1997 Ford Ranger Owner Guide 1st Printing - Page 276

Because your vehicle's engine is electronically controlled by a computer, some control conditions are maintained by power from the battery. If you ever disconnect the battery, install a new battery, or experience a dead battery, you must allow the computer to "relearn" its idle conditions before your vehicle will idle at its best. To let the engine do this, apply the parking brake, put the gearshift in P (Park) (automatic transmission) or Neutral (manual transmission), turn off all the accessories, and start the vehicle. Let the engine idle for at least one minute. If you do not let the engine relearn its idle, the idle quality of your vehicle may be adversely affected until the idle is relearned. Your vehicle will eventually relearn its idle while you drive it, but it takes much longer than if you use the previous procedure. WARNING Batteries normally produce explosive gases which can cause personal injury. Do not allow flames, sparks or lit tobacco to come near the battery. Always cover your face and protect your eyes and also provide ventilation. WARNING Batteries contain sulfuric acid which burns skin, eyes, and clothing. If the acid touches someone's skin, eyes, or clothing, immediately flush the area with water for at least 15 minutes. If someone swallows the acid, have him or her drink lots of milk or water first, then Milk of Magnesia, a beaten egg, or vegetable oil. Call a doctor immediately. 276