7.3 IDI Bad Injector? How do I check it? - Diesel Forum - TheDieselStop.com
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7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

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Old 05-10-2005, 10:00 AM   #1 (permalink)
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7.3 IDI Bad Injector? How do I check it?

I have a 7.3 Diesel in my 1986 IH Dump Truck, you guys have helped me out a lot on both of my powerstroke engines, so I thought I'd throw this out there. I just bought this truck, it has 94K on it, just had new head gaskets done, but it smokes a lot at start up until warm, and when warm, it has a miss at higher RPM's. I was told it's probably a bad injector, but how can I tell if it is and if so, which one? It also is governed to 55mph, how can I turn that up? I do have a good fuel system from a 1984 6.9 out of a F-350 if the injectors are the same I could swap them out. Any help would be greatly appreciated.

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Dan
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Old 05-10-2005, 02:30 PM   #2 (permalink)
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Re: 7.3 IDI Bad Injector? How do I check it?

About the easiest way to check a bad injector is to have them pop tested. Remove them and take them to a injector and injection pump repair shop and ask. Most will do it for free or if they are ok the charge is very small. A complete new set is about $175.00 to $240.00 so if someone wants $50.00 to test them just buy a new not rebuilt set or find another shop. Out where you can't find a shop just remove the suspect injector and swap it with another one that you know is good and see if the miss follows and now is in another cylinder. The copper gaskets will need to be replaced because once you torque them down to 35 lbs and they heat up they will work harden. Some have tried to reuse them with many-o-problems like lots of carbon leaking past the gasket and freezing the injector in the head. This wont happen in a few hundred miles but why take that chance.
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Old 05-11-2005, 08:41 AM   #3 (permalink)
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Re: 7.3 IDI Bad Injector? How do I check it?

Do you think the injectors from my 6.9 are the same? I know they are all good, that engine had a bent rod from some idiot flooding it with starting fluid. Thanks for the help.
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Old 05-11-2005, 09:03 AM   #4 (permalink)
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Re: 7.3 IDI Bad Injector? How do I check it?

They should be the same. You can look at the letter stamped on the body of the injector.
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1997 F350 4x4 Crew Cab, long bed, BTS trans, BTS chip, AeroForce single guage, MBRP 4" exhaust, DIY air filter, SD intercooler awaiting time to install!

1980 Mercedes 300D
Sold - 1990 F350 4x4 crew cab ATS turbo IDI
Sold - 1990 F250 4x4 extra cab NA IDI
Sold - 2005 F350 4x4 crew cab totally stock
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Old 05-11-2005, 12:27 PM   #5 (permalink)
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Re: 7.3 IDI Bad Injector? How do I check it?

Where is the best place to buy new seals for the injectors?
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Old 05-11-2005, 01:30 PM   #6 (permalink)
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Re: 7.3 IDI Bad Injector? How do I check it?

Where are you at? Any local diesel shop should have the Dipco kit. $27-$35 for me locally.
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Neal in MN
1997 F350 4x4 Crew Cab, long bed, BTS trans, BTS chip, AeroForce single guage, MBRP 4" exhaust, DIY air filter, SD intercooler awaiting time to install!

1980 Mercedes 300D
Sold - 1990 F350 4x4 crew cab ATS turbo IDI
Sold - 1990 F250 4x4 extra cab NA IDI
Sold - 2005 F350 4x4 crew cab totally stock
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