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
TFI-IV Stator Check (Except Closed Bowl)
- Attach spark tester between secondary ignition coil wire and ground. Crank engine and check for spark. If spark is present, stator is okay. If spark is not present, disconnect TFI-IV stator harness connector.
- Install TFI Ignition Tester (105-00002) Red lead to battery positive post. Disconnect "S" terminal wire from starter relay. Attach remote starter and crank engine. LED lights should blink while engine is cranking. If lights do not blink, remove distributor. Remove TFI-IV module from distributor. Measure resistance between TFI-IV module terminals. Perform TFI-IV MODULE test and See Figure . If resistance is NOT as specified, replace stator.
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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