Carburetor - Intermittent Engine Power Loss

84chrysler8

Models


1981 & 1982 2.6L Domestic Passenger Cars, Federal & California

1984 2.6L Caravan/ Voyager & Ram-Van, Federal & California


Subject


Part Throttle Loss of Power (Sag)


Index


FUEL

Date

February 13, 1984


No..


14-05-84


P-499-C
SYMPTOM/CONDMON

Engine will intermittently loose power (sag) suddenly while driving at a constant road speed, usually at highway speed, but sometimes in city traffic.

This condition is occasionally 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.


DIAGNOSIS

In trying to diagnosis this condition it may not be possible to duplicate the loss of power in the service shop area or even during a short road test due to the infrequency of the occurrence.


PARTS REQUIRED

1 - Jet Block and Gasket Package PN MD082907
1 - Float Chamber Cover Gasket PN MD608135
1 - Choke Cover Kit PN MD606977
1 - Authorized Modification Label PN 4275086


REPAIR PROCEDURE

Installation

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).
7. Reassemble carburetor using new Bowl Cover Gasket, PN MD608135, and install on vehicle. Use five new Brake Off Type Screw, PN MD606977, to reinstall choke cover assembly. Use new Carburetor Flange to Intake Manifold, PN MD025344, for U.S. vehicles; PN MD025434 for Canada.

8. Reinstall coolant drained in Step 1. Start engine and check for leaks and allow to fully warm up.

9. Check curb idle rpm, readjust if necessary.

FIGURE 3:

10. Type the following information on the Authorized Modification Label PN 4275086 (Figure 3).
Upper Section

Primary Jet Block Installed PN MD082907

Lower Section

Change Authority - TSB #14-49-83. Dealer Code - your dealer code. Date - date this service performed.

11. Install label next to or near the original VECI label.

POLICY: Reimbursable within the provisions of the warranty

FRONT WHEEL DRIVE LABOR OPERATION TIME SCHEDULE:

TIME ALLOWANCE:
Labor Operation No. 14-30-73-97.......................... 1.2 Hrs.

FAILURE CODE: RO - Driveability