Mixture Adjustment B

Fig. 6 Idle air bleed valve identification. E2MC-ME & E4MC-ME carburetors:

Fig. 7 Idle air bleed valve adjustment. E2MC-ME & E4MC-ME carburetors:

1. Install gauging tool J-33815-2 or equivalent in ``D'' shaped hole on throttle side of air horn, with end of tool positioned above open cavity next to idle air bleed valve, Fig. 7.
2. Hold gauge down lightly to bottom MC solenoid plunger and adjust idle air bleed valve so that tool will pivot over and just contact top of valve. Remove gauging tool.
3. Remove plugs covering idle mixture adjusting screws as outlined in ``Concealment Plug Removal'' in the Carburetor Section. Turn mixture screws in (clockwise) until lightly seated, then back screws out 3 turns.
4. Reinstall carburetor using a new gasket, with air cleaner removed and vacuum hoses disconnected and plugged as outlined on underhood Emission Control Information Label.
5. Start engine and run until it reaches normal operating temperature and dwell begins to fluctuate.
6. Place automatic transmission in drive (manual transmission in neutral) and adjust mixture screws equally to obtain a fluctuating dwell reading between 25° and 35° (as close to 30° as possible). Turn mixture screws equally, 1/8 turn per adjustment, allowing time between adjustments for engine to stabilize. If dwell reading is below 25°, turn screws counterclockwise; if reading is above 35° turn screws clockwise.
7. If unable to obtain specified dwell reading, refer to diagnosis in the Emission Control Section.
8. Stop engine. Seal mixture screw cavities with RTV sealer and install idle air bleed valve cover.
9. Install air cleaner and reconnect vacuum hoses, then ensure curb idle speed is within specifications.