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Home >> Subaru >> 2003 >> Baja Automatic >> Repair and Diagnosis >> Engine Performance >> Engine Controls - On-Vehicle Adjustments >> Idle Speed >> Notes
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Idle Speed: Notes

  1. Before checking the idle speed, check the following:
    • Ensure the air cleaner element is free from clogging
    • Ignition timing is correct.
    • Spark plugs are in good condition.
    • Check that hoses are connected properly.
    • Ensure the Malfunction Indicator Light (MIL - CHECK ENGINE light) does not illuminate.
  2. Warm the engine.
  3. Stop the engine, and turn the ignition switch to "OFF".
  4. When using the Subaru Select Monitor; insert the cartridge to the Subaru Select Monitor. Connect the Subaru Select Monitor to the data link connector on the left side of the dash, under the hood release lever. Turn the ignition switch to "ON", and Subaru Select Monitor switch to "ON". Select "2. Each System Check" in Main Menu. Select "Engine Control System" in Selection Menu. Select "1. Current Data Display & Save" in Engine Control System Diagnosis. Select "1.12 Data Display" in Data Display Menu. Start the engine, and read engine idle speed.
    5. NOTE: When using general scan tool, carefully read its operation manual. This ignition system provides simultaneous ignition for No. 1 and No. 2 plugs. It must be noted that some tachometers may register twice that of actual engine speed.
  5. When using the tachometer (Secondary pick-up type); attach the pick-up clip to No. 1 cylinder spark plug cord. See Fig 1 . Start the engine, and read engine idle speed.
  6. Check the idle speed when unloaded. (With headlights, heater fan, rear defroster, radiator fan, air conditioning, etc. "OFF").
    7. CAUTION: Never rotate the idle adjusting screw. If the idle speed is out of specifications, see IDLE SPEED SPECIFICATIONS  table and appropriate BASIC DIAGNOSTICS PROCEDURES article.
  7. Check the idle speed when loaded. Turn the air conditioning switch to "ON" and operate the compressor for at least one minute before measurement.
IDLE SPEED SPECIFICATIONS

Application RPM
2.0L
With A/C On
A/T 675-975
M/T 650-950
With A/C Off 650-850
2.5L
With A/C On 750-950
With A/C Off
A/T 600-800
M/T 550-750
3.0L
With A/C On 650-750
With A/C Off 550-650
Fig 1: Attaching Tachometer Pick-Up Clip to No. 1 Cylinder Spark Plug Cord
G00166666Courtesy of SUBARU OF AMERICA, INC.
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