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Home >> Jeep >> 1999 >> Cherokee Sport, 2D Utility, 4WD, Part Time, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Engine Component Tests >> Emission Systems & Sub-Systems >> Crankcase Ventilation (CCV) System >> CCV System
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CCV System

  1. This system is used on 2.5L and 4.0L engines. It performs same function as a conventional PCV system, but does not use a vacuum controlled valve. Ensure locations of fixed orifice fitting and air inlet fitting have not been exchanged. Fixed orifice fitting is Gray and is located at rear of valve cover. Air inlet fitting is Black and is located at front of valve cover.
  2. Remove fixed orifice fitting from valve cover and leave tube attached. Start engine and let idle. A hissing noise should be heard from fitting orifice. Also, a strong vacuum should be felt with a finger placed at fitting inlet. If vacuum is not present, remove fitting. If vacuum is now present at tube, replace fitting. Do not attempt to clean fitting. If vacuum is not present at tube, go to next step.
  3. Check tube for kinks or obstruction. Clean tube fitting at intake manifold, if necessary. A 1/4" drill may be used (by hand) to dislodge any solid particles. Reinstall fixed orifice fitting and tube. Disconnect air inlet fitting and hose from front of valve cover.
  4. Hold a piece of stiff paper loosely over opening in valve cover. Allow engine to idle for one minute. Paper should be drawn against rubber grommet in valve cover by vacuum in crankcase. If vacuum is not present, check tubes for restrictions or obstructions.
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