Cannot clear drive cycle

How many miles have you driven and under what conditions? I have to be honest, at present, I have a vehicle I'm driving to clear the system test and after 140 miles, I still have two incomplete. It is a frustrating condition especially not that I have nearly 3 hours into driving and the customer wants the vehicle back. I can't get it through emissions with two incomplete.

So with that, tell me what was done to the vehicle for you to clear codes. That way I can check if anything specific is needed for a drive cycle on you particular vehicle.

Otherwise, here is the general information on drive cycle on your vehicle. The attached pic correlates with the directions.

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1997 Mercury Truck Villager V6-181 3.0L SOHC VIN 1 EFI
Trips and Drive Cycles
Vehicle Powertrain Management Computers and Control Systems Description and Operation Components Trips and Drive Cycles
TRIPS AND DRIVE CYCLES
TRIP
A trip is defined as a Key-On, Key-Off event in which the Powertrain Control Module (PCM) detects the following:
1. Engine coolant should exceed 70°C (158°F).
2. Engine coolant temperature should change more than 20°C (68°F) after starting the engine.
3. Engine speed should go over 400 RPM.

When the PCM detects an emission related Diagnostic Trouble Code (DTC), it uses the trip information to make its decision on whether to illuminate the Malfunction Indicator Lamp (MIL).

TRIP DISPLAY ON SCAN TOOL
The on-board system readiness function is available on all scan tools. This function indicates the status of each OBD II monitor. One Parameter Identification Display (PID) on a Rotunda New Generation STAR (NGS) Tester 007-00500 summarizes the status of all monitors.

TRIPS AND MALFUNCTION INDICATOR LAMP FUNCTION
Trips are used by the software strategy to control the MIL OFF function. The MIL is turned ON after an emission related DTC is stored in memory. The MIL is turned OFF if there are three consecutive drive cycles without the identical fault under similar conditions or three trips without the identical fault present. The actual number of drive cycles or trips necessary to control the MIL varies with each monitor.

DIAGNOSTIC TROUBLE CODES
A Diagnostic Trouble Code (DTC) will be stored in memory after the identical malfunction has been detected consecutively on at least two separate drive cycles (not necessarily completing a trip). A misfire detection monitor DTC can be stored immediately depending on the misfire type. A catalyst efficiency monitor DTC can be stored after three identical malfunctions are detected on three separate drive cycles. A DTC will be erased from memory after 40 engine warm-up cycles, except for misfire or fuel injection system DTCs which will be cleared after 80 warm-up cycles, if the malfunction has not been detected after the MIL is turned OFF. DTC memory storage requirements vary with each monitor.

DRIVE CYCLE
A drive cycle is a method of driving a vehicle to run all of the on-board diagnostics. It can also be a method of driving a vehicle to initiate and complete a specific OBD II monitor or trip. A drive cycle may be done in the service bay or may require specific drive modes such as a number of idle periods, steady vehicle speed per time, accelerations at certain throttle angles, etc.

OBD II DRIVE CYCLE
The OBD II Drive Cycle is a specific method used to perform all trip monitor tests, as well as the catalyst efficiency monitor test. Refer to Testing and Inspection / Procedures / Drive Cycle.

OBD II Monitors

See pic 1

INSPECTION/MAINTENANCE TESTING - OBD II SYSTEM READINESS MONITORS
In some areas of the country, it may become a legal requirement to pass an Inspection/Maintenance (I/M) test of the OBD II system. Before I/M testing can proceed, the OBD II Drive Cycle must be performed and all of the diagnostic monitors completed successfully. During the mix of city and highway driving involved in the OBD II Drive Cycle, the diagnostic monitors will test certain parts of the OBD II software and hardware used to control vehicle emissions. While some of the monitors will run to completion and indicate a YES or NO, others such as misfire or fuel system will continuously run.

Let me know.
Joe