Idle Speed
- Ensure air filter is clean, vacuum hoses are properly routed and connected, spark plugs are in good condition and timing is at specification. See IGNITION TIMING
. Verify malfunction indicator lamp (MIL) is not illuminated. Warm engine to normal operating temperature. Turn ignition off. Connect scan tool or tachometer (secondary pick-up type) following manufacturer's instructions.NOTE: Because spark plugs No. 1 and 2 fire simultaneously, some tachometers may register twice actual engine speed.
- Start and idle engine. Check idle speed with accessories off, then with A/C on. See IDLE SPEED SPECIFICATIONS table. If idle speed is not as specified, check self-diagnostic system for DTC(s). Repair as necessary. See TESTS W/CODES article in this section.
IDLE SPEED SPECIFICATIONS
| Application | RPM | |
|---|---|---|
| Forester | ||
| With A/C Off | 650-750 | |
| With A/C On | 800-900 | |
| Impreza | ||
| With A/C Off | 600-800 | |
| With A/C On | 750-850 | |
| Legacy | ||
| With A/C Off | 600-800 | |
| With A/C On | 800-900 | |