So Here's the story. I've owned this truck for several years but haven't really towed anything significant with it yet. Others have borrowed it and used it too.

It's a 1997 F250 - 4x4 with a five speed. Intake, Exhaust, chip, E-fuel.

I went yesterday about 300 miles round trip to haul a 1995 F250 ECLB - 4x4 and on the way back (setting on 40hp Tow Tune) the truck was a total turd. Struggling to keep 65, wouldn't pull on any type of grade, I was getting passed by everything in sight.

I owned a 1994.5 before this truck with a five speed and hauled pretty consistently with that thing and it hardly ever knew anything was behind it.

What should I start looking at to get this truck back to its glory days?

 

Might want to check the obvious like clogged fuel filter, in tank pick uptube clogged,and clogged air filter

What comes to mind instantly is injectors you should have them rebuilt by Rosewood next im in my phone so I cant see your profile but custom tunes do wonders. Last but not least is your engine tired?

 

All filters are okay.

I've been thinking the HPOP and/or injectors.

Unloaded, the truck runs good. It'll pull hard at about half throttle but anything more and the truck just doesn't really go anywhere.

I've got everything to do a compression test so maybe that's my next step.

 

By any chance is the ebpv not sticking?

 

No. Ebpv isn't closing.

 

New injectors and hpop if the engine checks out. Since you have supporting mods for injectors

 

Check the small things first. What's the fuel pressure with your e-fuel? Can you monitor Boost? It's not uncommon for the hose from the passenger plenum to the MAP sensor to get clogged with gunk, or even be disconnected. Do you hear the turbo spool when towing? You can disconnect the MAP sensor electrical plug and take it for a spin around the block. If it performs much better then either the hose is clogged or a bad MAP sensor (rare). How many miles on the truck?

 

What axle ratio does it have? Also another thing to check is the up pipes to the turbo. Do you have gauges or anything? Specifically boost and pyrometer?

 

70-75PSI fuel pressure. Drops to ~60psi under load.

I don't have any gauges at the moment. MAP hose was replaced several months ago. No change in performance with the sensor unplugged.

Turbo sounds good.

330K on the truck, not sure how many on the engine. PO told me it had 180k when it was installed so that would make it have around 245-250k on it now.



4.10s

No exhaust or boost leaks.





Truck now has a slight stumble in high RPMs (~2700)

 

Scan ICP Pressure & IPR DC % when the oil is warm .

 

High pressure oil pumps rarely cause this . High pressure oil leaks can . Get some data for us .Do the compression test if you want , but compression is more likely to cause a problem at lower speeds & the condition would never vary .

 

I'll use the IDS at work tomorrow and get back with y'all.

 

Alrighty.

Have a code for EBP Sensor Circuit Fault. P0470 I'll fix this first.

On Stock tuning, WOT from 60 to 90 mph
ICP maintains around 2400-2500psi.

On 60hp canned tunes the pump maintains 2800-3000psi. MAP was reading right at 30lbs. Subtract 14 for baro pressure and looks like I was making around 16-17lbs boost.

CCT came back with a Cyl. 2 & 6 balance fault codes. Idk if I should swap those injectors into different holes and see if the codes follow or do a compression check. If I go with a compression check, I guess I'll make a leak down test and do that too.

When I got this truck, it had 4 bend push rods. I've rode it pretty hard since then, and I'm hoping my CCT faults are caused by a flow problem from a bend push rod.

I'll see if I can't post some screen shots later today.

 

60HP Tune



Stock Tuning

 

Is your EBP on gauge or Absolute pressure reading. I did not see a map reading throughout your tables, or did I completely glaze over that? If that is absolute, then its pretty low IMO.

90 mph with 4.10s...eeek! I'd start with your injectors and do a compression test before you go any further, the compression test and a leak down test are the best tools to verify the motor is worth a chit before tossing a ton of money into parts that in the long run will only be minimal increases.

With 4.10s towing 8-10k bone stock is not a problem for these trucks, our logging trucks yank 10k lb chippers daily without issue. At most they have an open exhaust and 6637.

Boost check the system to a gauge read 30 psi, including the turbo with the CCV inlet plugged.