Subaru Car 1998-05

Adjustments

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Idle Speed



Idle speed is maintained by the Powertrain Control Module (PCM). No adjustment is necessary or possible.

1.8L Engine


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Fig. Idle adjustment screw-1.8L engine

  1. Position gear selector lever in the N position on vehicles equipped with manual transaxles, and in the P position on vehicles equipped with automatic transaxles.
  2.  
  3. Connect a tachometer according to the manufacturer's instructions. Start the engine and allow it to reach normal operating temperature.
  4.  
  5. Check and adjust the ignition timing to specification.
  6.  
  7. Check and make sure all vacuum hoses, blow-by hoses, rocker cover, oil filler cap and oil filter are secure.
  8.  
  9. Increase engine speed to 2500 rpm for 1 minute to heat the oxygen sensor.
  10.  
  11. Disconnect and plug the purge hose leading to the throttle body.
  12.  
  13. Disconnect the air control valve electrical connector from the throttle body.
  14.  
  15. Inspect the auxiliary air control valve attached to the intake manifold, and make sure it is closed.
  16.  
  17. Access the idle adjusting screw located at the side of the throttle body and rotate to adjust the idle.
  18.  
  19. When complete, connect all hoses plugged earlier.
  20.  
  21. Remove the tachometer.
  22.  

2.5L & 3.3L Engines
  1. Position gear selector lever in the N position on vehicles equipped with manual transaxles, and in the P position on vehicles equipped with automatic transaxles.
  2.  
  3. Check and make sure the ignition timing is correct, the spark plugs are gapped correctly and in good condition, and the air filter is clean.
  4.  
  5. Inspect all vacuum hoses for any leaks, and repair if needed.
  6.  
  7. Check and make sure the CHECK ENGINE light does not illuminate.
  8.  
  9. Connect the Subaru select monitor to the harness located under the left side of the dash. When connected use mode F04 for this procedure.
    WARNING
    When connecting the Subaru select monitor, make sure the ignition is OFF, or damage could occur to the monitor and or ignition components.

  10.  
  11. With all accessories OFF , check the idle speed. The idle range should be 600-800 rpm.
  12.  
  13. Check the idle speed when loaded by turning ON the headlights, rear defroster and A/C. The idle range should be 800-900 rpm. If not, diagnose and correct the problem in the fast idle control device (FICD) system.
    WARNING
    If the idle speed is not within specification range, DO NOT turn the idle adjusting screw. If repairs to the FICD do not restore the idle to specification, consult an authorized dealer for additional repairs.

  14.  
  15. Disconnect the test mode connector.
  16.  

 
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