close to giving up….

[Joe Johnson]

2005 FX4 four door cab shortbed single rear wheel….

rough idle…runs bad, seems to be missing out…especially at idle, or with the cruise control engaged.

replaced the IPR valve on the side of the hpop…replaced the STC fitting between the hpop and the branch tube….

monitoring live data KOER ficm voltage above 45…have seen it drop into the 37-40 range…with no change in the way the truck runs…

I deleted the egr and cooler 2 years ago

no DTC's

truck is well maintained

I have been reading about a "blue spring" update…but I can't see this being a fuel pressure issue?….

2 new Dekka Batteries via NAPA

any advice would be appreciated…

Truck is at my shop in Inianapolis, IN

I am using another mechanics Matco diagnostic tool to view data

I'm over it, please help

[Joe Johnson]

if anyone has better diagnostic tools and wants to pick up some cash, truck is on the south side of Indianapolis, IN…parked inside the shop at Peterbilt

[southend]

Ficm voltage below 45v is a fail. Get you ficm fixed. Ficmrepair.com Need to read icp and ipr% also.

Sent from my phone that somebody didn't help me get.

[Joe Johnson]

I went to the International dealership in Indianapolis and bought half of the FICM, they said it was the only part that goes bad…I replaced the IRP and did the STC fitting upgrade, replaced "dummy plugs" and stand tubes/pipes…runs better but still had a damn miss…no DTC's…I'm freakin' stumped, I guess it's an injector…but passes an injector test with a "Matco Pro Scan" tool….would having it reflashed with the latest software help?

[Tuscany]

When does it miss??

[southend]

Are you using motorcraft or racor filters with matching cap? Are you able to monitor icp, ipr%. The logic board does fail, rarely. It would be worth your time to check fuel pressure. Here.


Sent from my phone that somebody didn't help me get.

[Joe Johnson]

First of all Tuscany….that has got to be the best looking Super Duty I've seen, and I've been to SEMA twice…the miss is very noticeable right around 1200 RPM's…I have not driven the truck since these repairs have been made, kinda afraid I'll have to tow it back. I have not done the "blue spring upgrade" yet, but plan to soon…I wish someone with Ford IDS or better scan tool than I am using could come and give me some better insight. I am using motorcraft filter and cap, and fuel filters. I can monitor ICP and IPR%. What is the logic board?

[southend]

The logic board is the part international told you never fails.

Sent from my phone that somebody didn't help me get.

[Joe Johnson]

I see…FICM voltage is well in parameters now, and it seemed to have made a big difference. FICM sync is "YES" on scan tool. Do you still think I should look into the logic board?

[dhanna6powerstroke]

No need for logic board.