Compression Ignition Addict
Join Date: Dec 2007
Location: Grimes, Iowa
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New motor, new injectors, 15min later rough idle
Looking for some insight as to which direction to look, 05 f250, new short block new ford heads, new (rebuilt) warren 155s stock injectors blue spring l, First start up of new engine motor popped off and sounded great!! No codes no misfires ran beautifully, idle time was limited but enough to verify everything was ok.. So we set out for the first test drive and before we hit the street truck developed a miss, thought maybe we had some air in the oil rails so we went around the block and miss never went away,
Cylinder contribution test showed number 7 had very low contribution, ran injector buzz test and no codes, next day took truck around the block again and still couldn't get number 7 to light up. Briefly checked conections and anything obviouse but found nothing.. I ended up unplugging #7 injector during idle and it made zero change in the idle..
So obviously I'm getting nothing from number 7, my question is where do I start, obviously I'm getting signal to the Injector as buzz test was good but I don't know why the injector won't fire, motor has never made any sound or negative action to indicate cylinder damage.. Or compression issues, it's just flat dead! I suppose I might swap 5 and 7 injectors and see if the problem follows the injector but was hoping someone might have a few tips or other things to try first before I tear back into it.. Thanks! Oh and FICM voltages are spot on!
09 F450 CC LB lariat 6.4 black on black 23k miles, stock.. (For now)...
97 F250 SC LB 4x4 7.3 05 Superduty axels, 18" King Ranch Rims, "under the knife"
Former 6.0 Owner. (05,05,03)