[vitamin diesel]

i just got on R&R here last week. packed up the truck and headed home west to western PA. on the way the ol girl was bucking pretty violently once it hit over 35 mph up until about 65. to the point where i had to turn off OD and let the rpms stay high until i got to highway speeds. all the while on heavy accelerating it sounded like it was missing mixed with a little white smoke.

well lately its been a bugger to get started. usually it takes a good 10 seconds of cranking, followed by the romps and alot of white smoke.

this morning i was pulling up to a stop light and it was fine, on take off it stuttered with an rpm drop and finally picked back up, i almost thought it was going to stall. well its been doing that all day now, but only when its warmed up.

im starting to heavily suspect the injectors, but i wanted to get some other opinions. Thanks guys,
Chuck.

Early1999 f250, ext cab long bed, 325k miles.

 

[RT]

Well, that's a lot of miles - are they the original injectors? I would want to do some testing before you jumped at expensive parts. Do you have access to AutoEnginuity? Your symptoms could be explained by a lot of little things - such as the IPR, ICP sensor, or torn injector o-rings. How is your oil? Any way to check fuel pressure? I'd check those first - could be a $2 repair...

If you don't have immediate access to the scanner - pull your ICP sensor wire and give it a try. Check to make sure there isn't any oil on the sensor or harness.

 

[vitamin diesel]

they're either originals or they're rebuilt as they have the original solenoids on top. i just replaced the injector orings before winter set in last year trying to cure a magical loss of oil. that fixed the oil situation but everything else was still the same. i left right as winter set in december and the trucks been sitting since then.
ive been on the fence on the autoengunity, so i might finally break down and buy it. ive got some cash to burn anyways.

no oil in the icp either.

 

[vitamin diesel]

Update. I got ae in today.
Hooked it up and the first things it pulled was:
P1280 icp sensor circuit low
P0123 intake air temp circuit high output
P0344 cps sensor a circuit intermittent (bank 1 or single sensor)
P1210 icp higher than desired (engine off)
P1211 icp higher/lower than desired (engine running)

I've replaced the cps from one at ford yesterday so I'm sure that's just a lingering code that needed cleared. But the issues still remain.
Icp pressure stayed at around 580 during idle and would bounce up to 2300 while on the go pedal
The icp duty cycle stayed down in the 5's while idle and would jump around to about 12 at 50 mph and intermittently jumped to 28 back down to 5 while off. This.. almost sounds normal.

I've got it chipped, it was off for testing and none of my symptoms really showed up while driving. Like I said before, stalling while taking off from a red light, no power, a lot of bucking.

Another note, I also ran the koeo and it popped up with the "open banks" both sides.
The cylinder controbution test came back normal and the buzz test kinda gave me the idea 4 and 6 whre a little weaker then the rest.
Anyone able to give me a little ensight on my problem? I'm stuck at FT dix and wanna get home to pa, but don't wanna leave till I get this thing tackled. Thanks,
Chuck.

Also, I probably should've mentioned this. The truck actually ran for an unknown amount of time withouttt the big metal cylinder that slides on the back of the ipr. The piece that has the pig tail attached to it. I've got an ipr and icp shipped on the way. Thanks again

 

[RT]

That big metal cylinder is the coil. It energizes to move the plunger inside the IPR valve. If the cylinder isn't firmly situated by the tin nut on the back, it will give you all sorts of codes and running issues.

If it were me, I'd clear all your codes first. Then get the IPR coil in place (or just replace it) and then run the scan again. That will probably clear up everything.

 

[vitamin diesel]

I ordered the rebuild kit here two weeks back and put it back on with a new nut and spacer. All these issues popped up after doing that unfornautally. I had hoped for the same thing.

