Detroit Dan
New Member
I looked thru the diagnostic checklist, didn't see anything similar.
Towed my big camper last weekend, was difficult getting it up the little hills due to a sputter I encountered. If I held the throttle open enough to try to keep it from losing speed, it acted like the fuel was getting shut off and turned back on quickly, every few seconds. If I let off it immediately went away. And it wasn't like a steady sputter, it was just an individual buck repeated every few seconds. Not what I think of as fishbite, and that's more a PMD problem isn't it? I have pulled this trailer up to the mountains with some real hills, and while it slows drastically and heats up and falls on it's face, limping over the top at 40, it has never done this before. I'm actually glad this trip wasn't to the mountains, because I doubt that I would have made it up the real hills.
I replaced the fuel filter, but the old one didn't look bad. No SES light, so I don't think there'd be any codes. I also don't think it went into limp mode, because normally if I stress it too much the SES light comes on and stays on for a couple days. But I'm not sure about limp mode, I can't really tell when it's loaded.
I thought maybe the computer was detecting high air intake temps and cutting back fuel, but never seen it do it in such a way that would make the truck buck like that.
I do have gauges, however my EGT gauge is not hooked up after replacing exhaust, new system didn't come with a bung. Need to get that taken care of. In the past, with 3" system EGTs never got over 1000 or so pulling hard in the mountains, so I've never worried about EGTS much. My boost was reaching 13 and staying there, when the truck is empty I can't get it much past 10, which is where I set it. I thought about dialing the TM back to 10 while I was loaded, but it was only a short trip. Also, the water temp got high a couple times, like it usually does, but came back down, and wasn't at all synched to the bucking, it occurred even when the temp was under 200.
In the last 2-3 years and 20-30k miles I've done the lift pump, remote Dipaco PMD, stock Bosch injectors and 60gs, air filters clean, cleaned CDR a couple times, pulled radiator, flushed and pressure washed it, replaced fuel tank last winter and sock was fine. I've never touched the timing.
While changing the filter I noticed that the EGR or whatever it's called, the little 1 inch line that goes back into the air intake just ahead of the turbo had more oil pushing out of it. It's always had a little oil there but it seemed worse.
Feels like either fuel delivery or computer cutting back, but I don't know. I guess I should think about checking fuel pressure (need to learn how), any other ideas?
I've been wanting to do an ATT and a Heath GL-4 (in that order), but I don't want to spend that kind of money and still have this same problem. Don't know if either will correct the problem. I'm certainly not going to try to take the camper up north this summer if I can't fix this.
Towed my big camper last weekend, was difficult getting it up the little hills due to a sputter I encountered. If I held the throttle open enough to try to keep it from losing speed, it acted like the fuel was getting shut off and turned back on quickly, every few seconds. If I let off it immediately went away. And it wasn't like a steady sputter, it was just an individual buck repeated every few seconds. Not what I think of as fishbite, and that's more a PMD problem isn't it? I have pulled this trailer up to the mountains with some real hills, and while it slows drastically and heats up and falls on it's face, limping over the top at 40, it has never done this before. I'm actually glad this trip wasn't to the mountains, because I doubt that I would have made it up the real hills.
I replaced the fuel filter, but the old one didn't look bad. No SES light, so I don't think there'd be any codes. I also don't think it went into limp mode, because normally if I stress it too much the SES light comes on and stays on for a couple days. But I'm not sure about limp mode, I can't really tell when it's loaded.
I thought maybe the computer was detecting high air intake temps and cutting back fuel, but never seen it do it in such a way that would make the truck buck like that.
I do have gauges, however my EGT gauge is not hooked up after replacing exhaust, new system didn't come with a bung. Need to get that taken care of. In the past, with 3" system EGTs never got over 1000 or so pulling hard in the mountains, so I've never worried about EGTS much. My boost was reaching 13 and staying there, when the truck is empty I can't get it much past 10, which is where I set it. I thought about dialing the TM back to 10 while I was loaded, but it was only a short trip. Also, the water temp got high a couple times, like it usually does, but came back down, and wasn't at all synched to the bucking, it occurred even when the temp was under 200.
In the last 2-3 years and 20-30k miles I've done the lift pump, remote Dipaco PMD, stock Bosch injectors and 60gs, air filters clean, cleaned CDR a couple times, pulled radiator, flushed and pressure washed it, replaced fuel tank last winter and sock was fine. I've never touched the timing.
While changing the filter I noticed that the EGR or whatever it's called, the little 1 inch line that goes back into the air intake just ahead of the turbo had more oil pushing out of it. It's always had a little oil there but it seemed worse.
Feels like either fuel delivery or computer cutting back, but I don't know. I guess I should think about checking fuel pressure (need to learn how), any other ideas?
I've been wanting to do an ATT and a Heath GL-4 (in that order), but I don't want to spend that kind of money and still have this same problem. Don't know if either will correct the problem. I'm certainly not going to try to take the camper up north this summer if I can't fix this.
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