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 MANUALSFORD1991TAURUS L, 4D SEDAN, 3.8 4REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/O CODES - GASOLINESYMPTOM-TO-ROUTINE MENU
1991 Ford Taurus L, 4D Sedan, 3.8 4
Symptom-To-Routine Menu
1991 Ford Taurus L, 4D Sedan, 3.8 4SECTION Symptom-To-Routine Menu
SYMPTOM-TO-DIAGNOSTIC ROUTINE MENU
| Title | Routine |
|---|---|
| No cranking and will not start | 200 |
| Cranks normally but won't start | 201 |
| Starts normally but won't run (stall) | 202 |
| Cranks normally but slow to start | 203 |
| Rough idle | 204 |
| Misses under load | 205 |
| Low idle (stalls on deceleration or quick stop) | 206 |
| Hesitates or stalls on acceleration | 207 |
| Backfire (induction or exhaust) | 208 |
| Lack of power | 209 |
| Surges at steady speed | 210 |
| High idle (engine diesels) | 211 |
| Engine noise | 212 |
| Poor fuel economy | 213 |
| High oil consumption | 214 |
| Spark knock/pinging | 215 |
| Engine vibrates at normal/high speeds | 216 |
| Engine runs cold | 217 |
| Engine runs hot | 218 |
| Exhaust smoke | 219 |
| Gas smell | 220 |
| "CHECK ENGINE"/"SERVICE ENGINE SOON" Light always On or never On, "CHECK ENGINE"/"CHECK DCL" Message on | 221 |
| State emission test failure | 222 |
| Improper shift | 223 |
| Shift Indicator Light and Audible chimes "ON" | 224 |
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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.