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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 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:
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Ignition System
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Fuel System
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Emission Control System
The
sensors that monitor one or more of these systems include:
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