Idle Speed
NOTE:
DO NOT
adjust idle speed in areas above 8200 ft. elevation.
- Idle speed is controlled by ECM using an IAC valve and requires no adjustments under normal conditions. If conditions require idle speed to be adjusted, start engine and warm it to operating temperature. Turn all accessories off.
- Ensure all fuel and emission control system wire connectors and hoses are properly connected. Ensure accelerator cable has free-play, air cleaner and ducts are properly installed and air filter element is in good condition. Ensure ignition timing is correct.
- Locate monitor coupler beside battery in relay box. Using a jumper wire, ground terminal "B". See Figure
. MIL (CHECK ENGINE light) should indicate Code 12. Attach duty meter to terminals "C" and "D" of monitor coupler connector. Remove cap and turn idle speed adjusting screw to obtain correct idle speed. See Figure
. See the IDLE SPEED SPECIFICATIONS and IAC DUTY AT SPECIFIED IDLE SPEED tables. On vehicles with A/C, verify idle speed is 850-950 RPM with A/C on. If idle speed with A/C on is not within specification check operation of Idle Air Control (IAC) valve. See the SYSTEM/COMPONENT TESTS
article.
IDLE SPEED SPECIFICATIONS
| Application |
Idle RPM |
| With A/C Off |
| Auto. Transaxle |
750-850 |
| Man. Transaxle |
700-800 |
| With A/C On |
850-950 |
IAC DUTY AT SPECIFIED IDLE SPEED
| Application |
Percent |
| Esteem |
30 |