A friend of mine has an 01ish 7.3 one ton dually. It has been lacking power dramatically from what it used to have. He had all new injectors put in and still has the same issue. He asked me if I could look at it for him, and I said I would. Not sure when, but looking for any ideas where to look. I've got some thoughts, but would like to hear from you guys. Is there a place to check fuel pressure on these? I've really not been around the newer 7.3 much at all..

 

Id lean toward low fuel psi or weak Hpop. How many miles does he have on it. Any smoke or anything. I know when that 17 * was weak with the superduty AD's it was a Smokey gutless pig. I swear I could walked rings around it with the old AA's it ran that bad. New Hpop was night and day.

 

I'm not sure on the miles, but he works it hard for sure. I really have no details as of yet, but I'll check things out.

 

Hit up the 99-03 section!

 

I will when the time comes if I need to. I need to get it in my possesion and hook my scan gauge up to it and check some things out so I know a little more on what is going on.

 

No, they're a bunch of jerks.

Oh, wait, nevermind.

Actually, I'd agree on checking fuel pressure. No schraeder valve on the newer bowls. You have to use an allen wrench and cuss at it to remove a plug so you can temporarily plumb in a gauge. Top left hole is pre-filter and bottom right is post filter (this side of the bowl faces the cab)



The big problem on the soooperduties is the screens in the mixing chamber inside the fuel tank getting clogged up. The mixing chamber is the white plastic thing on the fuel pick up.

Clean screens look like this


Dirty screens



The fix is the hutch & harpoon mods (in tank mods) to get rid of this junk and just put an inline filter outside the tank.

Instructions : Welcome to guzzle's In-tank Hutch Mod Web Page

 

Thanks for the pics and ideas Chris. At least I know how to check the fuel pressure now. Reps sent.

 

Be sure and check it for boost leaks too. All those extra lines and boots for the IC make a lot of extra places for you to lose boost pressure.

 

Will do Nate.

 

Couple questions Chris, if I need to do the fuel tank mod, can you get at the tanks with the bed removed and would that be easier? Also, how can I tell if I need to be looking at this as the problem? I suppose if my fuel pressure is low I should use a jug and put the feed line in there and recheck? Then if its up the tank mod needs to be done as there is restriction? Just wondering and wanting to clarify. Thanks.

 

You can do it with the bed off. Theres a good write up on doing that way around here somewhere.

 

Only one tank on the 01. You can either drop the tank or pull the bed. If you've got the set up to make pulling the bed easy, then it's probably easier to do it that way than to drop the tank. But beds can get hard to move around, bed bolts sometimes don't want to come out, etc., so most drop the tank to do the mod.

Remember since it's electric fuel, you need to check the pressure under load. Duct tape the gauge to the windshield and go for some WOT runs to see what the pressure drops to. You could check again out of a jug of fuel, but if pressure falls on it's face, then odds are it's the clogged screens.

I like the idea of checking for boost leaks too. Check the CAC tubes and see if they are aluminum or steel. If they're aluminum, pull the driver side tube and remove the foil down at the bend that goes around the power steering pump. The line would rub a hole in the aluminum tubes so Ford switched to steel tubes at some point.

 

I'm just bumping this up to the top so its easier for me to look at. I've finally got the truck in my shop now, gonna mess with it this weekend and see what I can come up with. It's a 2000, and its got 205k on it. Definitely been worked hard...

 

Took it for a test drive. The fuel pressure is hanging right at 60 or so on a wot run, so that seems ok. 44%dc at 3000+ psi on a wot run, thinking the hpop is ok. Max of 8 psi of boost, gotta start looking here. What should a stock SD have for boost? I was guessing 22ish?

I got 3 codes, 1209, 1282, 1670. Two are icp codes, and it is soaked in oil. It has an occasional skip in the motor too, I'm gonna guess that the icp is doing that too. I'm gonna try my spare after I can find for boost leaks.

1670 I need a little advice on. P1670 EF Feedback Signal Not Detected That's what it is, but I'm unsure what that means.

Thanks guys.

 

Wow, what neglect. This guy is hard on vehicles, and this is no exception. The oil looks as old as I am, the air filter is so full of crap it can't even breathe. Had one of the ypipe clamps down below the ypipe flange, so had a massive boost leak there. Oil everywhere on the turbo, sypder, etc. No big leaks though, just a couple drops on my floor. Inside of the boots and pipes are a mess, gonna do a ccv mod on this thing. Turbo wheel is chipped a little, but has no excessive play so I'm gonna leave that for now. Had the wrong oring between the turbo and ypipe too.

Gonna order a new icp, 6637, some orings and a few other things. I didn't even look at the fuel filter, I'll just get a new one. I imagine its not very good either. I think with some fresh oil, boost leaks fixed, and new icp it will be back in action.


The so called mechanic I know that put new injectors in was definitely just throwing parts at it hoping for the best. It hasn't been driven much since he did the injectors, he must not have even changed the oil or put an air filter on. He charges an arm and a leg too, one of only a couple "mechanics" in town. Thinking I need to get into more mechanic work. I just can't stand working on some of this newer crap..

I did a little reading on the 1670 code, seems its possible its related to the icp too. Any other ideas are appreciated, but I'm starting with that means I know its bad.

It's gonna need a clutch soon too, man what a pain. About 2 inches off of the floor, if that, its released. Maybe there is an adjustment for that? Anyone?