LEMON Manuals: Even more car manuals for everyone
Home >> Mitsubishi >> 1996 >> 3000GT Base, Automatic >> Repair and Diagnosis >> Engine Performance >> Engine Controls - Adjustments >> Idle Speed & Mixture >> Basic Idle Speed

Basic Idle Speed

NOTE: ALWAYS check Throttle Position (TP) sensor adjustment after adjusting basic idle speed. See THROTTLE POSITION (TP) SENSOR  .
NOTE: For Data Link Connector (DLC) location, see TESTS W/CODES article.
NOTE: Ensure vehicle is at normal operating temperature with all lights, cooling fan and accessories off. Shift transmission into Neutral or Park position.
  1. Insert paper clip or appropriate probe into tachometer connector. See TACHOMETER CONNECTOR LOCATION  table. Connect a primary voltage detecting type tachometer to paper clip.
  2. Connect a jumper wire between data link terminal No. 1 and vehicle ground. See Fig 1 .
  3. Connect a jumper wire between ignition timing adjustment connector and vehicle ground. See IGNITION TIMING ADJUSTMENT CONNECTOR LOCATION  table under IGNITION TIMING.
  4. Start and run engine at idle. Check basic idle speed. See IDLE SPEED SPECIFICATIONS  table. If idle speed is not within specification, turn engine speed adjusting screw until correct engine speed is obtained. See Fig 2 . Access to speed adjusting screw is obtained by removing rubber plug on throttle body.
  5. If idle speed cannot be lowered by turning engine speed adjusting screw, determine if fixed speed adjusting screw (stop screw contacting throttle lever) has been adjusted. See FIXED SPEED ADJUSTING SCREW  for procedure.
  6. After all adjustments are verified to be correct, possible cause of incorrect idle speed is deterioration of fast idle air control motor. Throttle valve must be replaced to correct symptom. Disconnect jumper wires and recheck idle speed.
    TACHOMETER CONNECTOR LOCATION

    Application Type Location
    Diamante 1- Or 3-Pin (1)
    Stealth & 3000GT 1- Or 3-Pin (2)
    (1) On DOHC, 1-pin Blue connector is attached to main harness on center of firewall. On SOHC, 3-pin connector (White/Blue wire) is mounted to ignition coil bracket and must be backprobed.
    (2) On Stealth SOHC, DO NOT  disconnect noise filter connector. Backprobe double wire portion of connector behind intake plenum, near ignition coil. On DOHC, 1-pin Blue connector below wiper motor.
    IDLE SPEED SPECIFICATIONS

    Application Curb Idle Basic Idle
    Diamante, Stealth & 3000GT 600-800 650-750
    Fig 1: Locating Data Link Connector (Diamante, Stealth & 3000GT)
    G95G31027Courtesy of MITSUBISHI MOTOR SALES OF AMERICA
    Fig 2: Adjusting Idle Speed (Diamante, Stealth & 3000GT)
    G93F78134Courtesy of MITSUBISHI MOTOR SALES OF AMERICA
scientia non olet · About LEMON Manuals