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HOMESERVICE MANUALSCHEVROLET1987MONTE CARLO LS, 4.3 ZREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEADJUSTMENTTUNE-UP - V6ADJUSTMENTSMIXTURE CONTROL ADJUSTMENTE2ME CARBURETOR
1987 Chevrolet Monte Carlo LS, 4.3 Z

E2ME Carburetor

1987 Chevrolet Monte Carlo LS, 4.3 ZSECTION E2ME Carburetor
  1. Mixture control solenoid plunger travel should be checked before adjustment. Stop engine and remove air cleaner and gasket. Insert Float Gauge (J-34935-1 or BT-8420-A) in "D" shaped hole in air horn (next to idle air bleed valve cover). It may be necessary to grind material off gauge to allow it to enter the vent hole.
  2. Press down on gauge to determine travel of plunger. Total movement should be 2/32-6/32" (2.4-4.8 mm). If solenoid movement is not correct, carburetor must be disassembled and adjusted. See ROCHESTER E2ME 2-BARREL in FUEL SYSTEMS section. If solenoid movement is correct, proceed to step 3).
  3. Set parking brake and block drive wheels. Disconnect and plug canister purge hose. Connect tachometer. Check ignition timing and adjust if necessary.
  4. Connect a dwell meter to Green wire from mixture control solenoid in carburetor. 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: Run engine long enough to ensure engine coolant sensor and oxygen sensor are at full operational temperature.
  5. Adjust curb idle speed (on models with ISC, do not adjust). With engine idling in Neutral (man. trans.) or "D" (auto. trans.), observe dwell reading. If dwell needle is moving within 10-50°, no adjustment is necessary. If needle is fixed at one point or outside this range, see SYSTEM PERFORMANCE CHART in COMPUTER CONTROLS article in COMPUTER CONTROLS section. Return to next step if flow charts indicate carburetor adjustments, calibration or service are necessary.
  6. With engine stopped, cover carburetor air intakes and vents with tape. Drill rivet heads on idle air bleed cover (above primary bores). Remove plug and blow out metal chips and rivet pieces.
  7. Install Air Bleed Valve Gauging Tool (J-33815-2 or BT-8253-B) in "D" shaped hole on throttle side of air horn. Position gauge so upper end is over open cavity next to idle air bleed valve. See Figure .
  8. Lightly hold gauge down to seat solenoid plunger against its stop. Adjust idle air bleed valve so that gauge will pivot over and just touch top of valve. Remove gauge.
    CAUTION: The idle air bleed valve is very sensitive. It should be turned only in 1/8 turn increments.
  9. 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 plugs covering the idle mixture screws.
  10. Turn mixture screws in until lightly seated. Back screws out 3 turns. Reinstall carburetor with new flange gasket. Disconnect and plug canister purge hose. Bring engine to normal operating temperature and check dwell.
  11. While idling in Drive (Neutral for manual transmissions), adjust mixture needles equally until dwell reading is within 25-35°. Dwell should be as close to 30° as possible. Allow reading to stabilize after each adjustment.
  12. Seal idle mixture screws with silicone sealant or RTV. Reset idle speed on models without ISC. Remove test equipment and reconnect all hoses.
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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.