im stumped i dont know if its me or my 90 f250 with the 7.3 is just that underpowered. i have a 84 monte carlo that i race at the local dirt track, my idi huffs when i pull it then again the truck huffs without the trailer but the truck just dies when you throw a load on its back

its a 90 7.3 idi only mod is the soup bowl delete and a drop in K&N filter its got the E40D and 3.55 gears

its a open rear and wont power brake at all

now my other truck OLD BLUE is a 88 f150 with a straight six, borg warner t18 4 speed and a 3.08 rear, the other day i put a hitch under it and hooked it to the same monte carlo and it didnt hold it back not one bit, that old 4.9 laughed at that load and pulled it with no problems

does the 4.9 out work the 7.3 idi or is there something wrong with my f250

any help is much appreciated

 

300 Straight 6 makes 160HP/260ft. Torque

7.3L makes 180HP/375ft. Torque

What's the mileage on your 7.3?

Lack of Power could be tired Injectors / Injector Pump

Maybe do in for a good tune up!

 

my 7.3 has 156,000

my 4.9 has 364,000

 

I think it's time for a Inj. pump. They only last about 100k miles. Your's might be the original and be not supplying enough fuel to the engine.

My '92 7.3 with the 4.10 rear gear will pull a 6k car trailer no problem. I can't even feel it on the hwy (unless i'm on a hill lol ).

 

i think it is the original one

shouldnt this truck at least burn the right rear tire off of it?

 

Eh, it depends on tire condition, whats in the bed, how tight your rear drums are, ect.

I can drop mine into 1st and just be light on the brakes and mash the throttle and it'll flash the converter and both tires would instantly ignite.

 

the bed is empty its 8 foot, and its a open rear i could see it if i had a locker but shes a single tire fire

 

Your truck is not running properly. Prolly worn FI system. And the timing is prolly off after all of them miles.

 

thanks for the info im new to the idi but i didnt think the 4.9 had more grunt than the diesel did

 

the 300 is a good engine.the idi should out pull it with ease though.
like your 300-6.when it was low on power what was the first thing you did to it? likely a new cap,rotor,plugs,wires,air filter.aka-a tune up.
the diesel requires tune ups too.it saves $ at the pump,but come maintenance time,it costs more to tune up than a gas engine,like the 300-6.

with a lot of the idi trucks now being worn out,older,rusty etc.this means people with less $ buy them of course.
problem is,if the $ is not set aside,and the tune up planned for with the purchase of the diesel,people will find them low on power,and just barely getting decent fuel mileage.

basically,one needs to plan for a total tune up,including the timing set for a total tune up.
if the engine has higher miles,a compression test should be done to make sure its within specs.it will never have the performance otherwise(unless built that way to accept more boost,using a turbo.)

there's a few things to help the performance of the idi.but nothing compares to starting with a well tuned engine to start with.

iv had a couple 300's.my last f150 had it too.
my idi walks all over it.
if your looking for a fast tire burning truck,you made a mistake.
these are heavy duty work trucks,made to haul and pull,not be "snappy" and win races with (although i say this,my heavy idi work truck would still smoke my light f150 right off the line in a head to head foolish,pointless race lol.)
hook onto something,then you'll know for sure you have a bit more than a 300 under the hood.

 

thanks for the help everyone

 

mine smokes tires and it has a tired fuel system with air intrusion and knobbies...

e4od not locking up? I've got a t19, 6.9 with turbo though

 

3.55 gears and automatic transmission not good for burnouts.