Engine - Power Loss/Cold Sag/Surge

84chrysler6

Models

1983 Federal & California & 1984 California Domestic Passenger Cars Equipped With 2.6L Engine


Subject


Part Throttle Loss of Power (Sag), Cold Drive Sag & Warm Surge


Index


FUEL

Date July, 1984

(current) No..


14-26-84
SYMPTOM/CONDITION

^ Part Throttle Loss of Power (Sag) - Engine will intermittently loose power (sag) suddenly while driving at a constant road speed, usually at highway speed, but could also occur in city traffic.

This condition is usually characterized by having a good idle and has wide open throttle, but is substantially weaker because it still lacks primary venturi fuel supply when the loss of part throttle power occurs.

^ Cold Drive Sag - This condition occurs normally on a medium or heavy acceleration which allows actuation of the carburetor secondary.

^ Vehicle may exhibit a warm surge.

DIAGNOSIS

Because of the difficulty in duplicating these conditions in the shop or on a road test, the repairs for each are being released as a package and should be installed as such.

PARTS REQUIRED

Driveability Package PN 4342770

Consists of:

1 - Primary Jet Block & Gasket Package PN MD082907
1 - Float Chamber Cover Gasket PN MD608135
1 - Enrichment Jet PN MD608003
1 - Vacuum Harness Overlay NPN
1 - Hose Routing Label-California Passenger Car NPN
1 - Carburetor Flange Gasket PN MD025344
1 - Choke Cover Screw Kit PN MD606977
Must be ordered separately:

1 - Authorized Modification Label PN 4275086

REPAIR PROCEDURE

1. Remove carburetor air cleaner crossover.

2. Drain and save approximately one gallon of coolant.

3. To prepare carburetor for removal, disconnect vacuum hoses, canister lines, throttle linkage, return spring and, when so equipped, cruise control cable and bracket, water inlet hose, and 10 mm nut next to sub-EGR valve linkage.

NOTE: IT IS RECOMMENDED BEFORE REMOVING CARBURETOR FROM MANIFOLD THAT THE SIX (6) AIR HORN SCREWS BE LOOSENED USING A HAND IMPACT TOOL WITH A #2 PHILLIPS BIT, A RACHET WRENCH, OR A #2 PHILLIPS SCREWDRIVER BY LIGHTLY TAPPING WITH A HAMMER ON THE END OF THE SCREWDRIVER. (DO NOT REMOVE SCREWS AT THIS TIME, JUST LOOSEN THEM.)

4. Remove the four (4) hold-down bolts that pass through carburetor, then remove carburetor for disassembly.

5. For carburetor disassembly, follow procedures in the respective year service manual.

CAUTION: WHEN SEPARATING THE AIR HORN FROM MAIN BODY, DO NOT PRY ON ANY SOLENOIDS.

FIGURE 1:

FIGURE 2 - ILLUSTRATION OF INSTALLATION:

6. With air horn assembly inverted on bench, remove primary jet block (note cast "P" on side of block) and install replacement (Figure 1) transfer primary main jet from removed block to replacement. Use new gasket supplied in jet block package (Figure 2).

FIGURE 3:

7. Remove enrichment jet valve and cover (Figure 3).

8. Remove existing enrichment jet and install new Enrichment Jet PN MD608003 (Figure 3). Reinstall cover.
9. Reassemble carburetor using new Bowl Cover Gasket, PN MD608135, and install on vehicle. Use five (5) new Brake-Off Type Screw, PN MD606977, to reinstall choke cover assembly. Use new Carburetor Flange-to-Intake Manifold Gasket, PN MD025344, and install carburetor.

10. Reinstall coolant drained in Step 2. Start engine and check for leaks and allow to fully warm up.

11. Check curb idle rpm, readjust if necessary.

FIGURE 4:

FIGURE 5:

12. Locate upper thermo valve "B". This valve controls secondary EGR valve operation (Figure 4). Remove and discard the vacuum hose connecting nipple "A" of valve (Figure 5) to vacuum tee.
13. Remove and discard existing carburetor secondary chamber hose.

FIGURE 4:

14. Install Vacuum Harness, PN MD084104, as shown in Figure 4.

Special care should be used in routing hoses to insure against crimping or kinks. Trim excess hose if necessary.
15. California Vehicles Only - Clean surface of existing hose routing label and attach supplied hose routing label over it.

FIGURE 6:

16. Type the following information on the Authorized Modification Label PN 4275086 (Figure 6).
Upper Section

"Installed Driveability Package PN 4342770."

Lower Section

Change Authority - TSB #14-26-84. Dealer Code - your dealer code. Date - date this service performed.

Install label next to or near original VECI label.


POLICY: Reimbursable within the provisions of the warranty


TIME ALLOWANCE:
Labor Operation No. 14-26-84-90........................... 1.4 Hrs.


FAILURE CODE: AM - Authorized Modification