Just bought a 94 turbo idi, couple questions - Ford Powerstroke Diesel Forum
7.3L IDI (Non-Powerstroke) Diesels Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

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Old 03-08-2011, 01:44 PM
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Just bought a 94 turbo idi, couple questions

Is that white canister on the upper left side of the engine the fuel filter?
How many quarts of oil does this 7.3 take?
Does the turbo have a wastegate and how is it controlled?
What is the peak stock boost level?
Do I need a scanner to pull codes?
Can i do a buzz test to see if injectors are good?
Where is the full pump on this engine?
Does this engine have a hpop like the powerstroke, where is it located ?
How does the injection pump work on these engines and does idi mean that the fuel is injected into a manifold instead of the cylinder?


Sorry so many questions but im used to powerstrokes. Its my first idi and im baffled for now. the truck has 180,000 and runs strong, has some small oil leaks tho and i think i see some oil around the turbo housing any advice would be appreciated. Thanks
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Old 03-08-2011, 06:19 PM
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new problems

ok i got this thing home today and i have a oil in the rad, not alot just a little bit resting on the top of the antifreeze.
the truck blows gray smoke constantly even at idle.
the injector in the rear on the left side of the truck has a hose comming off of it and has a bolt in the end of it but at the injector it leaks diesel a bit. would that cause problems with fuel?

is the oil pan hard to change, do i have to pull or lift the engine a bit?

what are the metal lines on top of the injectors? are they for oil? are these injectors drivin by high pressure oil? and are the rubber hoses for the fuel?

please help me im goin nuts, i need to get this thing running good to protect my 3 grand investment

my tranny is shot to tranny code E is that E4OD?

180,000 miles , should i replace the injectors?
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Old 03-08-2011, 11:07 PM
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one your trucks an idi so you dont have high pressure oil, two if you have oil in your coolant, you have a big problem, three yeah the E40D is the auto trans code.

Hope someone else will chime in.
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Old 03-08-2011, 11:13 PM
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yes thats the fuel filter
roughly 15 quarts for a powerstroke, id imagine these are the same
the turbo is not wastegated that I know of. Its just driven off of the exhaust not really controlled by anything
You dont have electronic injectors so no buzz test
the fuel pump is down on the drivers side of the motor by the PS pump if i remember correctly
Oil in the coolant means look into your oil cooler O rings.
the oil pan means pulling the motor
those metal lines are fuel from the injection pump, yes they inject into the manifold side not the cylinder
gray smoke is low fuel pressure i believe.

Ok for the disclaimer. I am a Powerstroke guy so these are all "shot from the hip" answers and I could be wrong
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Old 03-09-2011, 03:12 AM
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10 qts. with the idi oil filter, 11 qts. with powerstroke oil filter fl-1995 which offers better filtration. The canister is the fuel filter, the metal lines are fuel lines, no hpop, idi means indirect injection, E4OD-computer controlled, IDI-mechanical = no computer.

Last edited by Texas6.0; 03-09-2011 at 03:20 AM.
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Old 03-09-2011, 04:07 AM
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Looks like most of your questions have been answered but one correction, the fuel pump (low pressure) is on the passenger side down low. It looks just like the old gasser fuel pump. This low pressure pump just feeds the injector pump on the top front of the motor which in turn feeds the injectors. The IDI injectors work strickly from pressure. Once the pressure from the injector pump exceeds a certain point, they fire.
Do some more searching on the turbo though, I have not messed with mine yet but I thought I read in another thread that there was a waste gate because someone else was adjusting it to increase the boost.
I have the same tranny and it had fried as well but I was able to get it rebuilt for around a grand.
Good luck.
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Old 03-09-2011, 06:40 PM
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more questions

thanx for all the help, i do have a couple more questions tho.

if it is the oil cooler that is putting the oil in the coolant, will the rebuild kit fix that problem?

one of the injector return lines is leaking, would that cause constant smoke at the exhaust.

should i replace the injectors? they have 180,000 miles on them
do the injectors on these trucks go bad like the powerstrokes?

what does the torque screw do and what does the hex bolt do in the diamond n the injections pump do?

where is the torque screw located? and what is its normal setting?

would messing with the timing or those fuel and torque screws have any thing to do with why this trucks smokes at idle?

im thinking maybe someone tried to mess with it and failed?
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