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HOMESERVICE MANUALSBUICK1982REGAL SPORT, TRANS MFR CD 350C/MX5REPAIR AND DIAGNOSISENGINE PERFORMANCEFUEL DELIVERYROCHESTER E4MC & E4ME 4-BARRELADJUSTMENTSMIXTURE CONTROL SOLENOID
1982 Buick Regal Sport, Trans Mfr CD 350C/MX5

Mixture Control Solenoid

1982 Buick Regal Sport, Trans Mfr CD 350C/MX5SECTION Mixture Control Solenoid
  1. Solenoid operation can be checked on vehicle using external float level gauge tool (J-9789-130). Some material must be removed from the side of the tool to allow for clearance in air horn.
  2. Remove air cleaner and gasket. Insert gauge in "D" shaped vent hole in casting next to Idle Air Bleed Valve plug. Make sure gauge moves freely in hole.
  3. Press down on gauge and release. With gauge released (solenoid up position), read inch mark on gauge that lines up with top of air horn casting and record reading.
  4. Lightly press down on gauge until it bottoms (solenoid down position). Read inch mark that lines up with air horn casting.
  5. Subtract solenoid up position from solenoid down position. Difference is total solenoid travel. Travel should be 3/32-5/32" (1/8" preferred). If correct, proceed to IDLE AIR BLEED VALVE ADJUSTMENT  in appropriate Tune-Up Service Procedure Article.
  6. To adjust, remove air horn. Turn mixture control solenoid screw clockwise. Record number of turns required to lightly bottom screw in float bowl.
    Fig 1: Installing Lean and Rich Mixture Stop Screws in Air Horn
    G09315762Courtesy of GENERAL MOTORS COMPANY
  7. If number of turns is not 2 1/2-3 1/4-solenoid travel is incorrect. Adjust screw to 3 turns from bottom. Invert air horn and using a small punch, drive mixture control solenoid screw plug out of air horn from bottom side. Discard plug.
  8. Reinstall air horn and new gasket on float bowl and temporarily secure with 2 screws. Recheck solenoid plunger travel (3/32-5/32"). If travel is correct, complete assembly of air horn and proceed to step  11).
  9. If solenoid travel is incorrect, remove and invert air horn assembly. Using suitable tool (J-28696-4), remove rich mixture stop screw from bottom side of air horn. Then, drive screw plug out of air horn from bottom side. Discard plug. Reinstall rich mixture stop screw in air horn until screw is lightly bottomed.
  10. Reinstall air horn and gasket on float bowl. Insert gauge in vent hole. Using suitable tool (J-28696), turn stop screw clockwise until total solenoid plunger travel is 1/8".
  11. After solenoid travel is correctly set, install new plugs supplied in service kit. Install mixture solenoid screw plug (hollow end down) into hole in raised boss of air horn casting. Using a small punch, drive plug into air horn until upper surface of plug is even with lower edge of hole chamfer. See Fig 1.
    NOTE: Plug must be installed to retain the setting of the mixture control solenoid stop screw in float bowl and to prevent escape of fuel vapors.
  12. If removed, install plug (hollow end down) in air horn over rich mixture stop screw (located next to idle air bleed valve cover). Using a small punch, drive new plug into place until it is approximately 1/16" below the surface of air horn casting.
    NOTE: Plug must be installed to retain setting of rich mixture stop screw.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.