Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1990 Ford Bronco II RWD, Standard, M5OD-R1FACTORY OEM SERVICE PROCEDURE
Computed Timing
- Ensure ignition is OFF. Wait 10 seconds then activate KEY ON ENGINE RUNNING (KOER) SELF-TEST. For KOER SELF-TEST see G - TESTS W/ CODES article in this section. Start engine and check computed timing after the last service code has been displayed.
- The timing will remain fixed for 2 minutes unless SELF-TEST is deactivated. Computed timing is equal to the base timing plus 17-23 degrees BTDC. If computed timing is not within specifications, see G - TESTS W/ CODES article in this section.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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