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I have a 99 F250, 270k miles. I started to notice around 40-45mph, under very light throttle the truck would shudder or jerk lightly. At first I thought maybe a transmission issue, but I can sometimes hear a change in engine tone and possibly the injectors cackle harder. You can throttle up and the issue goes away. No power loss either, no smoke, no oil leaks no hard codes. I've been able to replicate it at higher mphs, but it's not as noticeable.
Someone mentioned they had that with a bad EBPV sticking, I did find my pigtail was torn off and the wires were shorted, removed it and still have the issue. I've replaced the ICP, CPS, IPR and EBPV sensor all with motorcraft recently, the issue remains.
I've also ran a injector buzz test, all seemed to pass.
I'm going to go ahead and install a deleted turbo pedestal and while I'm in their check the wiring and replace the UVCH for both sides.
Any clues what is causing this issue, or where to start?
What are you using to read codes? - recommend FORScan. I would run FORScan on the next few drives, and save a CSV file of the data the next time this occurs. Post it here and we can review it for clues.
With the issue going away at throttle up, probably not fuel pressure, but I'd recommend getting a number on that anyway on these older trucks. Has the hutch mod been done or fuel tank screens cleaned?
That sounds very much like injectors to me. Next time you have the valve covers off, pop the solenoids off and check the clearances between the armature plates and poppet bodies of each injector. A new injector has about 0.004" clearance and decreases as the poppet valve seats wear over time. You'll usually start noticing those symptoms when the clearance falls below 0.0015" or so.
What are you using to read codes? - recommend FORScan. I would run FORScan on the next few drives, and save a CSV file of the data the next time this occurs. Post it here and we can review it for clues.
With the issue going away at throttle up, probably not fuel pressure, but I'd recommend getting a number on that anyway on these older trucks. Has the hutch mod been done or fuel tank screens cleaned?
I'm using AE. What parameters should I log to look at?
That sounds very much like injectors to me. Next time you have the valve covers off, pop the solenoids off and check the clearances between the armature plates and poppet bodies of each injector. A new injector has about 0.004" clearance and decreases as the poppet valve seats wear over time. You'll usually start noticing those symptoms when the clearance falls below 0.0015" or so.
I'll have to read up on that, I've never removed the solenoids, but as soon as I understand it I'll check.
Full synthetic oil can help older injectors work properly. Just buying time tho.
I have full experience with that.
with T4 15w40, startups were rough and it took 15 minutes for the engine to run really good.
I changed to Lorenzo 5w40 pure synthetic and after a 1,000 miles it was able to start in 20*F Wx w/o the Block Heater plugged in.
Now, with 2500 miles on the oil, it starts within a few seconds and settles into a smooth idle immediately....
for me, that is much nicer than buying new Injectors.
Odometer is 182,000 right now.
makes me almost want to buy more Lorenzo oil, but but but, it is terribly expensive...
this stuff does what they claim...
click on that pix, and blow the label up 10X, and read it...
incredible oil.
with T4 15w40, startups were rough and it took 15 minutes for the engine to run really good.
I changed to Lorenzo 5w40 pure synthetic and after a 1,000 miles it was able to start in 20*F Wx w/o the Block Heater plugged in.
Now, with 2500 miles on the oil, it starts within a few seconds and settles into a smooth idle immediately....
for me, that is much nicer than buying new Injectors.
Odometer is 182,000 right now.
makes me almost want to buy more Lorenzo oil, but but but, it is terribly expensive...
this stuff does what they claim...
click on that pix, and blow the label up 10X, and read it...
incredible oil.
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.
