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possibly the injectors?

1718 Views 8 Replies 3 Participants Last post by  RT
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,

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

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
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