6.0 low power complaint

[Buddy_M]

OK guys, just want someone to tell me if I'm thinkin right. This customer has 2 trucks, one is a 2006 F550 the others a 2007 F550. Both trucks are identical type chassis', and same utility beds. The 2007 has a complaint of low power for about the past month. An EGR delete had been installed so the EGR system is not at fault. Going thru the performance diag sheet, everything is checking out, no codes being set.

 

Heres a few of the pids I have monitored, ECT 167, EOT 214(yes an oil cooler has been recommended), FICM_L,V,M 13/13/48, fuelpw 1.1ms, EBP 28psi, no change in power with exhaust disconnected either. ICP at hot idle, .87V 576psi, ICP_DES 580, IPR 23. To compare, both trucks, all pids read identical except for MFDES. The good truck for comparison was reading approx 10, and the truck with the complaint is reading 12-14. This is making me think injectors are not spraying correctly or delivering an adequate supply of fuel, because there is also white smoke and a rough idle issue with this truck, and just wanting some extra input before recommending a full set of injectors, or even trying one bank of injectors to see if it helps then proceed with the other side if it does help correct the complaint.

[Steve Mutter]

If crankcase pressure is under spec. and a manual compression test shows good cylinders. I would check this especially with the white smoke and rough idle. Do you have combustion in the fuel rails. Does it have the blue spring updated fuel pressure regulator? That would be a good sell as well.

[Bruce Amacker]

Fuel pressure under load is?

 

IDS shows what cyls weak?

 

Fill the secondary FF with Stanadyne and see how it runs.