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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 05-29-2006, 12:18 AM   #1 (permalink)
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94 IDI Losing Power

I was wondering what would cause my 94 to be losing power. Two months ago i was getting 20 mpg now it is around 10. what would cause the milage to go down like that. Also when pulling it doesn't have near the power it should/used to have. ??
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Old 05-29-2006, 01:23 AM   #2 (permalink)
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Re: 94 IDI Losing Power

If you have over 125k miles on the current injection pump, it is highly likely it needs to be rebuilt. About a $300.00 - $450.00 bill if you remove it and reinstall it yorself. Ask for instructions BEFORE you pull it out if that is the way you go. New or rebuilt injectors are recommended also when you rebuild the IP. About $25 - $35 each. OkieG
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Old 05-29-2006, 08:27 AM   #3 (permalink)
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Re: 94 IDI Losing Power

First I would be change the fuel filter and add some additives to the tank. Fill the new filter with the additive and install it.

Do a pressure and flow test on the lift pump too.....
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Old 05-29-2006, 10:26 AM   #4 (permalink)
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Re: 94 IDI Losing Power

I'm going to second the fuel filter. Do the simple PM stuff first. Check your air filter too, maybe somethign built a nest in there and clogged it up.
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