Join Date: Jul 2008
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early 99 major fuel problem
Ok heres my story last year i had a injector tip come apart and take out a piston. the truck has 240,000 miles so i figured good time as any for a rebuild. I did a complete rebuild with new pistons all bearings ect. The truck has run like a top until a few weeks ago i was driving down the highway with the cruise on and a started to hear a knocking sound that got worse very fast. The truck was smoking very badly white. So i shut the truck off and coasted to the side. I then restarted the truck and could tell it was raw fuel. the tow truck showed up and i tried to start the truck again and it was hydro locked. I thought it was a injector hung open causing the over fueling issue. The injectors were getting weak to where it still ran fine just didnt have the balls it use to. So i had rosewood rebuild me a set of injectors. I installed the rebuilt injectos had a heck of a time getting the truck to start (it would sound like it would hit on 1 cylinder here and there. no white smoke when cranking. I cranked it for a long time thinking i just had alot of air in the hpo system.) and it was running on 6 cylinders when it did start. I then ran a contribution test and found cylinders 1 and 3 not contributing. pulled the valve cover off inspected the wiring found it to look ok reinstalled and started the truck. It ran smoother than it has in a long time. It was sitting there idling while i was topping off the cooling system and checking for leaks under the hood. Then all of a sudden it started kocking real loud with a whole lot of white fuel smoke. I shut the truck off then went to restart and its hydro locked again. I'm lost. I did find what looks like a little oil in the coolant tank but didnt think much of it. I have no codes in the idm or pcm. i'm pulling the valve covers tomorrow to find which cylinder is hydro locked. The way it didnt want to start after i put the injectors in makes me think its a electrical issue. Any one ever see a idm or pcm cause a issue like this? With these new/rebuild injectors and the same thing happening again that it did before i have a hard time condeming the injectors to being bad. I'm lost with this one. I'm a diesel tech a ford dealer and do driviablity on 6.0s and 6.4's all day. This is my personal vehicle and i got in the dealer game late enough i dont play with that many 7.3's at work. There so much simpler than a 6.4 but i cant figure this one out and its driving me nuts.
I have a idm and pcm that i might try to throw in it after i figure out what cylinder/s are hydro locked and dont see anything obvious. I've never had any problems with injector cups. Are they even a possibility?
Again guys im lost. The more i think about it it sounds like a idm/pcm issue but then i dont see how it would hold the injector open to hydro lock it.
Sorry theres alot of thinking out loud there any help is greatly appreciated.
Early 99 F350 4x4 crew cab long bed
-bully dog 6 pos.
-leveled with 35's