Join Date: Jan 2009
Location: Salt Lake City Utah
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Well not to hijack but after having the same symptoms as above (no power, violent idle), I thought I'd share my results of the last three days as well in hopes it will help somebody else. I started with ae, I had no codes, no check engine light, oil was at 600 psi at idle as it should be, everything looked great. I changed out fuel pump cause I didn't have a way to check fuel pressure (pretty much only thing not new on the engine) and it acts like its getting starved, besides its cheap and easy so I replace it. After the bottom of the pump breaks off in the engine and poppit falls in, and a day of retrieving it, I move on to the next thing. I recently had changed uvch and valve cover gasket and outside connectors after getting my stage 1's from rosewood, but had used crappy dorman products. My buzz test had the entire bank 2 sounding very weak, so I pulled the cover to check to see if they were firing, they all were firing, but I broke both clips when I pulled it, they literally disinegrated. (dorman is s##t) . So I've always wanted to replace the entire engine harness due to someone splicing the crap out of it. Got a brand new harness, installed it with new uvch's and gaskets, put everything back together. Drum roll.... Runs even worse shaking the entire truck smoking filling the entire city. Go to shut it off, and finally a check engine light. P1294 bank 2 . Swear alott.. Take back off the cover, find 3 injectors not firing, swear more. Start checking connections, ohm out everything, all good, swear more. Start it again, 2 injectors not firing, one of which was working when I just started it an hour before. More swearing.. Pull the main harness start checking continuity from the main plug in to each injector plug see if I got a bad harness, all had continuity. Finally realize its the idm as sldghmr just posted above. Pull it off and can here the water rollin around it. Cracked it open poured out 2 cups of water reinstalled, immediately idled great for a minute or two before getting rough again. New ones on its way.
UPDATE: Had the day off, pulled the idm apart, found two obviously burned resistors and a diode, soldered in some new ones, and the truck runs like a champ smoothest idle its ever had.
97 F250 HD 4X4 Powerstroke OBS 3.55gears E4OD
Banks fast spool 1.0
4" exhaust w/o kitty
E4od "the cure" (best product I have done)
Last edited by obs; 03-31-2011 at 03:37 PM.