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Idle Speed

  1. Idle speed is controlled by an idle speed actuator. Ensure engine is at normal operating temperature, valve clearance is correct and all electrical accessories are off.
  2. Connect dwell/tachometer to engine. Ensure idle speed is within specification. See IDLE SPEED & CO LEVEL SPECIFICATIONS table. If idle speed and CO level are not within specification, check idle speed actuator or intake manifold for air leaks.
IDLE SPEED & CO LEVEL

Application Idle RPM (1) CO Level %
6-Cylinder 660-740 .2-1.2
(1) Measured at exhaust manifold. See IDLE MIXTURE & CO LEVEL for additional information.
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