Ford 1997 Aerostar 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:
20 minutes of driving in stop and go
city-type traffic with at least four idle periods.
10 minutes of driving on an expressway or
highway.
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
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