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HOMESERVICE MANUALSBUICK1982REGAL SPORT, TRANS MFR CD 350C/MX5REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETUNE-UPTUNE-UP - 6 CYLIDLE MIXTUREMIXTURE CONTROL ADJUSTMENTALL EXCEPT 2.8L (VIN 1) ENGINE
1982 Buick Regal Sport, Trans Mfr CD 350C/MX5

All Except 2.8L (VIN 1) Engine

1982 Buick Regal Sport, Trans Mfr CD 350C/MX5SECTION All Except 2.8L (VIN 1) Engine
  1. Mixture control solenoid should be checked before adjustment. Stop engine and remove air cleaner. Insert thin metal scale in "D" shaped hole in air horn. Press down to determine travel of solenoid. Total movement should be 1/8".
    NOTE: If solenoid movement is not correct, see Rochester E2ME and E4ME Carburetor articles in FUEL SYSTEMS Section for adjustment procedures.
  2. To adjust idle air bleed valve, set parking brake and block drive wheels. Disconnect and plug hoses as directed on Emission Control Tune-Up decal in engine compartment. Check ignition timing and adjust if necessary.
  3. Connect a dwell meter to lead wire from mixture control solenoid in carburetor, then set dwell meter on 6 cylinder scale. Start engine and run at idle until normal operating temperature is reached and a varying dwell is noted on dwell meter.
    NOTE: It is absolutely essential that engine is operated for a sufficient length of time to ensure the engine coolant sensor, and the oxygen sensor in the exhaust, are at full operational temperature.
  4. Adjust curb idle speed (on models with ISC, do not adjust). Observe dwell reading. If dwell needle is moving, no adjustment is necessary. If needle is fixed at one point, proceed with adjustment.
  5. With engine stopped, cover carburetor air intakes and vents with tape. Drill rivet heads on idle air bleed plug (above primary bores). Remove plug and blow out metal chips and rivet pieces. Start engine, run until warm, and adjust idle air bleed valve with screwdriver until dwell varies within 25-35° range.
    CAUTION: Perform this step carefully. The idle air bleed valve is very sensitive in controlling air/fuel ratios and the valve should be turned only in 1/8 turn increments.
  6. If after performing this adjustment, the dwell reading does not vary and is not within the 25-35° range, it will be necessary to remove carburetor to gain access to the plugs covering the idle mixture needles and adjust the idle mixture as follows:
  7. Turn screws until lightly seated. Back out screws 3 1/2 turns. Reinstall carburetor and check dwell when engine is warm.
  8. If dwell is below limits turn screws out in 1/8 turn increments. If above limits, turn screws in at 1/8 turn increments. Reset idle speed if necessary. Remove all test equipment and reconnect all hoses.
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.