Possible purchase - 1991 IDI with engine knock - 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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post #1 of 2 Old 12-07-2009, 11:21 AM Thread Starter
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Possible purchase - 1991 IDI with engine knock


I've read a fair amount on the forum here, but I would still like to get your thoughts on a potential purchase of this truck:

1991 xlt pick-up no rust very straight, 8 foot bed captain chairs,a/c,cd player,elect windows and locks 5 speed ATS turbo charger with dash gauges ,canopy alarm system,new battery,fuel pump, new hd clutch,new radiator,new injectors, new glow plugs ,new belts and hoses, front brakes,new rear tires,new window motors . this truck is worth $5,000 but just developed a bad engine knock. i am not a diesel mechanic and don't have the money to repair this truck so i will sell as is for $2,000. for more info email me

I've emailed the guy and he said that the noise just came on all of a sudden at 40 mph accelerating in 4th gear and it makes the truck shake like it's coming apart. From reading the forum, it looks like it could be as simple as a bad injector or as bad as a rod or bearing issue. I'm thinking unlikely that it's an injector since he just replaced them all, but maybe he got a bad one?

The question is, worst case scenario, what does a good used IDI engine go for, and is $2k + used engine a good deal on this truck?

Other thoughts?

I also have a line on a 1999 F350 w/6 spd. 200k mi for $6k. It's an estate sale and they're taking forever to get the DMV paperwork sorted out. I don't need a truck right now but will come spring. Should I just hold out for the PSD? I'm just looking for a work and off road rig, wood hauler etc.


Late '99 F350 4x4 XLT Reg Cab with ZF6S & Factory LSD rear, nearly bone stock, 200k+ mi
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post #2 of 2 Old 12-14-2009, 08:26 PM
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if im reading that right...your looking into buying the '91? If thats the case the best way to check the injectors (unless they dramatically changed from my 89) is to manually crack the fuel lines one by one while its running until you get the cylinder to cut out. If you get one that does not cut out then thats the problem cylinder. Either that cylinder has a bad injector (which will be appearant from more fuel coming back up out of the fuel line) or the piston has a whole in it. I had an 88 that decided to blow a hole in the piston one time and it took me forever to find it. Just an idea, have to see if the guy will let you check it and if you find it not raise the price on ya. Thats my two cents anyway...see if anyone else has another idea.
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