Mikehammond
New Member
Hi, I'm new here, first time poster. Il start with some history on it. My father inlaw bought this truck in 98 with around 25000km, and I bought it from him in 2008 at 112000km. Dually is now just under 150000km, and I only use it in the summer, mainly for towing my 24ft travel trailer, I'm guessing it weights around 6000 lbs.
So the problem I'm having isn't quite intermittent, but almost like a timed event. Il leave my home towing my trailer, for the first hour or so everything is great. Good power, haul 120km/h no problem on flat highway and keep it over 100km/h (65mph) up hills. I have gauges and bumper mounted 3" intercooler. so typically if everything's going good il read about 7-9psi boost and 650-800 egt on flat highway. On hills, she will read 13.5-15psi boost and I've never seen it rise over 1150-1200 egt's. I usually travel to the same destination, and about 1 hour into my trip the problem occurs, at the same location I drive into some longer hills, but nothing serious. Anyway, it's almost as if it's going into what I believe is called a, 'secondary limp mode'. The truck will gradually slow and slow going into the hill, it will eventually shift down into third gear. And I'm usually only doing about 80-85km/h (50mph ish) by the time I crest the hill. During this problem boost is usually 7-8psi. Maybe sometimes 9psi, and I can only produce about 750-800 egt's. No black smoke, this truck never ever smoked. The truck will not exceed those values the remainder of the trip, and I eventually come into some steeper longer hills where it will dip down to 70-75km/h (40-45mph). The cruise control is functional and trans will still lock up during the problem. No check engine light will illuminate. My truck has a healthy cooling system and gauge barely moves from normal operating temperature when working hard. Transmission shifts and operates mint and trans temp gauge stays around 160f average. This problem has been ongoing for a few years.
Since I've owned it I've replaced the lift pump and removed filter manager and completely cleaned including screen. Bumper mounted dtech pmd with heat sink #9 resistor. ( I have a spare black stanadyne pmd and have tried it with the same problem resulting). 3" straight pipe exhaust turbo back. Original crossover pipe. Replaced ignition switch. Removed rad, oil cooler and cleaned between. (Surprised how much junk was in there). Came stock with HO water pump and dual thermostat housing. Thermostats replaced. Replaced intake gaskets. Replaced full vibration dampener and front main seal. I've cleaned all engine grounds. I run Amsoil 15w40 and I change the fuel filter every second oil change, and run stanadyne diesel fuel additive. And I mounted the 3" intercooler 3 years ago, I had originally thought that maybe the Intake air temperature had been causing the pcm to defuel in the hills. It felt awesome after, but like I said, it felt like it got weaker down the road, so installed the gauges. I'm sure I forgotten some of the stuff I've done to it. But it's still running the original IP and injectors. But I don't think that's the problem.
One funny thing is that the last trip home I did it acted like a biatch the whole way with the problem. I got home, unloaded my trailer. Drove to the fuel station, I filled it while it was idling. I got back on the highway and I had full power again. Fuel cap maybe? Haha. But I've never noticed a vacuum noise when I've spun of the cap, and it's usually not running when I fill up.
I've never pulled over and done a key cycle to see if it goes away. But where I go camping the truck usually sits for 3 days, and still has no power on the way home. But then next time I haul my trailer. It's the same story over again.
And I realize that I need to get a scan tool and see what's going on while this is all happening. But I just figured I'd throw all this down and see if anyone had any prior recommendations. I've spent hours searching the web, and have learned a lot of info. Just don't really see anyone with the exact same issue. Thanx in advance!
So the problem I'm having isn't quite intermittent, but almost like a timed event. Il leave my home towing my trailer, for the first hour or so everything is great. Good power, haul 120km/h no problem on flat highway and keep it over 100km/h (65mph) up hills. I have gauges and bumper mounted 3" intercooler. so typically if everything's going good il read about 7-9psi boost and 650-800 egt on flat highway. On hills, she will read 13.5-15psi boost and I've never seen it rise over 1150-1200 egt's. I usually travel to the same destination, and about 1 hour into my trip the problem occurs, at the same location I drive into some longer hills, but nothing serious. Anyway, it's almost as if it's going into what I believe is called a, 'secondary limp mode'. The truck will gradually slow and slow going into the hill, it will eventually shift down into third gear. And I'm usually only doing about 80-85km/h (50mph ish) by the time I crest the hill. During this problem boost is usually 7-8psi. Maybe sometimes 9psi, and I can only produce about 750-800 egt's. No black smoke, this truck never ever smoked. The truck will not exceed those values the remainder of the trip, and I eventually come into some steeper longer hills where it will dip down to 70-75km/h (40-45mph). The cruise control is functional and trans will still lock up during the problem. No check engine light will illuminate. My truck has a healthy cooling system and gauge barely moves from normal operating temperature when working hard. Transmission shifts and operates mint and trans temp gauge stays around 160f average. This problem has been ongoing for a few years.
Since I've owned it I've replaced the lift pump and removed filter manager and completely cleaned including screen. Bumper mounted dtech pmd with heat sink #9 resistor. ( I have a spare black stanadyne pmd and have tried it with the same problem resulting). 3" straight pipe exhaust turbo back. Original crossover pipe. Replaced ignition switch. Removed rad, oil cooler and cleaned between. (Surprised how much junk was in there). Came stock with HO water pump and dual thermostat housing. Thermostats replaced. Replaced intake gaskets. Replaced full vibration dampener and front main seal. I've cleaned all engine grounds. I run Amsoil 15w40 and I change the fuel filter every second oil change, and run stanadyne diesel fuel additive. And I mounted the 3" intercooler 3 years ago, I had originally thought that maybe the Intake air temperature had been causing the pcm to defuel in the hills. It felt awesome after, but like I said, it felt like it got weaker down the road, so installed the gauges. I'm sure I forgotten some of the stuff I've done to it. But it's still running the original IP and injectors. But I don't think that's the problem.
One funny thing is that the last trip home I did it acted like a biatch the whole way with the problem. I got home, unloaded my trailer. Drove to the fuel station, I filled it while it was idling. I got back on the highway and I had full power again. Fuel cap maybe? Haha. But I've never noticed a vacuum noise when I've spun of the cap, and it's usually not running when I fill up.
I've never pulled over and done a key cycle to see if it goes away. But where I go camping the truck usually sits for 3 days, and still has no power on the way home. But then next time I haul my trailer. It's the same story over again.
And I realize that I need to get a scan tool and see what's going on while this is all happening. But I just figured I'd throw all this down and see if anyone had any prior recommendations. I've spent hours searching the web, and have learned a lot of info. Just don't really see anyone with the exact same issue. Thanx in advance!
