Warm Engine Sag or Acceleration Surge

Models
All 1984-1985 Federal & 1985 California Domestic Passenger Cars Equipped With 2.6L Engine


Subject
Warm Sag/ Acceleration Surge


Index
DRIVEABILITY


Date
April 15, 1985

No.
18-15-85



SYMPTOM/CONDITION

A warm engine may exhibit a sag (lack of power) when attempting to accelerate from rest and/or surge during acceleration.

DIAGNOSIS

Road test vehicle, If warm sag and/or acceleration surge is noted, disconnect EGR valve and road test vehicle again. If condition is improved, proceed to repair procedure.





PARTS REQUIRED



REPAIR PROCEDURE

Installation

1. Remove distributor cap and lay aside.

2. Remove two rotor screws and remove rotor.






3. Remove governor assembly bolt (Figure 1).

NOTE:
BOLT IS TIGHT, IT IS RECOMMENDED THAT A BOX WRENCH OR SOCKET WRENCH BE USED.





4. Remove governor assembly and install new governor set, PN MD607474 (Figure 2).

5. Install governor assembly bolt and torque to 36 to 42 inch pounds.

NOTE:
IF VEHICLE IS EQUIPPED WITH A 3-PORT THERMO VALVE, PROCEED TO STEP 11.

6. Drain coolant.

7. Vehicles equipped with fuel reservoir will need to set it aside by removing the thermostat housing bolt that secures the reservoir.

8. Remove coolant temperature sensor (2-wire) and temperature gauge sending unit (1- wire) to gain access to thermo valve.

9. Remove connector from thermo valve.

10. Remove thermo valve and replace with provided thermo valve, PN MD081274.

11. Remove and discard existing carburetor secondary diaphragm hose.





12. Install provided vacuum hose assembly, PN MD097333, to 3-port thermo valve, carburetor secondary diaphragm, and nipple on carburetor base (Figure 3).

13. Connect two hoses from original thermo valve connector to upper two nipples on new 3-port thermo valve connector (Figure 3).

NOTE:
IF VEHICLE WAS ALREADY EQUIPPED WITH 3-PORT THERMO VALVE, PROCEED TO STEP 17.

14. Reinstall coolant temperature sensor and temperature gauge sending unit.

15. Reinstall fuel reservoir, if so equipped. Apply Loctite/Mopar Sealant, PN 4318034, to the bolt threads before reinstalling. Torque bolt to 12 to 17 foot pounds.

16. Add coolant.

17. Install distributor rotor and cap.

18. Disconnect vacuum hoses from EGR valve and remove EGR valve.

19. Install provided EGR valve, PN MD097314, using gasket, PN MD026567, provided. Reconnect vacuum hoses.

20. Start engine and bring to full operating temperature so curb idle can be attained.



21. Disconnect and plug distributor vacuum advance hose.

22. Set basic timing to 7~ BTDC.

23. Remove plug and reconnect distributor vacuum advance hose.

24. California vehicles only - clean the existing hose routing label surface and apply hose routing label, PN 4179571.

25. 1984 Federal vehicles only - remove the right front kick panel and note the part number on the electronic control unit. If any part number other than MD080152 is present, replace ECU with PN MD080152.





26. Type the Authorized Modification Label, PN 4275086, as shown in Figure 4.


POLICY:
Reimbursable within the provisions of the warranty


TIME ALLOWANCE:
Labor Operation No. 25-01-45-97......1.5 Hrs.


FAILURE CODE:
AM - Authorized Modification