RyanG

anybody run into this issue yet. 2011 6.7 cab and chassis f350. longer than normal cranking time. p0087 low fuel pressure stored. ran all pinpoint test checks, found no issues. truck runs great, 230,000 miles. removed fuel pressure control valve and volume control valve, no contamination, good clean fuel in tank- tank and low pressure pump replaced 15000 miles ago for delamination. replaced both vcv and pcv and still have same issue. fails high pressure fuel system test every time. im a little fuzzy on the cylinder balance pids. pinpoint test asks if they are relatively close to each other. all 8 are between +/- 0.00 and 0.02, that seems pretty close to me. relative compression and power balance look great. Im wondering if high pressure pump is on the way out, anybody have any ideas or possible things im overlooking. low pressure fuel system is showing 60 + psi under load after secondary fuel filter.

Well tore the head off, we have polished cylinder walls. took a fuel sample from cylinder 2 injector pipe, fuel system has metal particles and the rockers on bank 2 have worn out tips, I would say this one is done. thanks for all the input guys.

pulled the cac tube off of the high pressure turbo, reran crankcase pressure test and it passes. pulling heads per ford, I will let everybody know what I find.

that what I don't understand, I wasn't controlling vgt or with ids, I just revved the engine to 3000 and watched the gauge

well guys ran manual compression test one last time cyl.1 - 400 cyl.2 - 360 cyl.3 - 380 cyl.4 - 380 cyl.5 - 360 cyl.6 - 380 cyl.7 - 380 cyl.8 - 365 im gonna pull valve covers and look at rockers. this truck has a fairly good service history up until a year ago, came in with napa oil filter. wondering if I have polished cylinder walls. I'll let everyone know what I find. when you guys saw fuel trims creeping up on 2, what was the outcome when you pulled the head? polished cylinder walls, burnt rings? this may be a stupid question, on the crankcase pressure test, noticed boost gauge on the cluster was at 20 psi. is it normal to see boost that high with engine unloaded? ive never paid attention. like I said have not done much 6.4 in depth diag. guess Its gonna happen now that these pigs are getting older.

thanks for the input. did notice sludge build up, I have seen worse at high pressure outlet. another question I have is this truck has a tuner and dpf delete, ran relative compression, cyl. 2 is showing down 4%. ran manual compression test again at operating temp, all cylinders bank 2 at 365 psi, all bank 1 cylinders at 380-385 psi. pressure is within 25 psi max separation spec. relative compression test on 6.4 not reliable? like I said im getting +12 to +13 on stft on cyl. 2 with no contribution codes. throw in an injector? possibly the cause of p252f?

truck came in with p252f, checked oil, slightly overfull like they all are. checked high pressure pump leaking from oil pan, ran high pressure pump at 24000 with raised rpm, no oil level rise. coolant level good. checked for excessive oil in cac, no issues. noticed excessive crankcase pressure from oil fill, ran test, showing high 20,s to 30 in h20. fuel trims ok except cylinder 2, creeping up to +15 when warming up. relative compression shows cylinder 2 down sometimes as much as 6%. ran manual compression test, all cylinders bank 2 around 360, cylinders on bank 1 are 380 and 390. tech line is telling me turbos for crankcase pressure issue possibly pressurizing crankcase, checked turbos don't have excessive play, don't see oil. im stumped. have not done in depth diag on these engines except for the usual catastrophic failures, radiators, front covers etc. any insight would be appreciated.