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 MANUALSFORD1991CAB & CHASSIS 5.8 H, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODES - 5.8LTEST DP5.8L PFI PIN I.D. (F-SERIES PICKUP & BRONCO)PRELIMINARY INSTRUCTIONS (A/T VEHICLES)
1991 Ford Cab & Chassis 5.8 H, Automatic
Preliminary Instructions (A/T Vehicles)
1991 Ford Cab & Chassis 5.8 H, AutomaticSECTION Preliminary Instructions (A/T Vehicles)
Record and clear Continuous Memory Codes. Warm engine to normal operating temperature. In Low gear, accelerate hard to 25 MPH and coast down to a stop. Shut off engine. Perform KOEO SELF-TEST. Go to step 1).
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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.