88 7.3 diesel info - 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 02-04-2009, 06:54 PM
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Thumbs up 88 7.3 diesel info

hello my name is mike im thinking of buying a 88 nonturbo diesel truck and was wondering if you guys would help me with some good and bad info about the truck thanks mike
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Old 02-04-2009, 06:56 PM
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hey man my dad used to have an idi and that thing was a beast! and parts were way cheap!
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Old 02-05-2009, 01:10 PM
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bump bump bump
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Old 02-05-2009, 07:29 PM
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anymore info come on guys
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Old 02-05-2009, 07:41 PM
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the good : reliable, relativly cheap
the bad: they are slow lol but that can be fixxed with a little work just turn up the pump and adjust the timing
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Old 02-05-2009, 08:07 PM
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An 88 will have a 7.3 IDI, so I will lists its faults

They took the 6.9 IDI (circa 1983-1986) and bored it out to 7.3 liters. This made the cylinder walls thin. Without a special coolant additive (SCA), they can cavitate over time (small holes in the cylinder walls). Coolant in oil, oil in coolant, that type of thing. You can buy a SCA test strip kit from your local store, test the coolant. If its up to spec, then good, if not, I would walk away.

They changed the valve guide design from the 6.9 IDI (the 6.9 design caused them to burn oil). But in doing so, it sometimes causes valve failure, which results in a F'ed up engine.

Those are the two major things wrong with them. You can go more into depth, little things like the glow plug controller stops working if 1 glow plug goes bad, but all in all they are good engines. Parts are easy to get, and cheap. They really truly only need a couple wires to make them run, and are way easy to diagnose and fix. A true, mechanical engine, easy for the average backyard mechanic to fix.
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Old 02-06-2009, 06:20 AM
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hey thanks guys
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Old 02-18-2009, 03:44 PM
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transmission?

[QUOTE=FordGuy100;1008203]An 88 will have a 7.3 IDI, so I will lists its faults

Im looking at an 1986 7.3L IDI 4x4 and am wondering about the manual transmission. Is it a 4 or a 5 speed ? I just want to know.
Any information would be helpful. Thanks.
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Old 02-18-2009, 03:47 PM
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If its factory, then it should have a T-19 4 speed tranny. They are strong, but no overdrive. It could have a ZF-5 speed swapped in though, not as good of a tranny, but it has overdrive.
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Old 02-18-2009, 03:52 PM
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which is better for offroading? If I get it, it will spend most of the time offroad. Thats why I ask. Thanks
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