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Missing?? Injectors?? Codes?? Help....
i am new to this forum and am looking for some advice in which direction to go..
i have an 03 f250 cc swb 4wd 6.0
it has sinister egr delete, 4" exhaust turbo back no cats, sct tuner, just had new fuel spring, arp studs, oem gaskets, new heads..
truck was having some missing issues before going into the shop, after job was completed the truck ran excellent for abt 1000 miles, then it has started acting up again, here is what we have going....
i am know getting constant miss even after warmed up, so i took it to mechanic last night to have him check ficm, he went to drive it and said wow this things missing bad, w truck warm, it was as 48.5 dropped to 47.5 cranking.he ran codes came up w P0237, P0272, P0403,P0480, P0528....
did injector diag, #4 was changing as low as -48 while the others remained at 0
he had me leave it so he could check it this am when cold. went over this am he hooked it up, ficm - lowest it was was47.5 cranking and stayed at abt 48.. so looks like ficm may b okay..
injector diag showed #4 #6 #7 all dropping to negative numbers jumping all over the place, he suggested we use the bg clean system, one qt treats fuel, 2nd treatment goes directly in the oil, stuff was like alcohol, let set idle for 1.5 hrs, drained and purged system, new oil filter and royal purple 15w40 and 1 qt of bg DOC, diesel oil conditioner......went and drove truck was still missing a little..
he had reset the codes earlier but the codes came back showing #4 injector, told me to drive it for awhile to work in the fuel treatment, upon driving it will clear up and run great then start the miss agn under acceleration, then clear up agn....
thats where i am to this point...
last night after leaving work have the same problem, missing very bad cutting out until it warmed up, then still has a miss....
we are stumped and looking for some help, thnx in advance