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Discussion Starter · #1 ·
I havea 2006 F250. The truck has recently had everything replaced...

in the last 5k miles:
new injectors
new turbo
new radiator
new stand pipe
new dummy plug,...

you get the idea. Prior to these repairs, I have had the following done:
full bulletproof kit
new trans
new ARP head studs
FICM...

So in teh past 2 weeks I noticed a miss at freeway speeds. It would fire up fine, run fine all around town. The minute it got up to operating temp on the freeway, the truck would start bucking like crazy. At times, the truck would have NO throttle response. I would let off the throttle and then hammer it and it would be fine under load. The minute I was cruising again, the truck would buck again. After a few days of this, the truck started having a hard time starting up when cold. The truck sat for a weekend and this morning it really had a tough time starting.

Fast forward to today. I was driving home doing about 70 when the truck just died on me. I coasted ot the side of the freeway, and tried ot fire it up again. No dice. It would crank for a while and nothing. Fine. I called a tow truck and in the mean time I would try and crank it again and hoped it owuld fire up. After the truck cooled down, it finally fired up (struggled to get started). I drove it home on city streets and it was fine. I came home and replaced the ICP sensor. I have not gotten it on the freeway yet, but it did have a harder time starting up, so I am a bit concerned that was not the problem.

Can anyone lead me in the right direction on what it can possibly be? I have an IPR sensor, but don't want ot tear into it unless the chances are pretty high it can be that.

Thanks for the advice.
Dima
 

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No start hot sounds like an HPO leak to me. Maybe even the HPOP itself, although the HPOP'S in the 2005+ rarely have problems.
 

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Discussion Starter · #3 ·
No start hot sounds like an HPO leak to me. Maybe even the HPOP itself, although the HPOP'S in the 2005+ rarely have problems.
So you are saying the STC fitting? Since I am going to tear the IPR out, I might as well replace the STC fitting as well right?

Thanks
Dima
 

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It could be a lot of things. Without diagnosis you are spinning a roulette wheel. Sure, if your chips are on red you've got a 49% chance, but you always feel dumb when it comes up 00. I would advise reading IPR and ICP values as a start. This should give you some idea of the overall health of the HPO system. I would look at them while cranking, and while driving through the ECT range. The hotter the coolant the thinner the oil, and the less problems like HPO leaks are masked.
 

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Discussion Starter · #5 ·
It could be a lot of things. Without diagnosis you are spinning a roulette wheel. Sure, if your chips are on red you've got a 49% chance, but you always feel dumb when it comes up 00. I would advise reading IPR and ICP values as a start. This should give you some idea of the overall health of the HPO system. I would look at them while cranking, and while driving through the ECT range. The hotter the coolant the thinner the oil, and the less problems like HPO leaks are masked.

How do I test all these while driving? I know I can test the voltage when parked, but it might be a bit scray to test while on the freeway hahaahha

Thanks
Dima
 

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You need a good scan tool. I use the Scanguage 2. It is not as robust as some of the others but it gets the job done and is only $160. If you mount the guage where you can see it easily without taking your eye off of the road then you will be able to watch the ICP and IPR numbers.
 
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