1 piece rear shafts so I haven't been able to find one to compare. By the way, my truck also has pro comp rear traction bars..
Ford Super Duty (1999-2016) :: Engine Blows Out Smoke When Pulling Load?
Truck blows smoke like a blown NASCAR engine occasionally when pulling heavy load....pull over, cool off and resume driving. Its as if it never happened. All fluid levels are in range and truck drives fine minus load. My last f350 5.4 did same thing at about 200k miles. My local ford dealer tells me I'm the only guy on earth this Has happened to.
View 8 RepliesFord Super Duty (1999-2016) :: F350 RPMs Surges When Going Uphill With A Load
1999 F350 7.3 Super Duty surges when going uphill with a load. The only time we drive it is when towing the horse trailer - also has a camper on.
The truck doesn't physically surge, just the RPM gauge goes up and down and along with it a humming noise.
Also, What conditions should I engage the towing button on the end of the gear shift? I've heard several answers. Should it be engaged when towing or off?
Ford Super Duty (1999-2016) :: 2015 F350 - Takeoff Vibration Or Shudder Under Load
My 2015 F-350 Super Duty has a noticeable vibration between 5 and 15 mph when accelerating with my 5th wheel. The 5th wheel is heavy--around 14000 pounds. The pin weight is heavy--around 3000 pounds. The Owner's Manual says on page 191 "When driving with a trailer or payload, a slight vibration or shudder may be present due to the increased payload weight..." (This was brought to my attention by my dealer.)
Seeing the thousands of F-250 and F-350 Fords pulling 5th wheels out there on the road, I wonder how many have this "slight vibration or shudder" and what they have done about it.
Ford Super Duty (1999-2016) :: 2008 F250 - Vibration When Accelerating From A Stop And Under Load
My F250 6.4, 3.73 Crew Cab Short bed vibrates when accelerating from a stop with my 5th wheel on. The 5th wheel weighs 12K. It is a medium to high frequency vibration that is felt throughout the entire truck. It continues through the shift into 2nd (TorqueShift Tranny). The harder you accelerate the more you feel it.
It does not occur if truck is unloaded and you accelerate at full throttle. Is this normal or should I get it looked at?
Ford Super Duty (1999-2016) :: Trans Fluid Leak After Pulling Heavy Load
I have a 2000 SD F250, gasser, auto. Last week I pulled a heavy load and developed a tranny fluid leak. The fluid appears to be coming from what looks like a freeze plug on the bottom of the casing forward of the (torque converter?) pan . Is that plug easily replaced by a DYIer. Small leak. 150K on the motor. First time it has leaked. Heaviest load I've pulled.
View 2 RepliesFord Super Duty (1999-2016) :: Running Rough / Sputtering When Under Load - Replacing Plugs Only?
My '99 was running rough - coughing/spitting/sputtering when under a load - especially at lower idle/rpms and going up inclines.
Brought to mechanic and he put it on "the scope" which told him the #1 pack was bad. Replaced. Got it back and it ran better, but, then went back to the coughing/sputtering.
Replaced the spark plugs - OEM Motorcrafts. Seemed perfect for a wee bit, now I notice an occasional cough/spit but all in all not bad.
Curious: was it foolish to not replace ALL coil packs at time of plugs or is it ...acceptable to do just the plugs and then come back and do packs if needed.
Ford Super Duty (1999-2016) :: 2002 F250 V10 Rough Idle / Misfire Under Load
I have a 2002 F250 CCSB Lariat 4x4 with the Triton V10, I'm up to 232,000 miles so far and fairly happy with the old girl. Just this weekend, I noticed some hesitation when at idle and even more rough running when under slight load. The misfire/hesitation is worst when going up a slight hill, when the truck is accelerating at low RPMs.
I am getting zero trouble codes or freeze frame conditions on my scanner. What should be my order of diagnosis? Vacuum test at line from PCV to TB, COP test? EGR inspection? Plug inspection? Also, how do you test a coil if resistance is not a reliable method?