Idle Speed
NOTE:
Before adjusting idle speed, warm engine to normal operating temperature. Turn off all accessories. Place transmission in Neutral (M/T) or Park (A/T). Ensure ignition timing is adjusted. See IGNITION TIMING
.
NOTE:
On Miata, use Blue 1-pin connector near airflow meter as a source of battery power for positive lead of tachometer or timing light (battery is in trunk). DO NOT ground this connector, or 20-amp WIPER fuse will blow.
- Connect Diagnostic Tester (49 B019 9A0) to diagnostic connector and select SELF-TEST mode, or connect jumper wire between diagnostic connector terminals TEN and GND. See Figure . Connect tachometer to diagnostic connector terminal IG (-).
- If idle speed is not within specification, rotate idle air adjusting screw on throttle body. See IDLE SPEED SPECIFICATIONS table. Disconnect jumper wire.
IDLE SPEED SPECIFICATIONS
| Application | M/T: RPM | (1) A/T: RPM | ||||||
|---|---|---|---|---|---|---|---|---|
| MX-3 (2) | ||||||||
| 1.6L | ||||||||
| A/T | 750 | 750 | ||||||
| M/T | 700 | 700 | ||||||
| 1.8L | 670 | 670 | ||||||
| Protege (2) | 750 | 750 | ||||||
| 323 (2) | 750 | 750 | ||||||
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