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 MANUALSFORD1992CROWN VICTORIA TOURING, AOD-EREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - TESTS W/CODES - EEC-IVQUICK TESTCOMPUTED TIMING CHECK
1992 Ford Crown Victoria Touring, AOD-E
Computed Timing Check
1992 Ford Crown Victoria Touring, AOD-ESECTION Computed Timing Check
Turn ignition off, and wait 10 seconds. Using jumper wire or test equipment, activate KOER SELF-TEST . If engine starts and stalls (or stalls during self-test), go to Circuit Test S. Start engine, and check for following:
- If Code 98 or 998 is displayed, EEC-IV system is operating in Failure Mode Effects Management (FMEM). Vehicle cannot be diagnosed in KOER SELF-TEST; rerun KOEO SELF-TEST.
- Check computed timing after last service code has been displayed. Timing will remain fixed for 2 minutes after last code has been retrieved unless self-test is deactivated.
- Computed timing, at crankshaft, should equal base timing (see vehicle emission decal) plus 20 degrees BTDC. This timing may vary 3 degrees (+/-). If computed timing is within specification, perform KOER SELF-TEST . If timing is not within specification, go to step 2) of CIRCUIT TEST PA (TFI), of CIRCUIT TEST PB (DIS) or of CIRCUIT TEST PC (EDIS).
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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.