Fist off,let me say I have been lurking for the last few days,,,what a wealth of information,,great site!!!
Hopefully you guys or gals can help me with my problem!

The pedal was feeling "spongy" the other day headed home from work,so I changed the fuel filters about 4000 back, but figured what the heck, and I got some new ones and changed them. Drove down to the gas station,,ran great!!! Got back in after $105 bucks worth,,and no responce from the pedal at all,,,,time for a new throttle positioning sensor,(gas pedal) next day,bolted it on,,Ran Great!! went on to work next morning,,got to the stop sign,,,no pedal responce,,,idled into a drive way,,shut it off and tried to restart about 6 times,on the 7th,started right up,pedal came back,,went to work,,after work,,same,, no pedal,,about 6 more times,tried on the 7th time it started up,pedal came back to life,,drove home,,,got on this site and started reading the information here,,what a bunch!!!! and Thank you a bunch!!!

Finally decided to replace the cam positioning sensor,,,$40 bucks later and 600 cuts to the arm,lost 4 qts. of blood,,,but ran Great,,until tonight

went to go get a pizza about 2 miles down the road and before I shut the truck off I noticed the pedal was spongy reacting and when I got to the parking lot,,the tach was flucuating about 100 rpm down and 100 back positive of normal idle,,,when I came back out with pizza in hand,,,no start or pedal,,,cranked about 4 times,,on the 5th it started,,the pedal comes back to life,and I drive home,I am at my wits end,,,I feel like it is electrical,,but don't know where to go to from here

I don't have a scanner,but no CEL is coming on either,,,

this is on a 04 F250 FX4 loaded, that is as clean as a whistle,,92000 with the fluides changed on a regular bases
you can eat off the engine and I pull a 28'TT as I travel to work away from home,( live in Weatherford TX,Work in Beaumont TX)

sorry for the long winded post,,but I need some advice before I give in and take it to the dealership for a true beating!!!

Thank you inadvance for your time and knowledge,,,Tommmy

 

you could have a cel with no light
go to autoparts store they scan for free

I use this
www.scangauge.com
you need some kinda gauge

I would check the ICP volts and IPR make shure the hpo system is ok

 

Thank you for the quick responce,ICP? just to add,,when this happens,the truck idles just fine till you kill it,when you do kill it,,it won't start again till the pedal comes back to life,,I will read up more to find out how to check the ICP,,Thank you and I will get back when I know more

 

Finally got frustated and carried it to the Ford Dealer and by the time I got back to work, they called to tell me it was the ISP,,,,$496.38 later,($88.00 was diagnostic machine) it is fixed,,they have been driving it for over a hr with no problems!!! Yes it is a little exspensive,but my arms are thanking me!!

Thank you for the advice and wealth of information on this site,,,I will be lurking a lot

 

Blade, looks like you nailed it...

 

ISP? Please, what does that stand for?

 

typo O would be my guess...
icp sensor.

 

Thats what I figured, but I was not sure, always looking to learn something new.

 

ICP,,sorry for the type o,,,Break down time for those interested:
1- diagnostic test $88.00
1- 4CZ3*9F838*A SENSOR ASY $150.00
1- 5C3Z*12224*A CONNECTOR $ 83.18
LABOR $176.00
MISC SHOP SUPPLY $26.40
RENTAL CAR $41.53

But it is fixed and running great,, hopfully for another 90k!!!!!

 

Mine is doing this... can someone give me more info on the ICP Sensor? like what those initials stand for and where it is?

 

The Injector Control (P I don't know) is on the right hand valve cover in the front, it is a sensor for the high pressure oil pump that tells the injectors how much fuel to dump in the cylinder I was told,,and I could only find them at the Ford Dealership,,, Hope this helps

 

ICP= injector control pressure

this sensor monitors HPO= high pressure oil and sends info to pcm to control the IPR [ injector pressure regulator]

2006 is in the passenger valve cover IIRC

have you scanned it for codes

 

try partsguyed.com for the sensor.

 

Scanned for codes and got none... Actually found some info on this after I posted... Went to my local lincoln dealer and picked up the ICP and pigtail if anyone is interested dealer cost is $112.50 on the ICP and $62.39 on the pig tail. Gonna put in the sensor today and see if that solves the issue...

 

As for the pig tail, does anyone know why it gets replaced? Is there a bad crimp on it you're suppose to cut out, or do they melt? Whats the issue there...