Mixture Adjustment B

Fig. 9 Idle air bleed valve adjustment. E2MC-ME & E4MC-ME carburetors:

TOOLS REQUIRED (or equivalents)
^ J-33815-2 or BT-7610B

PROCEDURE "A"
1. Install gauging tool J-33815-2 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. 9.
2. Hold gauge down lightly to bottom Mixture Control (MC) solenoid plunger, then adjust idle air bleed valve so 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. 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 vehicle emissions 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 adjust dwell to specifications, or if reading does not fluctuate, refer to Computers and Controls / System Diagnosis / System Performance Check / C-3 System.
8. Stop engine. Seal mixture screw cavities with RTV sealer and install bleed valve cover.
9. Reinstall air cleaner and reconnect vacuum hoses, then check curb idle speed.