Join Date: Dec 2008
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Posting to this old thread because I had the exact same problem with my truck. Replaced four non-working injectors on the passenger side (1,3,5 and 7) with serviceable ones I had as spares. Service engine soon light on and off intermittently and the KOER Test producing a DTC P1316 (ignition diag codes and the buzz test throwing a P1275 (#5 high to low side open). Swapped the #5 injector solenoid with new, no result. Checked UVC harness OK, VC harness to IDM wiring OK. Followed the Ford Manual Pinpoint tests to it telling me to replace the IDM. I decided to swap the #5 injector for another spare I had on the shelf rather than spend the high dollars on an IDM. Runs great now no more codes or problems. Turns out that a hydro/mechanical fault with an injector can throw a P1271 through P1278 code..
2000 F350 DRW, 6 Speed, 10' Dump Flatbed. Edge Juice with Attitude, 586-903 GPR, Zoodad Air Mod, EBPV Exhaust Brake Mod, Regulated Return Fuel System,
Last edited by dvjv; 08-18-2010 at 12:53 PM.