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Hope this helps I had it posted in the problems forurm I replaced # 3 at 157,817 miles, then # 4 at 158598. # 3 had issue of vibration/shudder between 1500-1900 RPM. # 4 just went out and started smoking heavy, it had hairline crack in the tip. Now after each injector replacement truck ran great. A month later the same symptoms same as # 3 with another injector. Been driving it for a few months. Symptoms a choppy and erratic idle at times and shudder/ vibration around the 1500- 1900 RPM range on slight engine load ( uphill grades) always clears up after acceleration above 2000 Rpm but will hesitate for a bit then goes and runs like it should with some miss. Now I replaced all 8 injectors with Warren’s 155/30 a few days ago and seem to have an issue with the same symptoms as when # 3 went out, It will shudder/ vibration around 1500-1900 rpm but after that it runs really great like it should with a lot of power now I haven’t loaded any custom tune for the injectors yet, was waiting to purge the air out of the system and see how it ran. I have about 650 miles on it since I replaced all 8 injectors and have done several WOT runs for a short time to try to purge the systems (fuel and oil), and just today I shut it off while stopping at a store and then it had a long start issue, after a few key cycles it started up with some cranking, does this mean all the air is not out yet? That would be my guess. I took great care on putting in Warren’s injectors, as I wanted it to run like it should. Is there anything else you guys have come across that would resemble this? I run an SCT Livewire TS and monitor the things I need to everything checks out on the monitor with no codes, but I realize the SCT does not read codes that well so I think I going to buy an AE scan tool and I don’t know fuel pressure reading yet that’s next week, but at WOT it is great really a lot of power. Is possible that between 1400- 1900 it is not getting the fuel pressure? I don’t think so as I think at WOT if it the was Fuel Pressure was weak that is where I would notice it but it really runs awesome above 2000 rpm with the new injectors, And we can rule out the return to stock verse SCT tunes cause I tried that and my tunes are custom not canned. UP DATE -Got my Driven Diesel adapters and test gauge today - Fuel pressure results Key On 62 PSI , Cranking 58- 60 PSI , Hot Idle 62 PSI , Light acceleration/grade 60-62 PSI, The grade is where the vibration/shudder is most noticeable. So clearly it doesn’t seem to be a fuel pressure issue or am I missing something? Anyone have fuel pressure numbers so I can compare reading s? I will get more readings tomorrow, maybe some WOT Here’s my truck info any advice would be helpful Thanks.
2003 F-350 6.0 about 168,000 miles on the OD Warren’s 155/30 Injectors PowerMax Turbo/Billet wheel SCT Livewire TS with Vivian’s Looney Wild, Looney and Street
MBRP- 4inch exhaust straight piped
APR Studs New Oil Cooler(updated ford version) EGR Delete S&B Intake with Zoodad plus mod PVCRelocate Blue-Spring mod 6.4 Banjo Bolts Zooda Mod Upgraded Battery cables ( 2/0 ) Coolant flushes with Restore and Restore Plus CAT ELC Coolant Filter Always synthetic 5-40 and Ford oil and fuel filters
Last edited by BP-1; 01-10-2014 at 03:11 AM.