Durango 4WD V8-5.9L VIN Z (1998)
Idle Speed: Testing and Inspection
The following test procedure has been developed to check throttle body calibrations for correct idle conditions. The procedure should be used to
diagnose the throttle body for conditions that may cause idle problems. This procedure should be used only after normal diagnostic procedures have
failed to produce results that indicate a throttle body related problem. Be sure to check for proper operation of the idle air control motor before
performing this test.
Fig. 73 Fixed Orifice Tool
A special fixed orifice tool (number 6714) must be used for the following test.
1. Start the engine and bring to operating temperature. Be sure all accessories are off before performing this test.
2. Shut off the engine and remove the air cleaner element housing.
Fig. 74 Install Orifice Tool
3. Disconnect the vacuum line at the PCV valve.
4. Install the 0.185 inch orifice tool (number 6714) into the disconnected vacuum line in place of the PCV valve.
Fig. 75 Idle Purge Line
