1997 Ford Aerostar Owner's Manual - Page 270

Do not drive your vehicle if it does not operate properly. See your dealer if the engine runs on for more than five seconds after you shut it off or if it misfires, surges, stalls, or backfires. Information about your vehicle's emission control system is on the Vehicle Emission Control Information decal located on or near the engine. This decal identifies engine displacement and gives some tune-up specifications. How to Prepare Your Vehicle for Inspection/Maintenance (I/M) Testing In some localities it may become a legal requirement to pass an Inspection/Maintenance (I/M) test of the On-Board Diagnostic (OBD) II system. If the vehicle's powertrain system or its battery has just been serviced, the OBD II system is reset to a not ready for I/M testing condition. To prepare for I/M testing, the law specifies that additional mixed city and highway driving is required to complete the check of the OBD II system. The driving modes required to reach the ready condition consist of a minimum of 30 minutes of city and highway driving as described below: u 20 minutes of driving in stop and go highway. city-type traffic with at least four idle periods. u 10 minutes of driving on an expressway or Before completing the above driving modes, the engine must be warmed up and at operating temperature. Once started, the vehicle must not be turned off during the above driving modes. If the vehicle owner is unable to meet the I/M requirements by using these driving patterns, an 271