1982 Honda Prelude Automatic TransFACTORY OEM SERVICE PROCEDURE

System Check

  1. With engine cold, disconnect vacuum hose from EGR valve at manifold and connect vacuum gauge to hose. Start engine and slowly raise to 4500 RPM. No vacuum should be shown on gauge.
  2. If vacuum is present, check for voltage at EGR control solenoid valve A (Blue/Yellow wire at emission control box connector on Accord models or Blue wire at box #2 on Civic and Prelude models).
  3. If voltage is present, replace EGR control solenoid valve A (on left side of front row of emission control box on Accord models or on box #2 on Civic and Prelude models) and retest. If no voltage, check wiring, fuse and thermosensor.
  4. Disconnect vacuum hose from EGR valve and connect vacuum gauge to hose. Push positive probe of voltmeter into Blue/Yellow terminal at the control box connector on Accord models or into Blue terminal at control box #2 on Civic and Prelude models. Put negative probe to ground.
  5. Raise front of vehicle and support with safety stands. Start engine and warm to normal operating temperature (cooling fan on). Vacuum and voltage should match specifications given in "EGR System Test" chart.
  6. If all readings are correct, check EGR valve for proper operation. If vacuum of more than 2 in. (51 mm) Hg. is noted (but no voltage) replace EGR control valve and check vacuum hose routing. If any other readings are not correct, perform all other tests in sequence.
    EGR SYSTEM TEST

    Condition of Engine EGR Valve Vacuum Blue/White Wire Voltage
    Idle None None
    4500 RPM Yes None
    4500 RPM (Blocked EGR Bleed) (1) Less Than 2 in. Hg None
    Hard Acceleration over 15 MPH (2) Yes None
    Deceleration over 15 Mph 2 None Yes
    (1) See Figure.
    (2) In second gear or "2".
Factory Service Tools

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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.