Throttle Body: Testing and Inspection

Fig. 61 PCV Valve:

1. Warm engine in Park or Neutral until the cooling fan has cycled on and off at least once.
2. Ensure that all accessories are off.
3. Shut off engine.
4. Disconnect the PCV valve hose from the intake manifold nipple (Fig. 61). Cap the PCV valve.

Fig. 62 Purge Hose:

5. Disconnect purge hose from the nipple on the throttle body (Fig. 62).
6. Use a piece of hose to attach Air Metering Orifice 6457 (0.125 in. orifice) to the purge nipple on the throttle body (Fig. 63).
7. Connect the DRB or scan tool to the data link connector inside the passenger compartment.
8. Restart the engine and allow engine to idle for at least one minute.
9. Using the DRB scan tool, access Minimum Airflow Idle Speed.
10. The following will then occur:
- Idle air control motor will fully close
- Idle spark advance will become fixed
- DRB scan tool displays engine RPM

IDLE SPECIFICATION CHART

Odometer Reading Idle Speed

Less than 1000 miles 540-840 RPM
More than 1000 miles 600-840 RPM

11. If idle RPM is within the range shown in the Idle Specification chart, throttle body minimum airflow is set correctly.
- If idle RPM is above specifications, use the DRB scan tool to check idle air control motor operation.
- If idle air flow is below specification, shut off the engine and clean the throttle body as follows:
a. Remove the throttle body from engine.
b. While holding the throttle open, spray the entire throttle body bore and the manifold side of the throttle plate with Mopar Parts Cleaner. Only use Mopar Parts Cleaner to clean the throttle body.
c. Using a soft scuff pad, clean the top and bottom of throttle body bore and the edges and manifold side of the throttle blade. The edges of the throttle blade and portions of the throttle bore that are closest to the throttle blade when it is closed, must be free of deposits.
d. Use compressed air to dry the throttle body
e. Inspect throttle body for foreign material.
f. Install throttle body on manifold
g. If the minimum air flow is still not within specifications, the problem is not caused by the throttle body.

WARNING: Clean throttle body in a well ventilated area. Wear rubber or butyl gloves. Do not let Mopar parts cleaner come in contact with eyes or skin. Avoid ingesting the cleaner. Wash thoroughly after using cleaner.

13. Shut off engine.
14. Remove Air Metering Orifice 6457 Install purge hose.
15. Remove cap from PCV valve. Connect hose to PCV valve.
16. Remove DRB scan tool.