Acura Coupes and Sedans 1986-1993 Repair Guide

Adjustments

Print

IDLE SPEED ADJUSTMENT



Idle is not adjusted at the throttle plate stop screw. That screw is set at the factory and is not adjustable. All idle adjustments are made by turning the idle adjusting screw on the throttle body. All idle tests must be met and the idle must remain stable under all test conditions.

1986-1990 Legend
  1. Start engine and warm up to normal operating temperature; the cooling fan must come on at least once.
  2.  
  3. Connect a tachometer.
  4.  
  5. Set the steering wheel in the straight-ahead or no load condition. Make certain all electrical accessories are turned OFF ; check the idle speed. Correct idle speed is 680 plus or minus 50 rpm with the transaxle in P or N .
  6.  
  7. Check the ECU under the front passenger seat. If the yellow LED is not lit, the idle speed is correct and no adjustment is needed. If the yellow LED is blinking, adjust the idle speed adjusting screw 1 / 4 turn clockwise. If the yellow LED is lit constantly-not flashing-turn the idle adjusting screw 1 / 4 turn counter-clockwise.
  8.  
  9. Once adjusted, the yellow LED should turn off within 30 seconds. If it does not, turn the idle adjuster another 1 / 4 turn, continuing at 30 second intervals until the LED goes out.
  10.  
  11. Check the idle under each of the following conditions individually. Idle speed should remain stable at 680 plus or minus 50 rpm under each condition: High beam headlights and rear window defogger ON ; steering wheel turned sharply; air conditioner compressor engaged; automatic transaxle in a drive gear.
  12.  

1991-93 Legend

See Figures 1 and 2

  1. Start engine and warm up to normal operating temperature; the cooling fan must come on at least once. Switch the ignition OFF .
  2.  
  3. Connect a tachometer.
  4.  
  5. Disconnect the 2-pin connector on the EACV.
  6.  
  7. Start the engine with the accelerator pedal slightly depressed. Use the pedal to stabilize the engine speed at 1000 rpm. Slowly release the throttle until the engine idles. Check the idle with air conditioning, cooling fan and all electrical loads OFF .
  8.  
  9. The idle should be 450 plus or minus 50 rpm for manual vehicles and 480 plus or minus 50 rpm for automatic vehicles.
  10.  
  11. If the rpm is not within specifications, adjust as needed by turning the idle adjusting screw on the throttle body.
  12.  
  13. Switch the ignition OFF . Reconnect the connector to the EACV, then clear the ECU by removing the No. 15 fuse in the underdash fuse box for at least 10 seconds.
  14.  
  15. Restart the engine, allowing it to idle in N or P for 1 minute. With all electrical loads including the air conditioning and cooling fan OFF , idle speed should be 650 plus or minus 50 rpm for manual vehicles and 600 plus or minus 50 for automatic vehicles.
  16.  



Click image to see an enlarged view

Fig. Fig. 1: Idle speed adjustment-Integra



Click image to see an enlarged view

Fig. Fig. 2: Idle speed adjustment-Legend

Integra
  1. Apply the parking brake. Start engine and warm up to normal operating temperature; the cooling fan must come on at least once.
  2.  
  3. Connect a tachometer.
  4.  
  5. Disconnect the 2-pin connector on the EACV.
  6.  
  7. Check the idle with the transaxle in N or P and the air conditioning, cooling fan and all electrical loads OFF .
  8.  
  9. The idle should be 650 plus or minus 50 rpm.
  10.  
  11. If the rpm is not within specifications, adjust as needed by turning the idle adjusting screw on the throttle body. If the idle speed is excessively high, check the throttle control system.
  12.  
  13. Switch the ignition OFF . Reconnect the connector to the EACV, then clear the ECU by removing the BACK UP (Canadian: HAZARD, BACK-UP) fuse in the underhood relay box for at least 10 seconds.
  14.  
  15. Restart the engine, allowing it to idle. With all electrical loads including the air conditioning and cooling fan OFF , idle speed should be 750 plus or minus 50 rpm with the transaxle in P or N .
  16.  
  17. Allow the engine to idle for 1 minute with the headlight high beams and rear defogger ON . The idle speed should be 750 plus or minus 50 rpm.
  18.  
  19. Switch the air conditioner ON and the blower fan to HI . After 1 minute, the idle should be 750 plus or minus 50 rpm.
  20.  
  21. If the idle speed is out of specification, refer to the system troubleshooting charts in Driveability & Emissions Controls of this repair guide.
  22.  

Vigor

See Figure 3



Click image to see an enlarged view

Fig. Fig. 3: Idle speed adjustment-Vigor

  1. Start engine and warm up to normal operating temperature; the cooling fan must come on at least once. Switch the ignition OFF .
  2.  
  3. Connect a tachometer.
  4.  
  5. Disconnect the 2-pin connector on the EACV.
  6.  
  7. Start the engine with the accelerator pedal slightly depressed. Use the pedal to stabilize the engine speed at 1000 rpm. Slowly release the throttle until the engine idles. Check the idle with air conditioning, cooling fan and all electrical loads OFF .
  8.  
  9. The idle should be 550 plus or minus 50 rpm with the vehicle in P or N .
  10.  
  11. If the rpm is not within specifications, adjust as needed by turning the idle adjusting screw on the throttle body.
  12.  
  13. Switch the ignition OFF . Reconnect the connector to the EACV, then clear the ECU by removing the BACK UP fuse in the underhood fuse box for at least 10 seconds.
  14.  
  15. Restart the engine, allowing it to idle in N or P for 1 minute. With all electrical loads including the air conditioning and cooling fan OFF , idle speed should be 700 plus or minus 50 rpm.
  16.  
  17. Allow the engine to idle for 1 minute with the headlight high beams and rear defogger ON . The idle speed should be 770 plus or minus 50 rpm.
  18.  
  19. Turn the headlights and defogger OFF. Switch the air conditioner ON and the blower fan to HI . After 1 minute, the idle should be 770 plus or minus 50 rpm.
  20.  

 
label.common.footer.alt.autozoneLogo