S15/T15 Jimmy 2WD V6-173 2.8L VIN B 2-bbl (1983)
Air/Fuel Mixture: Adjustments
Rochester E2SE (California)
NOTE: The E2SE carburetor has been calibrated at the factory and should not normally need adjustment in the field. For this reason, the mixture
adjustment should never be changed from the original factory setting. However, if during diagnosis, the "System Performance Check" indicates the
carburetor to be the cause of a Driver Performance Complaint, or emissions failure the carburetor can be adjusted using the following procedure. After
adjustment, cover plugged areas with RTV rubber or equivalent.
Idle Mixture Needle Plug Removal
Lean Mixture And Idle Mixture Adjustments
CARBURETOR PRE-SET PROCEDURE:
1. Remove carburetor from engine following normal service procedures to gain access to plug covering the idle mixture needle. Remove plug.
2. Turn mixture screw in until lightly seated and back out 4 turns.
3. If the plug in air horn covering idle air bleed has been removed, replace air horn. If plug is still in place, do not remove plug.
4. Remove vent stack screen assembly to gain access to lean mixture screw. (Be sure to reinstall vent stack screen assembly after adjustment).
5. Turn lean mixture screw in until lightly bottomed and back out 2-1/2 turns. Some resistance should be felt. If no resistance, remove screw and
check for spring.
