Analyze previous emissions test results

Visually inspect required emission control devices

Run pre-test test to establish baseline emissions under state required testing conditions

Check PCV system

Check ignition timing and advance operation

Check vacuum hose routing

Check coolant level and engine operating temperature

Perform cylinder power balance test

Check for diagnostic trouble codes and identify any pertinent codes

Check fuel pressure

Analyze engine data parameters (if applicable)

Analyze data and recommend necessary repairs