Questions about throttle surging ???
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Senior User
Joined: Dec 2004
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From: Bak'O Calif.
Questions about throttle surging ???
We just put our new '05 F350 supercrew through it's first towing and off-road experiences, and had problems with the truck "surging" at very low speeds. It's a manual tranny; about 2800 miles on it.
Here's what happened:
1) towing the 5'er through the campground with a 10 mph speed limit, low gear and/or first gear, flat paved road, the truck would not hold a constant speed - it kept surging and letting off, and made the truck bounce around, which got worse and worse because you can't keep your foot steady on the accelerator pedal. We had to come to a complete stop and try to start up again, about 6 times to make it through the campground.
2) climbing up a fairly steep, rocky, clayey, wet, one-lane fire road, same thing happened when trying to slowly crawl along in 4x4 high (no trailer). Tried putting it in 4x4 low, and it was no different. Ended up having to run through 4 gears in 4x4 low to about 20-25 mph to get the rpm's up enough to hold steady and seriously fly up the road without surging. (On the plus-side, I'm ready for desert racing now!)
Previous to this truck we had a V-10 manual F250, and never had this problem at all. This is our first diesel - can someone tell me what is going on and what to do to fix it?
Much appreciated!!
~~~~~TrekChick
Here's what happened:
1) towing the 5'er through the campground with a 10 mph speed limit, low gear and/or first gear, flat paved road, the truck would not hold a constant speed - it kept surging and letting off, and made the truck bounce around, which got worse and worse because you can't keep your foot steady on the accelerator pedal. We had to come to a complete stop and try to start up again, about 6 times to make it through the campground.
2) climbing up a fairly steep, rocky, clayey, wet, one-lane fire road, same thing happened when trying to slowly crawl along in 4x4 high (no trailer). Tried putting it in 4x4 low, and it was no different. Ended up having to run through 4 gears in 4x4 low to about 20-25 mph to get the rpm's up enough to hold steady and seriously fly up the road without surging. (On the plus-side, I'm ready for desert racing now!)
Previous to this truck we had a V-10 manual F250, and never had this problem at all. This is our first diesel - can someone tell me what is going on and what to do to fix it?
Much appreciated!!
~~~~~TrekChick
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Joined: Apr 2004
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From: Great State of Texas
At your first opportunity you may want to check the oil level. The level should not exceed the mid point on the hash marks of the dip stick.
If the oil level appears to be fine the next possible item could be wire chaffing, although I would think that 2800 miles would be a little early for that to develop. In addition, Ford should have resolved all chaffing issues for '05 MY. But you never know.
Others will surely chime in throughout the day with additional info. Hang in there.
If the oil level appears to be fine the next possible item could be wire chaffing, although I would think that 2800 miles would be a little early for that to develop. In addition, Ford should have resolved all chaffing issues for '05 MY. But you never know.
Others will surely chime in throughout the day with additional info. Hang in there.
Former Vendor
Joined: Mar 2004
Posts: 4,362
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From: Hendersonville, NC
95% of the surging issues I have seen have been injection control pressure related- faulty ICP sensor, malfunctioning Injection Pressure Regulator, ect. See if you can get the dealer to install a "black box" data aquistion and log the ICP sensor voltage reading and the IPR duty cycle.
Tuned
Joined: Oct 2000
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Are you sure its surging? Not to insult, but mine is extremely touchy at low speeds in low gear on rough terrain. I think its the electronic throttle.
BE
BE
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I've had some surging develop lately with my '04 6.0. It seems to do it at low throttle (usually 1500-2000 rpm, 40 to 50 mph cruising through town) and it usually starts and ends without warning. Dealer just re-flashed the PCM and it took care of some other issues (rough idle, harsh disengagement from cruise) but I'm still seeing this issue. Thought at first it was the transmission slipping, but everything checked out. any ideas?
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My 04 6.0 did not start surging until I did my first oil change to Motorcraft 15-40.
They come from the factory with 10-30 and some of them "romp" when you change them over to 15-40. Our local Ford dealer is advising people to run 10-30 and that is what I would have done if I kept it.
They come from the factory with 10-30 and some of them "romp" when you change them over to 15-40. Our local Ford dealer is advising people to run 10-30 and that is what I would have done if I kept it.
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From: Bak'O Calif.
Originally Posted by bedwards
Are you sure its surging? Not to insult, but mine is extremely touchy at low speeds in low gear on rough terrain. I think its the electronic throttle.
A friend that works for the State Bureau of Automotive Repair mentioned to us about the "electronic throttle" - he said that because it's electronic, it should NOT be touchy (like if it was a lose/tight cable or worn out linkage). That is to say, there should be no "mechanical" reason it's bucking & snorting. "Eletronic" - I don't know about that. He also said he'd look further into this for us, but we haven't heard back yet. Also, it's not just rough terrain making it happen - it happens just driving through the flat grocery store parking lot trolling for an open space, or with the trailer hooked up just trying to go slow. The truck just won't (can't?) run less than 15 mph without jumping around. With the 5'er hooked up it felt like we were gonna shear off the kingpin! I was hoping someone else had gone through this, to the point of actually getting it resolved, and could enlighten us on what exactly to ask be fixed when we go back to the dealer.
Thanks again for everyone's input!!
~~~~~TrekChick
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From: Northern Utah
Originally Posted by TrekChick
I was hoping someone else had gone through this, to the point of actually getting it resolved, and could enlighten us on what exactly to ask be fixed when we go back to the dealer.
Commentary: Given my 6.0 ownership experience over the past 26 months and 52,000 miles- I have found the dealers (2) to be quite knowledgable/prompt and decisive about troubleshooting and repairing my 6.0 (Although the first month was frustrating). At this point in time, I am convinced of two things:
#1 A lot of the intial "trouble" with the 6.0s were directly related to poor (no)Tech training offered by FoMoCo combined with a few flash/program glicks.
#2 The 6.0 owner should not be reluctant to bring their truck into the dealer and let them fix it- JMO
Last edited by utahtom; May 6, 2005 at 05:10 PM.
Postmaster
Joined: Dec 2003
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From: Arizona
Originally Posted by brandonconner
I've had some surging develop lately with my '04 6.0. It seems to do it at low throttle (usually 1500-2000 rpm, 40 to 50 mph cruising through town) and it usually starts and ends without warning. Dealer just re-flashed the PCM and it took care of some other issues (rough idle, harsh disengagement from cruise) but I'm still seeing this issue. Thought at first it was the transmission slipping, but everything checked out. any ideas?
I had my truck at the Ford dealership for the same type of problem about 3 weeks ago. It had two problems causing it. A bad EBP sensor and the VGT solenoid was sticking. They replaced both and truck runs fine now.
This is the latest Ford Service Bulletin regarding the P0299:
2003-05 Various Running Problems, Check Engine Light; New EBP Sensor:
Trucks built before 1-17-05 that exhibit buck/jerk, hesitation, lack of power, stalling, stumble, black smoke, surging, rolling idle, changes in engine sound at idle or when driving at a steady speed, or with the trouble codes P2263 or P0299, may have an exhaust backpressure sensor signal that is incorrect or erratic. A revised EBP sensor is available if this is found to be the case. Part number 4C3Z-9J460-A. Broadcast Message 3815.
Normal EBP signal reading should reflect atmospheric pressure with the key on/ engine off. Typically, this is 14.7 PSI/0.88-0.9 volts at sea level, decreasing one PSI/0.10 volt for every 2000 feet of elevation. It should be within 0.5 PSI of BARO and MAP sensor pressure signals.
Hope this helps
