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 LX, 5.0 TREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - TESTS W/O CODES - GASOLINEROUTINE 219 - EXHAUST SMOKE
1991 Ford Thunderbird LX, 5.0 T
Routine 219 - Exhaust Smoke
1991 Ford Thunderbird LX, 5.0 TSECTION Routine 219 - Exhaust Smoke
NOTE:
White smoke is normal during warm-up.
ROUTINE 219 - EXHAUST SMOKE
| SYSTEM & Component(s) | GO TO: |
|---|---|
| BLACK SMOKE (RICH MIXTURE): Air Cleaner Element (Restricted), Fuel Pressure Regulator Injectors, EEC Components | Perform a visual inspection, See SYSTEM/COMP TESTS , see TESTS W/CODES |
| BLUE SMOKE (BURNING OIL): PCV Valve, Valve Guides/Stems/Seals, Oil Drain Passages in Head Rings (not seated, seized, gummed up, worn), Cylinder Bores (scuffed) | See BASIC TESTING , see engine mechanical condition |
| WHITE SMOKE (COOLANT IN COMBUSTION): Thermactor Vacuum Delay Valve (restricted), EGR Cooler, Intake Manifold (cracked/porous), Cylinder Head/Gasket (Leaks), Block (cracked/porous) | See I - SYSTEM/COMP TEST |
RENDER: 1.0x
NO RELATED
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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.