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Throttle Body Minimum Airflow

NOTE: Throttle body minimum airflow procedure checks throttle body calibration for correct idle speed. Procedure may be used for idle speed problems caused by the throttle body. Throttle body minimum airflow procedure should be performed after all other diagnostic procedures have failed to produce results that indicate a throttle body related problem.
  1. Start and warm engine to normal operating temperature until electric cooling fan cycles on and off at least once. Ensure all accessories are off. Shut engine off.
  2. Disconnect PCV valve vacuum hose from intake manifold. Install cap on PCV valve vacuum hose fitting on intake manifold.
  3. Disconnect idle purge hoses from throttle bodies. See Fig 1 . Using small pieces of vacuum hoses, install .125" fixed orifice Air Metering Fitting (6457) on each idle purge hose fitting on each throttle body.
  4. Connect scan tool to Data Link Connector (DLC), located below driver's side of instrument panel. See Fig 2 .
  5. Start engine and allow to idle for at least one minute. Ensure all accessories are off. Using scan tool manufacturer's instructions, access MINIMUM AIRFLOW display on scan tool.
  6. When accessed, scan tool will display minimum airflow idle RPM. Minimum airflow idle RPM should be within specification. See the THROTTLE BODY MINIMUM AIRFLOW IDLE SPEED SPECIFICATIONS  table.
    Fig 1: Idle Purge Hose
    G95H14529Courtesy of CHRYSLER CORP.
    Fig 2: Identifying Data Link Connector
    G95I12789Courtesy of CHRYSLER CORP.
  7. If minimum airflow idle RPM is within specification, throttle body is okay. Go to step 11). If minimum airflow idle RPM is not within specification, go to next step.
  8. If minimum airflow idle RPM exceeds specification, check throttle body synchronization. See THROTTLE BODY SYNCHRONIZATION under THROTTLE BODY. Also, using scan tool, check Idle Air Control (IAC) motor operation. If IAC motor does not operate correctly, repair IAC motor as necessary. If throttle body synchronization is correct and IAC motor operates correctly, check for leaking intake manifold or gaskets and go to step 11).
  9. If minimum airflow idle RPM is less than specified, clean throttle bodies and check throttle body synchronization. See THROTTLE BODY CLEANING and THROTTLE BODY SYNCHRONIZATION under THROTTLE BODY. Also, using scan tool, check Idle Air Control (IAC) motor operation.
  10. If IAC motor does not operate correctly, repair IAC motor as necessary. If throttle body synchronization is correct and IAC motor operates correctly, replace throttle bodies. Go to next step.
  11. Remove air metering fitting(s). Reinstall vacuum hoses as necessary. Remove scan tool.
THROTTLE BODY MINIMUM AIRFLOW IDLE SPEED SPECIFICATIONS (1)

Application RPM
1000 Miles Or Less (2) 700-1000
More Than 1000 Miles (2) 750-1100
(1) Specs listed with Air Metering Fitting (6457) installed.
(2) Specs listed in accordance with vehicle mileage.
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