Hi All,
On my way from Montana to Calgary yesterday towing my 5th wheel, and this issue started. Trying to travel at 60 mph and it is a dog. The day prior there was no issue and it can easily go much faster than that easily (not that I travel regularly faster than 60 pulling the trailer).
I would attempt to go down the highway at 60, EGTs would be at 1150, boost at 20 pounds. Generally EGTs would be 1000-ish at less than 10 pounds. My boost line also came off a couple times which has not happened for probably 10 yrs.
I did fill up in Lincoln at about 3/8 of a tank and it could be bad fuel. I even changed the canister filter on the highway hoping that was the issue but it is not. I have been using Howe's the last 500 miles or so.
However, when I started the truck yesterday morning, (it was probably 55), there was no 'clack clack' injector/pump sound; it was very quiet but I did not have an issue with power until AFTER the fill up.
I have a Fleetguard strainer upstream from my Walbro pump and I'm going to change that today. In saying that, my fuel pressuer has not been below 16 psi this whole time.
After the inline strainer, the next step would be to drop the tank and clean the in tank strainer.

It almost seems like the inj pump is dumping fuel (although there is not any greater volume of black smoke) into the cylinders (hence the high EGTs) and i went from approximately 10mpg to about 6.
Without the 5th wheel, power seems fine but there is definitely a towing issue. I'm thinking that maybe with the truck turned off when I was unloading the 5th wheel, that whatever was on the strainer sank to the bottom of the tank? However, I have had a constant 16psi so I am not convinced it is a fuel strainer issue.

I have a Quadzilla w/Adrenaline and I checked the tune and the settings there are the same as they were before this issue started.

Could the timing on the pump be affected in some way? I do notice that the exhaust sound at idle is a much lower tone at the back (between the end of the exhaust and the muffler (straight through Magnaflow).

The turbo is spinning at idle. Could the wastegate be stuck? It is a non adjustable HTT (in sig).
Could the exhaust be plugged? smoke does not come out more pressurized than previously (tested by sight only).

I did add a neg to neg battery cable to try and eliminate the minimal surging but have not cleaned the body ground on the left side of frame, nor upgraded the neg cable.

Does this wealth of knowledge have any input on my issue? If you have any questions please let me know and I will answer them. Truck is at 341,XXX miles

Much appreciated. Thanks!

 

Since my post I did a couple things.

1. cleaned up the ground from driver side battery to frame.
2. manually manipulated the wastegate (as much as possible) so see if it was stuck
3. replaced the fuel strainer upstream from the fuel pump
4. connected my boost line splice back together with some red RTV to mitigate it blowing off

I'm going to get my 5th wheel to see if anything has changed.

57 views and no opinions; I'm kind of surprised.

Thanks,

 

So I picked up the 5th wheel last night and no difference. In fact it may be a bit worse.
With no load it runs great; with a load I can barely keep 60 mph...
I think it is the VP; I can't think of it being anything else; not even the injectors. I can't see them all going bad at once?

 

Did you check the air filter? Did it suck something in to partially plug it? That will result is loss of power, but taking a bit of a stab in the dark with this thought, because I can't see a bad air filter causing high EGT's. Bad fuel is also a possibility.
Let us know what eventually rectifies the problem.

 

Hate to think it but maybe there was gas in the diesel tank by mistake, happened to me once..

 

Turbo boots intact? My truck inner fender driver's lower sheetmetal pinch weld wore thru the boot early on and allowed intake air leak....

 

I vacuumed the airfilter with no change. Thanks!

 

I would think that with 2/3 gas it wouldn't run at all?
Filled up almost 2x with no change in towing performance; drives fine with no trailer on. Thanks!

 

I checked passenger side when I had air filter off, but did not check that one but it boosts easily to 25psi. I will check it when I get to the truck. Thanks!
I will keep the thread updated. Thanks all!

 

Have you tried the key trick to see if it is throwing any codes?

 

I see you have a 01.5. Mine has a nasty habit of the rear brakes sticking/dragging. When it does, I have all of those symptoms. High EGT, high boost, poor performance, and poor fuel mileage.

 

No codes at all.

 

I did check that as well and they are good.

I am going to clean the MAP this weekend and see what that does. Does anyone know how many ohms that should read?

Thanks!

 

I'm still thinking drivetrain drag. Differentials or transfer case. And I have to ask, is it stuck in 4WD and you don't know it?

 

When it is empty (no load like a trailer) it is fine. Front drive shaft spins freely so it is not stuck in 4WD. It also coasts freely when in neutral.
TC is good on ATF and there are no leaks on the diffs.

I might swap out the injectors with the stock ones I have, just to see if there is a difference in the way it acts. I know it won't have the get-up and go that it does with the 85hp Mach 1.6 injectors, but I should be able to determine if the same symptoms are occurring.

Thanks!