Idle Speed

WARNING: This page is about a different car, the 1995 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.

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). DO NOT adjust idle using throttle adjusting screw. Throttle adjusting screw is preset and if adjusted, will adversely affect engine performance.

NOTE: On Miata, use Blue 1-pin connector located in right front corner of engine compartment 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 data link connector. Set SYSTEM SELECT to position 1 and TEST SWITCH to SELF-TEST, or connect jumper wire between data link connector terminals TEN and GND. See Figure .
Connect tachometer to data link connector terminal IG (-). If idle speed is not within specification, rotate air adjusting screw on throttle body. See IDLE SPEED SPECIFICATIONS table. Disconnect diagnostic tester or jumper wire from data link connector.

IDLE SPEED SPECIFICATIONS

Application

M/T RPM

⁽¹⁾ A/T RPM

Miata ⁽²⁾

850

800

⁽¹⁾	Place automatic transmission in Park.

⁽²⁾	Connect jumper wire between terminals TEN and GRD of data link connector.