'1991 7.3L IDI Diesel reliabilty - Diesel Forum - TheDieselStop.com
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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post #1 of 10 (permalink) Old 09-23-2011, 04:06 PM Thread Starter
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'1991 7.3L IDI Diesel reliabilty

Hello, I am very new to the Diesel engines. I have the opportunity to buy a 1991 F Superduty DRW with the 7.3 Diesel in it. It has 142000 miles on it. It has a 12 ft flatbed on it. I am wanting a Truck to haul my 8900 lb 5th wheel trailer so I will want to change the bed. I can get it for a low price but is the 1991 7.3 a reliable engine? I have heard nothing but good about the 7.3's but not sure if there were good years and bad years. It says it has 180 hp and 345 ft lbs of torque which I believe would not have a problem pulling the 5th wheel. Anyone have knowledge about this year of engines? I heard Diesels can go 300000 miles. Is this true?
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post #2 of 10 (permalink) Old 09-23-2011, 05:09 PM
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Hello, I am very new to the Diesel engines. I have the opportunity to buy a 1991 F Superduty DRW with the 7.3 Diesel in it. It has 142000 miles on it. It has a 12 ft flatbed on it. I am wanting a Truck to haul my 8900 lb 5th wheel trailer so I will want to change the bed.
Sounds like it's broke in good. Don't they have fifth wheels for flatbeds?

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I can get it for a low price but is the 1991 7.3 a reliable engine? I have heard nothing but good about the 7.3's but not sure if there were good years and bad years. It says it has 180 hp and 345 ft lbs of torque which I believe would not have a problem pulling the 5th wheel. Anyone have knowledge about this year of engines?
Reliability is very good if maintenance is kept up. You will want to get some fleetguard test strips from any heavy truck dealer or most tractor dealers and check the coolant for SCA levels. These engines have a weak point which will cause pinholing of the cylinder wall if the proper coolant is not used.

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I heard Diesels can go 300000 miles. Is this true?
And then some

1992 F250 XLT 4x4 Super Cab 7.3 IDI E40D 3.55 ATS 088 4"R.C 360k
1982 MBZ 300SD W126 California model w/Sunroof, no EGR
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post #3 of 10 (permalink) Old 09-23-2011, 10:35 PM
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I have 275,000 on mine. I fully expect to get to 500,000

1990 F250 Extended Cab 7.3 Non Turbo 280,000
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post #4 of 10 (permalink) Old 09-26-2011, 04:38 AM
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You do not mention what axle ratio or transmission you have..... they will be the deciding factor as to what you can tow......

The info for the above can be found on the data plate on the drivers door post...... get the info and post it here.

If for instance the trans is a C6 with 410 axle that would be a fuel guzzler ...BUT you can improve fuel mileage with a Gear Vendors or axle gear change.




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post #5 of 10 (permalink) Old 09-26-2011, 09:17 AM
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You didn't state if it has the automatic or 5 speed. If it's the 5 speed, with its ratios it actually makes a better tow vehicle with the higher 3:55 rear end than the 4:10's.
The engine/truck is as reliable as the preventative maintanance/care it gets. My '91 has 243,000 miles on it with a LOT of towing and has needed no internal work so far. I only had the valve covers off once and that was to retorque the heads when I installed a turbo system in '93. Of course there's normal maintanance stuff like water pumps, injectors, drainback lines, etc.

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'91 F-250 SC 4X4, 5spd. ATS Turbo, 3:55 diff.
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post #6 of 10 (permalink) Old 05-14-2015, 12:58 PM
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91 ford 7.3, suddenly lost power nd quit. No running since. Seems to have lost compression. Could it be timing chain? Any videos on how to change?

Bill in Oregon
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post #7 of 10 (permalink) Old 05-14-2015, 02:01 PM
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Could it be timing chain?
They don't have a chain.

Heavy truck and diesel mechanic (thankfully retired after 30+ yrs)
'91 F-250 SC 4X4, 5spd. ATS Turbo, 3:55 diff.
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post #8 of 10 (permalink) Old 05-14-2015, 02:31 PM
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1991 7.3L IDI Diesel reliabilty

Seems to have lost compression? Without a compression test your just spittin into the wind.

It may have lost power to the fuel shut off solenoid if it just suddenly died, or the lift pump may have split the internal diaphragm.

It sounds like you need to do some basic tests to determine the issue(s).

1994 F-350 7.3 IDI Turbo, crew cab, E4OD,4:10 L/S, LB, Dually
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post #9 of 10 (permalink) Old 05-13-2018, 06:25 PM
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Replaced glow plugs, relay and controller, fuel return lines on my 1991 Ford F250 diesel. Bled the lines and pump works. "Wait to Start" light won't light up and truck won't start. What am I missing? Many thanks.
Egghead
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post #10 of 10 (permalink) Old 05-13-2018, 07:13 PM
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Replaced glow plugs, relay and controller, fuel return lines on my 1991 Ford F250 diesel. Bled the lines and pump works. "Wait to Start" light won't light up and truck won't start. What am I missing? Many thanks.
Egghead
Have you checked to see if you have power at the glow plug solenoid and if getting power through it with key on? could be a bad solenoid or even controller.
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