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 MANUALSFORD1985MUSTANG LX, 2D HATCHBACK, 5.0 FREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEM5.0L CFI TESTSTESTINGCOMPUTED IGNITION TIMING CHECK
1985 Ford Mustang LX, 2D Hatchback, 5.0 F
Computed Ignition Timing Check
1985 Ford Mustang LX, 2D Hatchback, 5.0 FSECTION Computed Ignition Timing Check
- Make sure that in-line base timing connector is reconnected if base timing has been checked. Make sure that Self-TEST is activated and start engine. Timing is locked for full Self-TEST sequence and for 2 minutes after display of last service code.
- On LTD and Marquis models, timing range should be 25-31° BTDC. On California models of Mustang and Capri, timing range should be 23-29° BTDC. On all other models, timing range should be 27-33° BTDC. If timing is correct, go to Engine Running Self-Test. If timing is not correct, go to TEST MM .
NOTE:
If engine will not start, go to TEST A
. If engine stalls while testing, go to Diagnosis By Symptom Test.
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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.