Idle Speed

Place transaxle in Park (A/T) or Neutral (M/T), and apply parking brake. Ensure throttle cable has at least .12-.20" (3.1-5.1 mm) of slack in cable. Adjust throttle cable slack (if necessary).
Ensure all emission hoses and air cleaner are properly installed. Ensure ignition timing is within specification. See IGNITION TIMING . Ensure all accessories are off. Start engine and warm to normal operating temperature. Connect scan tester to Data Link Connector (DLC). Ensure idle speed is within specification. See the IDLE SPEED SPECIFICATIONS table.
If idle speed requires adjustment, remove cover from idle speed adjusting screw. Turn idle speed adjusting screw inward to increase idle speed or outward to decrease idle speed. See Fig 1 .
On A/C-equipped models, turn A/C to low speed. With A/C operating, idle speed should be within specification. See A/C IDLE SPEED SPECIFICATIONS table.
If idle speed requires adjustment, rotate adjustment screw on A/C Vacuum Switching Valve (VSV) to obtain correct idle speed. See Fig 1 . A/C VSV is mounted on firewall, right of ignition coil.
Turn engine off. Install idle speed adjusting screw cover (if removed), and remove scan tester.

Fig 1: Adjusting Idle Speed

Courtesy of GENERAL MOTORS CORP.

IDLE SPEED SPECIFICATIONS⁽¹⁾

Application

Idle RPM

Convertible

⁽²⁾ 800-900

A/T

⁽²⁾ 800-900

M/T

⁽²⁾ 750-850

Metro XFi (M/T)

⁽²⁾ 650-750

⁽¹⁾	If specification differs from emission label, use specification listed on emission label.

⁽²⁾	With transaxle/transmission in Neutral (M/T) or Park (A/T).

A/C IDLE SPEED SPECIFICATIONS

Application

⁽¹⁾ Engine RPM

Metro ⁽²⁾

850-950

⁽¹⁾	Transaxle/transmission in Neutral (M/T) or in Park (A/T).

⁽²⁾	Vacuum Switching Valve (VSV) is used for maintaining idle speed during A/C operation.