However, to properly run a diagnostic test that would cover most potential emission-related issues, a drive cycle should include a combination of the following:
* Warm-up: Driving for several minutes at a moderate speed (around 25-30 mph) to allow the catalytic converter and other emission components to reach operating temperature.
* Acceleration: Several periods of moderate to hard acceleration from a stop, reaching speeds of at least 45-50 mph.
* Cruising: Extended periods (several minutes) of constant speed driving at approximately 30-40 mph.
* Deceleration: Periods of coasting (removing your foot from the accelerator) without braking.
* Idle: Several minutes of idling at a stop, after the engine is fully warmed up.
Important Considerations:
* OBD-II Readiness Monitors: Your 1996 Mercury Tracer likely uses an OBD-II system (check under the hood or your owner's manual), but the specific monitors and their requirements might vary slightly. A scan tool capable of reading OBD-II codes and readiness monitors will be your best guide. Some monitors might require more extreme driving conditions than what's listed above.
* No Specific Time or Distance: There's no set time or distance for a complete drive cycle. The goal is to trigger all the relevant monitors, which will depend on the specific vehicle's requirements and the completeness of the driving conditions. If you're working with a scan tool, watch the readiness monitors' status.
* Professional Diagnostic: If you're having trouble with emissions or getting ready for an emissions test, it's best to consult a professional mechanic who can properly diagnose the problem and ensure the drive cycle is completed accurately using a scan tool.
In short, while the above provides a good general guideline, aiming for a varied driving experience that encompasses these elements will likely be sufficient to trigger most diagnostic monitors. Using an OBD-II scan tool is highly recommended for monitoring progress.
