'1990 7.3L Turbo diesel E4OD flashing OD light - 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 2 (permalink) Old 12-05-2018, 03:25 PM Thread Starter
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'1990 7.3L Turbo diesel E4OD flashing OD light

I have a 90 E350 with a 7.3 turbo diesel and an E4OD. I believe it has 167,000 miles, came from the state with records and appears to have had regular maintenance. No maintenance listed on transmission other then fluid level checks. The OD light flashes almost as soon as you start driving. The switch is mounted on the dash not on the end of the shifter. Transmission shifts smooth through all 4 gears so its NOT in limp mode. Fluid is full and not burnt. You can turn OD off and on and see the change in RPM. Having problems pulling a code, either no code or failure to read. So looking to see if anyone has ran into this issue.

Last edited by sarhuey212; 12-05-2018 at 03:32 PM.
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post #2 of 2 (permalink) Old 12-05-2018, 04:28 PM
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It never reports no code. There is ALWAYS a code, even if it is a code 11, which is no problems found. You're going to have to fix the problem that is keeping you from reading codes first, then we can find out what's wrong with the transmission.

Are you using this method? https://www.troublecodes.net/ford/

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