 

[klhansen]

Update. I got ae in today.
Hooked it up and the first things it pulled was:
P1280 icp sensor circuit low
P0123 intake air temp circuit high output
P0344 cps sensor a circuit intermittent (bank 1 or single sensor)
P1210 icp higher than desired (engine off)
P1211 icp higher/lower than desired (engine running)

I've replaced the cps from one at ford yesterday so I'm sure that's just a lingering code that needed cleared. But the issues still remain.
Icp pressure stayed at around 580 during idle and would bounce up to 2300 while on the go pedal
The icp duty cycle stayed down in the 5's while idle and would jump around to about 12 at 50 mph and intermittently jumped to 28 back down to 5 while off. This.. almost sounds normal.

I've got it chipped, it was off for testing and none of my symptoms really showed up while driving. Like I said before, stalling while taking off from a red light, no power, a lot of bucking. Are you saying that it runs fine without the chip installed? If so, the chip itself is suspect.

Another note, I also ran the koeo and it popped up with the "open banks" both sides.
The cylinder controbution test came back normal and the buzz test kinda gave me the idea 4 and 6 whre a little weaker then the rest.
Anyone able to give me a little ensight on my problem? I'm stuck at FT dix and wanna get home to pa, but don't wanna leave till I get this thing tackled. Thanks,
Chuck.

Also, I probably should've mentioned this. The truck actually ran for an unknown amount of time withouttt the big metal cylinder that slides on the back of the ipr. The piece that has the pig tail attached to it. I've got an ipr and icp shipped on the way. Thanks again

ICP/IPR Duty Cycle at idle should be 450-650 and 10%-15%
Both should come up on application of the go-pedal, and if really loaded you should hit (ideally) 2400 psi with an IPR DC of 35% or less.

Check ICP volts with AE. Normal rnage is between 0.6 and 3.2V

Here's the info for some of the codes you got. You should clear them and recheck to see what pops back up.

DTC P1280 Possible causes:
-- biased ICP sensor/PCM
-- open ICP sensor circuit
-- short to SIG RTN or PWR GND on ICP sensor circuit
-- open in VREF circuit

DTC P0123 indicates AP (Accelerator Pedal) sensor circuit high input.
Possible causes are:
-- damaged accelerator pedal assembly
-- AP sensor may not be seated properly (tightened down)
-- damaged AP sensor
-- short to power in harness
-- damaged PCM

P0344 Check your CPS wiring

DTC P1210 indicates ICP signal voltage was greater than expected during KOEO On-Demand Self Test.
Possible causes:
-- biased ICP sensor
-- open ICP signal return
-- signal circuit shorted to power
-- damaged PCM

DTC P1211 above or below desired level under normal driving conditions.
Possible causes:
-- incorrect oil or viscosity
-- poor oil quality
-- gel fuel/no fuel
-- low fuel pressure
-- damaged IPR valve
-- high-pressure oil system leak
-- damaged high-pressure oil pump
-- damaged PCM

 

[vitamin diesel]

P1211 icp higher/lower than desired (engine running)

alrightt. i just got frustrated with some family issues and i packed up the truck and left anyhow. the chip was out the whole 300 mile trip. issues continued w/o it. however i did notice something interesting.
when i would start up a steep grade (they stretch for miles in pa) the icp duty cycle will climb and continue climbing until it finally caps itself out at 64.84%. it will not go any higher and it wont easily pick up speed once it starts. i feel like im driving a rig, once you lose the speed on an incline, you don't get it back.
once you start on the decline though it drops drastically which is where the code comes from. i timed it, and everytime it would go high and drop on the decline it would throw the code (im thinking from a sudden drop and AE reads this as a problem)

icp pressure on the other hand is good i assume from everyone telling me the defaults. pressure remains bouncy from anywhere between 700 psi to 2680 holding no particular pressure at any real given time unless really on the go pedal.

i found that out, but i still have no idea what any of it means. ughh.

 

[RT]

This might be a good read for you. Go to Diesel Technician Society and scroll down to the bottom where you find "Technician High Pressure Pump Guide For The 7.3 Power Stroke Engine"

What you are describing is the PCM having to give more and more juice to the IPR in order to achieve the desired ICP sensor level (injector pressure) - that would tell you the IPR is not working properly or you have a leak in the high pressure oil system (injector o-rings) - the ICP sensor appears to be responding appropriately.