Prelude L4-1958cc DOHC (1989)
Idle Speed: Adjustments
Idle Speed
IDLE SPEED
Fig. 91 Electronic Air Control Valve (EACV) Location
1.
Start the engine and let it warm up to normal operating temperature (the cooling fan comes on).
2.
Connect a tachometer.
3.
Disconnect the 2P connector from the EACV.
4.
Set the steering in the straight forward position, check the idle speed in the no load condition, with the headlights, cooling fan, and all accessaries
are OFF.
Idle Speed Should Be:
Manual: 650 ± 50 rpm
Automatic: 650 ± 50 rpm (in "N" or "P")
Adjust the idle speed by turning the adjusting screw on top of the throttle body.
Fig. 92 Idle Speed Adjusting Screw Location
5.
Reconnect the 2P connector to the EACV, turn the ignition switch OFF, remove the CLOCK (10 Amp) fuse in the underhood relay box for 10
seconds to reset the ECU.
6.
Set the steering in the straight forward position and check the idle speed in the no load conditions in which the headlights, blower fan, rear