MINIMUM IDLE SPEED ADJUSTMENT
- Check controlled idle speed and perform IAC system check first. Refer to «CONTROLLED IDLE SPEED CHECK»(ref-20056-S19816787192001010200000) . Set parking brake and block drive wheels. Start engine and operate to normal operating temperature of about 185-212°F (85-100°C). Turn engine off.
- Remove air cleaner, adapter and gaskets. Ensure throttle lever is not binding TV cable or cruise control cable. At Diagnostic Link Connector (DLC), ground the White/Black wire terminal (upper row, second terminal from right end). Turn ignition on (engine off). Wait for at least 10 seconds (this allows IAC pintle to extend and seat in throttle body).
- Disconnect IAC valve harness connector. Remove jumper from DLC. Connect scan tester to DLC. Put scan tester into OPEN mode. Place transmission in Neutral. Start engine. Allow engine RPM to stabilize. Check engine RPM. See «MINIMUM IDLE SPEED»(ref-20056-S23931914662001010200000) . Disregard IAC count on scan tester while IAC valve is disconnected.
- If idle speed is not as specified, remove stop screw plug by using an awl. With engine at normal operating temperature, adjust stop screw to obtain nominal RPM with seated IAC valve. Turn ignition off. Reconnect IAC harness connector. Disconnect scan tester. Reseal stop screw hole and reinstall air cleaner assembly.
- Reset IAC valve as follows: Turn ignition on (engine off) for 5 seconds. Turn ignition off for 10 seconds. Start engine. If engine does not idle correctly, repeat procedure.
| Application | RPM |
|---|
| Auto. Trans. (In Drive) | 600-650 |
| Manual Trans. (In Neutral) | 675-725 |
| (1) If engine has less than 500 miles or if checking idle speed at altitudes above 1500 feet, idle speed with seated IAC is lower than specified. |
| (1) | If engine has less than 500 miles or if checking idle speed at altitudes above 1500 feet, idle speed with seated IAC is lower than specified. |
