hey guys, wanted to pick your brains if you dont mind. I've done alot of reading up on here and just can't make my mind up.
my truck is a 04 6.0 with 200k. I just bought it a couple months ago at a pretty decent deal. I've straight piped it and added a 75hp program after the skipping started hoping it may cure it , no go . It started only while cold and once warm it would quit. Now it pretty much skips at any temp. Its does it the worse when im in 5th gear (automatic) and normally cruising round 55 . It will buck and jump little at certain rpm or where i hold the peddle. I can let off or mash it little harder and it will stop.
I took it to friend of mine whoes a decent mechanic but no 6.0 expert. we hooked it to his snap on monitor and ran test after test, killed each injector one by one. Nothing. No codes, No bad injector readings. What we thought was odd is that the Ipr Valve never moved above 25 on his machine when revved up. He could manually turn it up, 30,35,40,45 and so on and the truck was going nuts. we could turn it back to 25 and rev it up and it would stay on 25. does this sound like it could be my issue or something else?
I tried revv -x . It cured it for a day. 66 bucks wasted. I use lucas injector cleaner and diesel clean in different intervals with no success. Schaeffer Oil is what im running.
Thanks for any info someone may have
im going to help you out here buddy I just picked my 04 6.0 up from the shop today, it was skipping, and skipping bad when your in last gear does the truck shake real bad, I actually have been though this a couple of times, the first 2 times it were bad injectors,, this go around I had 2 broken rocker arms and 2 bent push rods, what happened is my wiring going to my vgt short circuited and I guess I gave it to much fuel to compensate for it and went into a over ref situation , both rocker arms snapped and 2 push rods bent, and they all were on the same cylinder, im not saying you have a broken rocker arm, im just going to give you a run down on what it could be, bad injector or injectors, either on the mechanical side or electric side, lets hope it's just bad injectors, broken rocker arms, bent push rods this isn't a major repair if that's your issue, worst case scenario is a bent valve or bad piston or rings, i have a question for you do you have any kind of noises at idol when you turn your steering wheel or press the brake petal hard i can't stress this to you enough don't drive it skipping because your going to end up causing damage to your truck, im no diesel mechanic , but i know one of the best around, and we have been though a lot together when it comes to my truck, get your truck checked out asap, i hope its just a minor issue for you, and some times injectors can go in or out which cylinder is skipping, what codes are in the truck,, i will help you anyway that i can, because i know the frustration that comes with your truck no running right have been their time and time again, if you eliminated the injectors, then you problem lays within the motor, if you have a cylinder skipping their will be a code, is their any white smoke , you need to get a buzz test done on them injectors, if your located in nc,, i can recommend the best mechanic around,, everything that i have listed will give a contribution code, stop driving your truck until you fix buddy i would hate to see another 6.0 engine go down, it is possiable your hpop is going bad, but that also will give a contribution code, let me know how things turn out, ohh yeah when my ipr started going bad, the truck was hard to start and they was no skipping at all, and when it went completely out the truck would not start, also if it was bad their would be a code for that,,, im not saying it's not possiable, just everything your going though i have been though,,,,,,, Roger,,, early 04 f350 6.0.. new pistons rings. rod bearings. lifters, new intake exhaust and head gaskets with arp head studs , egr delete, 4 in turbo back straight piped, blue spring mod, new ipr, new radiator , valve job done to trucks, just had 2 rocker arms and push rods installed, and their is al kinds of stuff that i can't even think of,,, good luck friend keep us posted