1hd-ft - What’s your boost without load?

[96TrailSurfer]

Folks with 1hd-ft with stock turbos, what boost do you get as your rev the engine without load (Park or Neutral), at what rpm, and how fast do you get there?

I am trying to figure out if my turbo is having issues spinning up.

 

[Dusten]

Without load you should see almost no boost

 

[96TrailSurfer]

Without load you should see almost no boost

Without load I get to about 5 psi at 4000 rpm

 

[Dusten]

Without load I get to about 5 psi at 4000 rpm

Hence you should see almost no boost.
I can't believe you're free revving that thing to 4k

 

[96TrailSurfer]

Hence you should see almost no boost.
I can't believe you're free revving that thing to 4k

I am having major power loss issues when it’s in gear (forward or reverse), thus trying to diagnose if it’s fuel or turbo

Also it’s 1hd-ft, not 1hd-t, so it’s a lot more revvy. It’s irks torque is at 2500 rpm (or 2800, forget now)

 

[Dusten]

I am having major power loss issues when it’s in gear (forward or reverse), thus trying to diagnose if it’s fuel or turbo

Also it’s 1hd-ft, not 1hd-t, so it’s a lot more revvy. It’s irks torque is at 2500 rpm (or 2800, forget now)

Rev is a relative term. Still a slow rolling diesel

If you're working in turbo issues you need to attempt to monitor boost under load.

If it's moving fuel and not air you'll see heavy black smoke.

If you're not smoking I'd bet you're not moving fuel

 

[96TrailSurfer]

Rev is a relative term. Still a slow rolling diesel

If you're working in turbo issues you need to attempt to monitor boost under load.

If it's moving fuel and not air you'll see heavy black smoke.

If you're not smoking I'd bet you're not moving fuel

Indeed, fuel seems to be the main or at least the most logical culprit. Going forward or backwards, I floor the gas and get no virtually response, it sloooooooooowly revs up until the turbo finally kicks in and I get a bit of power. No smoke, except a bit of blue smoke while the engine is still cold.

I've been troubleshooting for a week:
- checked the gas tank screen (clean)
- isolated the pump by running from a bottle
- checked the glow screen relay (my glow screen light is on)
- checked vacuum
- checked the boost tap going from the cross-over pipe to the pump and even ran a brand new line bypassing the Turbo Pressure Sensor and the VSV entirely
- checked SICS and BACS,
- adjusted the boost compensator pin, and
- deleted the ACSD

Boost compensator adjustment gave me slightly more power, but fundamentally it's still DOA.

Neither the engine, nor the turbo sound any different.

At this point, all I have left for suspects are
- timing belt or bearing on the pump - maybe it's slipping under load?
- waste gate issue on the turbo delays it kicking in (but I should still have more power even without the turbo)
- last and worst - the pump has somehow s*** the bed and needs to be rebuilt

Any ideas welcome.

 

[KiwiDingo]

I can't believe you're free revving that thing to 4k

My FT revved out to nearly 6k after pump mods with zero concerns. If you actually read the FSM there's a procedure there for testing the turbo boost while free revving the engine. It's completely safe and normal procedure.

 

[96TrailSurfer]

My FT revved out to nearly 6k after pump mods with zero concerns. If you actually read the FSM there's a procedure there for testing the turbo boost while free revving the engine. It's completely safe and normal procedure.

Can you point me to a page pls? I need to do that test

 

[KiwiDingo]

Can you point me to a page pls? I need to do that test

I'll ask the mate I gave my FSM to if he can send me a pic of that page.

 

[Dusten]

My FT revved out to nearly 6k after pump mods with zero concerns. If you actually read the FSM there's a procedure there for testing the turbo boost while free revving the engine. It's completely safe and normal procedure.

If I actually... Gee so condescending. As I don't have an ft, I'm not going to read it

Op have you verified you're not getting air in the fuel system?

 

[KiwiDingo]

If I actually... Gee so condescending. As I don't have an ft, I'm not going to read it

It's Actually the same procedure for the others too, not just the FT

 

[Dusten]

It's Actually the same procedure for the others too, not just the FT

As I've not had boost issues I've had no reason to read the fsm.

I've had a pre heater leak. I've done a timing belt. I'm doing valve adjustment.

Other than needing specs for shims none of these really prompt a need to open the fsm. They're basic mechanical procedures.

 

[96TrailSurfer]

Op have you verified you're not getting air in the fuel system?

Nothing obvious that I could see - what’s a good way to test that?

 

[Dusten]

Nothing obvious that I could see - what’s a good way to test that?

It doesn't need to be obvious

I had a leak this small

And it ran like this







You can replace underhood sections of hose with clear line to look for bubbles.

 

[96TrailSurfer]

It doesn't need to be obvious

I had a leak this small
View attachment 3005848



And it ran like this







You can replace underhood sections of hose with clear line to look for bubbles.

Are you talking about the line to the pump, in which case it shouldn’t be an issue as I ran the pump from a bottle with Sam’s results, or the high pressure line to the injectors?

 

[Dusten]

Are you talking about the line to the pump, in which case it shouldn’t be an issue as I ran the pump from a bottle with Sam’s results, or the high pressure line to the injectors?

I guess I missed that. Generally the leak is in the primer or a line leading to or from it. If you bypassed the entire assembly I'd have to suspect the pump. Have you verified the pumps output?

 

[96TrailSurfer]

I guess I missed that. Generally the leak is in the primer or a line leading to or from it. If you bypassed the entire assembly I'd have to suspect the pump. Have you verified the pumps output?

I haven't done a pressure test on the output, but i've fiddled with it rather a lot otherwise

The problem appears to have fixed itself yesterday, as the truck was warming up, the problem got less and less until the truck started performing better than ever before, really taking advantage of the new fuel setting.

We'll see if this persists today.

I don't know what exactly I did to fix it, but possibly it's the ACSD delete, and it just took a bit of time for something that was caused by the ACSD to work itself out.

 

[Dusten]

I haven't done a pressure test on the output, but i've fiddled with it rather a lot otherwise

The problem appears to have fixed itself yesterday, as the truck was warming up, the problem got less and less until the truck started performing better than ever before, really taking advantage of the new fuel setting.

We'll see if this persists today.

I don't know what exactly I did to fix it, but possibly it's the ACSD delete, and it just took a bit of time for something that was caused by the ACSD to work itself out.

That's unsettling that it just stopped.

 

[96TrailSurfer]

That's unsettling that it just stopped.

Indeed - I really thinks it was either ACSD delete - if it was stuck, may have been limiting throttle plate movement, or the waste gate actuator became sticky, although it seems unlikely based on the symptoms.