Computerized Engine Analysis

In order to meet Federal Exhaust Emission and Fuel Economy regulations, today's vehicles are equipped with highly sophisticated electronic engine control systems. These systems do not require periodic adjustments. The only services required on a scheduled basis are spark plug and filter replacement. Tune-ups, as we once knew them, are no longer necessary.

Engine Control Computer

The computer receives information from a network of sensors and switches that convert engine operating conditions into electrical signals. Based on the information and instructions stored in the computer program, commands are then sent to three primary systems:

• The ignition system
• The fuel system
• The emission control system

Sensors that monitor one or more of these systems include:

• The mass airflow sensor
• The throttle position sensor
• The manifold absolute pressure sensor
• The coolant temperature sensor
• The exhaust oxygen sensor
• The crankshaft position sensor
• The camshaft position sensor