Accelerator Pump - Engine Sag/Hesitation On Acceleration

91amcjeep05

NO.: 18-54-91

GROUP: DRIVEABILITY

DATE: July 1, 1991


SUBJECT: Engine Sag/Hesitation on Acceleration


MODELS:

1981-91 (15/SJ) GRAND WAGONEER


SYMPTOM/CONDITION:

Vehicle may exhibit an engine sag/hesitation upon acceleration (throttle tip-in). This condition may occur with warm or cold engine.


DIAGNOSIS:

Verify sag/hesitation symptoms. If a worn accelerator pump appears to be the cause of the condition, perform the following repair.


PARTS REQUIRED:

1 Accelerator Pump Housing/Diaphragm Package 4713163

Package Contents:
1 Accelerator Pump Housing 4713164
1 Accelerator Pump Diaphragm 4713165

Figure 1:

REPAIR PROCEDURE:

This repair involves replacement of the accelerator pump housing and diaphragm with a revised one.

1. Remove the accelerator pump housing retaining bolts and pull the accelerator pump components from the carburetor body (Figure 1).

2. Disconnect the accelerator pump rod from the pump arm.

3. Install the accelerator pump rod to the pump arm on the new pump housing.

4. Being sure that the carburetor-body-to-accelerator-pump-housing surface is clean, install the new accelerator pump components in the carburetor body.

5. Install the accelerator pump housing retaining bolts and tighten.

6. Perform the "Accelerator Pump Stroke Adjustment" procedure as outlined in the fuel section of the appropriate service manual.


POLICY: Reimbursable within the provisions of the warranty.


TIME ALLOWANCE:
Labor Operation No. 14-30-39-92 . . . . . . . . . . . . . . . 0.5 Hrs.


FAILURE CODE: 37 - Excessive Wear