1990 Ford Bronco II RWD, Standard, M5OD-R1FACTORY OEM SERVICE PROCEDURE

Ignition Timing Specifications

IGNITION TIMING

Calibration Code (1) Degrees BTDC RPM
0-49S-R00 10 645-795
0-49T-R10 10 645-795
0-50S-R00 10 (2) 575-725
0-50T-R10 10 (2) 575-725
9-49F-R00 10 645-795
9-50K-R00 10 (2) 575-725
(1) Located on underhood emission decal.
(2) Automatic transmission in Drive.
IGNITION TIMING

Calibration Code (1) Degrees BTDC RPM
0-65T-R00 10 850
0-65T-R00 10 800
0-66F-R10 10 850
0-66F-R10 10 800
0-66H-R10 10 850
0-66H-R10 10 800
0-66T-R00 10 850
0-66T-R00 10 800
9-65F-R00 10 850
9-65F-R00 10 800
9-65H-R00 10 850
9-65H-R00 10 800
(1) Located on underhood emission decal.
IGNITION TIMING

Calibration Code (1) Degrees BTDC RPM
0-58F-R00 10 Idle
0-58H-R00 10 Idle
0-58K-R00 10 Idle
0-58J-R00 10 Idle
0-58L-R00 10 Idle
0-58Q-R00 10 Idle
0-58S-R00 10 Idle
0-58T-R00 10 Idle
(1) Located on underhood emission decal.
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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