I have a 2001 F-550 that I am having a issue with injector High to Low codes, I have replaced the Injectors 2 years ago but only have about 10,000 miles on them. This truck is a service truck for a local farmer and he has had the following done here in the past 2 years...
Injectors, Turbo, new exhaust(4"), new PCM and engine compartment wiring harness, new engine( that is why it is hear), new High pressure pump with IPR and ICP.
I installed a new engine because he sucked the air filter up into the air tube and dusted the engine, lots of blow by, the engine is a jasper and I installed a new engine wiring harness, here is the problem I am having. I have three IDM's here, one is the orginal that he replaced, then one that is from Diesel select, and a master pro IDM from oriely's. I get a check engine light on when driving this truck only when I give it throttle under load then I let off and the check engine light goes out. P1316, check the IDM, buzz test, and here is where I get three different codes sets! Orginal IDM P1271,P1272,P1276,and P1277. Diesel Select IDM, P1271,P1272,P1273,P1274,P1275,P1276,P1277,and P1278. O'reily's IDM P0274,P0279,P1276,P1277,P1291,P1293,P1294,P1295. As you can see I am very confused with this, I have a set a 8 injectors here and plugged in a new injector into the #5 wiring and with the Diesel select IDM that code(P1275) goes away, perfect so I replace the right side bank injectors along with the under the valve cover wiring harness..... Buzz test I still get those Injectors expect 5 codes( P1271,73,77). I didn't think it was an injector issue and still don't but I need a little guidance here. I know I a missing things that I replaced so fire away and maybe we can get this handled for my customer, Thank you!