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.
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HOMESERVICE MANUALSFORD1991THUNDERBIRD V8-302 5.0L HOREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTECHNICAL SERVICE BULLETINS
1991 Ford Thunderbird V8-302 5.0L HO
Computers and Control Systems: Technical Service Bulletins
1991 Ford Thunderbird V8-302 5.0L HOSECTION Technical Service Bulletins
- Customer Interest
- By Symptom
- Customer Interest
- Driveability
- False instrument warning light/gauges
- Engine - Miss/Hesitation/Stalls/MIL ON
- PCM - MIL ON/Codes 173 And/Or 177 Set
- EEC IV - Self Test Codes and MIL Service Tips
- Overview
- Overview of Three Digit EEC-IV Self-Test Codes
- 1) Technician Not Familiar With Self-Test Code Output
- 2) Inadvertent Erasure of Continuous Memory Self-Test Codes
- 3) Concern Setting Continious Memory Code Isn't Present
- 4) Grounded STO/MIL Circuit
- 5) Engine Running In Hlos
- 6) Misinterpretation of MIL Bulb Check
- 7) MIL Flashes During Self-Test
- 8) Processor KAM Is Erased or Fails
- 9) Damaged Star Tester
- 10) KOEO Processor Ram Test Failed
- 11) Intermittent VSS Fault Detected In Wiggle Mode
- 12) IDM Pulswidth Not Recognized By Processor (EDIS Vehicles)
- 13) Intermittent Ignition System Fault
- 14) Intermittent Open STI Circuit
- 15) Power Lost to EEC Processor
- 16) Other Warning Lamps Mistaken For MIL
- 17) Development Testing /Wrong Processor Released to Production
- All Technical Service Bulletins
- Vehicle - Welding Precautions
- Engine - Miss/Hesitation/Stalls/MIL ON
- PCM - MIL ON/Codes 173 And/Or 177 Set
- IDM and Spark Timing Diagnosis - Manual Revision
- EEC IV Pinpoint Test H - Manual Correction
- EEC IV - Self Test Codes and MIL Service Tips
- Overview
- Overview of Three Digit EEC-IV Self-Test Codes
- 1) Technician Not Familiar With Self-Test Code Output
- 2) Inadvertent Erasure of Continuous Memory Self-Test Codes
- 3) Concern Setting Continious Memory Code Isn't Present
- 4) Grounded STO/MIL Circuit
- 5) Engine Running In Hlos
- 6) Misinterpretation of MIL Bulb Check
- 7) MIL Flashes During Self-Test
- 8) Processor KAM Is Erased or Fails
- 9) Damaged Star Tester
- 10) KOEO Processor Ram Test Failed
- 11) Intermittent VSS Fault Detected In Wiggle Mode
- 12) IDM Pulswidth Not Recognized By Processor (EDIS Vehicles)
- 13) Intermittent Ignition System Fault
- 14) Intermittent Open STI Circuit
- 15) Power Lost to EEC Processor
- 16) Other Warning Lamps Mistaken For MIL
- 17) Development Testing /Wrong Processor Released to Production
- MIL ON/No Codes Set Explanation
- Heated Exhaust Gas Oxygen Sensor - Application Chart
- EGO Sensors - Silicone Contamination
- Engine - Lean Driveability Symptoms
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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.