How do you adjust ignition timing on 1994 Ford F-250 5.8?

You cannot adjust the ignition timing of the Ford 5.8L with electronic fuel injection.. Instead, the computer controls timing adjustments using sensors on the crankshaft and camshaft to monitor engine speed and position. If your engine is running smoothly and there's no check engine light or codes stored within the computers data logging capabilities, chances are there are no issues with igniton timing.