My 05 F250 has the jerking/studder at 45-55 MPH and miss at idle. I believe I've posted about this before. I've been doing alot of reading on the jerking/studder issue. I've seen repairs ranging from injectors to ICP sensors to HPOP leaks, etc.

My jerking/studder does not occur all the time. 99% of the time, the first startup in the morning is perfect and the truck runs the best that first startup. The truck gets to operating temp before I get to work and rarely jerks/studders at the 45-55 MPH and rarely misses at idle. Now, when I leave to go to lunch or leave to go home for the day, once the truck starts to warm up is when I begin feeling the jerking/studdering and miss at idle. One day it got so bad, I took it out onto the interstate over lunch and blew the cobwebs out of it for 15 miles. When done the jerk/studder and miss was gone until I restarted the truck after work again.

I cleaned the EGR valve about 300 miles ago when I replaced my egr hose and flushed my coolant. Wasn't really that dirty.

I will be pulling a 28' enclosed snowmobile trailer out to Colorado from Omaha in 4 weeks and wouldn't mind having this issue fixed by then.

I am leaning towards an injector but wouldn't a bad injector create the jerk/studder and miss at any operating temp and wouldn't a bad injector create hard starts in the AM especially when temps are below freezing.

The good cold starts happen whether truck is plugged in or not.

BTW - I only have the normal white smoke first thing in the morning.

What do you guys think I should try?

 

Anybody have any suggestions?

 

do you have any gauges a SGII or anything

have you scanned for Codes

Your going to need something to monitor the truck with

an AE would be the ticket

A SGII would be better than nothing but you couldnt do a cylinder balance test which would be needed to spot a bad injector if you even have a bad injector

Intermittened problems suck and can be a royal PIA to diagnos. And judging by your post it doesnt seem like theres any rhyme or reason to it. maybe worse when the ambeint temp is warmer for your ride home IDK hard to really pinpoint anything at this point.

Any recent work besides the egr valve cleaned
Motocraft oil filter
fuel filters changed
ever had anywork done to the HPO system
Check the FICM hows the voltage

I just think some diagnostic equipment would pay for itself here

have you gone threw this

https://www.ford-trucks.com/forums/9...condition.html

 

~300 miles ago I replaced the egr to oil cooler hose and flushed the coolant. Coolant was flushed using VC-9 and 22 gallons of distilled water using the no thermostat option.

Oil was changed using Rotella T6 5W-40 and motorcraft filter ~1000 miles ago. I change the oil every 5000 religously. This is my first time running full synthetic but I changed to that to try and help the problem.

Replaced fuel filters ~4000 miles ago using Racor filters. Truck was doing this before then also.

Nothing has been done to the HPO system that I know of. The truck blew an injector ~21000 miles ago - it blew the o-ring apart on the top of the injector. Ford replaced with a new one. They originally thought it was the STC fitting in the HPOP until they found the injector while disassembling to replace the STC.

I just checked the FICM using my SGII last week. Numbers were spot on at KOEO, while cycling, and while starting/running.

I'll read through the low power condition thread and see what I can find.

Thanks

 

Why did they pull the valve covers to get at the HPO pump?

Shooting from the hip a bit, but the IPR valve, ICP sensor, and EGR valve are the most plausible suspects.

 

Well, here's how it went down. The tech was suspect of the STC fitting. When I arrived to watch him work on the truck he had already torn it down so far. He then decided to hook air up to the ICP port. You could easily hear and see a light mist spray coming out of I believe it was the oil fill tube. That was when he determined it was an injector.

How do I check the IPR and ICP? Is it somewhere in the 6.0 Bible? Can my SGII do it?

 

oh you have a SGII

yes it can see the HPO program the ICP and IPR%

ICP

IPR %IPR Duty Cycle TXD: 07E0221434 RXF: 046285140634 RXD: 3008 MTH: 0DCA03E8000A NAM: IPR %

Then check these numbers ar hot Idel

and IPR% at KOEO to

and post results high IPR% is likely a Leak


whats SGII showing for Ficm volts

 

 

im curious to see what you got goin on...

 

theres not a IPR value for WOT

all values are taken at KOEO-LOWW IDEL (600rpm)-and HIGH IDEL (2500rpm)

Well the HPO system looks GOOD no leaks exact numbers you would want to see

Have you tried to read the codes SGII will show generic codes but usually the cel has to be lit to

If SG comes up empty on codes you might try and run by an auto parts store and scan with there code reader

Im thinking it maybe an injector problem But lets check all we can with the SG First and hope something POPS UP

Now lets look at MAP,EBP,BARO at ( KOEO ) all values need to be within .5psi

 

which xgauge is the BARO?

 

hang on having a hard time finding it

I will find it I have it on my SG just not in my notes

 

Try this one its one of the eairly x-codes so if it dont work let me know

Im thinking you should get around 14-15 psi BARO at KOEO

Baro 07E0221127 046285110627 3008 000A00080000 BAR Inches of Mercury

 

PM sent!!!

 

Here's what I got:

Cold first startup

BARO - 28.3
EBP - 14.4
MAP - 14.1

Hot after getting to work

BARO - 28.5
EBP - 14.4
MAP - 14.2

Obviously BARO is way out of spec. What does this mean?